Journal Sciences News
The Surgeon
March 2018
Chemical looping epoxidation
Publication date: March 2018
Source:Journal of Catalysis, Volume 359 Author(s): Martin S.C. Chan, Ewa Marek, Stuart A. Scott, J.S. Dennis Chemical looping epoxidation of ethylene was demonstrated, whereby the sole oxidant was a solid oxygen carrier, 15
March 2018
Enhancing electrocatalytic CO2 reduction in solid oxide electrolysis cell with Ce0.9Mn0.1O2
March 2018
Hydrogen spillover enabled active Cu sites for methanol synthesis from CO2 hydrogenation over Pd doped CuZn catalysts
Publication date: March 2018
Source:Journal of Catalysis, Volume 359 Author(s): Bing Hu, Yazhi Yin, Guoliang Liu, Shengli Chen, Xinlin Hong, Shik Chi Edman Tsang Surface modification with Pd is an effective way for improved activity in CO2 hydrogenation to methanol over commercial Cu-ZnO catalysts via a so-called hydrogen spillover mechanism. However, there still lacks a quantitative analysis of hydrogen spillover effect and the nature of active sites after Pd modification remains unclear. In this work, we prepared a series of Pd-doped Cu-ZnO catalysts (Pd-CZ-x) with tunable Pd loading by using a facile polyol reduction method for a deep study of the promotion effect of Pd. With the increase of Pd/Cu molar ratio (x) from 0 to 0.04, there emerges a volcano-shaped relationship between methanol space time yield (STY) and Pd loading. 1% Pd doping can increase the methanol STY by 2.5 times and the methanol turnover frequency (TOF) by 3.5 times at 543
March 2018
Rational redesign of the active site of selenosubtilisin with strongly enhanced glutathione peroxidase activity
Publication date: March 2018
Source:Journal of Catalysis, Volume 359 Author(s): Tingting Wang, Jing Li, Jiayun Xu, Xiaotong Fan, Linlu Zhao, Shanpeng Qiao, Tiezheng Pan, Junqiu Liu The search for a perfect model to mimic the properties of the selenoenzyme glutathione peroxidase (GPx) has inspired great interest. Rational design and redesign of the structure–function relationship has become an indispensable technique. In this report, the active site of selenosubtilisin was successfully rebuilt by transferring the catalytically essential residue selenocysteine (Sec) to the edge of the substrate-binding pocket of the enzyme by artificial manipulation. Founding on computer-aided molecular simulation, the amino acid residue at position 63 (Ser in the wild-type enzyme) was selectively replaced with Sec using a cysteine auxotrophic expression system. The novel seleno63-subtilisin E gave a prominent 100-fold higher efficiency than the original seleno221-subtilisin E for GPx activity. Moreover, this seleno63-subtilisin E also had efficient hydrolase activity.

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February 2018
Functionalized hollow double-shelled polymeric nano-bowls as effective heterogeneous organocatalysts for enhanced catalytic activity in asymmetric Michael addition
Publication date: March 2018
Source:Journal of Catalysis, Volume 359 Author(s): Zhiwei Zhao, Dandan Feng, Guangxin Xie, Xuebing Ma A facile and robust strategy to fabricate organocatalyst-functionalized hollow double-shelled nano-bowl was developed for the first time by hard-templating synthesis. After the core was etched by DMF, the outer shell thicknesses below 50
February 2018
Editorial Board
Publication date: February 2018
Source:Journal of Catalysis, Volume 358

February 2018
Defect engineering of mesoporous nickel ferrite and its application for highly enhanced water oxidation catalysis
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Qiudi Yue, Cunming Liu, Yangyang Wan, Xiaojun Wu, Xiaoyi Zhang, Pingwu Du Spinel nickel ferrite (NiFe2O4) emerges as a promising low-cost catalyst for water splitting but it usually shows low catalytic activity because of its limited number of active sites and poor conductivity. For the first time, herein we have successfully overcome its weaknesses using defect engineering approach by creating oxygen vacancies in NiFe2O4. The existence of oxygen vacancy not only shifts up the d-band center, strengthens the adsorption of H2O, and thus provides more active catalytic sites, but also tunes the electron configuration and creates massive number of defective donor states in the band gap to facilitate charge transfer processes. The optimal defective catalyst showed significantly enhanced catalytic OER performance with an OER overpotential as low as 0.35
February 2018
First-principles mechanistic study of ring hydrogenation and deoxygenation reactions of eugenol over Ru(0001) catalysts
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Matej Hu
February 2018
The role of Pt-FexOy interfacial sites for CO oxidation
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Insoo Ro, Isaias B. Aragao, Joseph P. Chada, Yifei Liu, Keishla R. Rivera-Dones, Madelyn R. Ball, Daniela Zanchet, James A. Dumesic, George W. Huber Supported Pt catalysts with different Fe/Pt atomic ratios were synthesized using controlled surface reactions to deposit (cyclohexadiene) iron tricarbonyl onto Pt/SiO2 to create Pt-FexOy interfacial sites. X-ray photoelectron spectroscopy measurements show that Pt and Fe species exist as metallic Pt and Fe oxides phases, respectively, after treatment in H2 at 573
February 2018
In situ monitoring of the phenomenon of electrochemical promotion of catalysis
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): J.P. Espin
February 2018
Methane dry reforming reaction on Ru(0
February 2018
Suspending ionic single-atom catalysts in porphyrinic frameworks for highly efficient aerobic oxidation at room temperature
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Wei-Long He, Xiu-Li Yang, Min Zhao, Chuan-De Wu Room temperature and atmosphere pressure are highly desired catalytic conditions for aerobic oxidation of inert sp 3 CH bonds. To meet this challenge, we developed a simple strategy by suspending ionic single atoms (ISAs) inside the anionic pores of metal–organic frameworks (MOFs). CZJ-22-Cu, consisting of suspended ISA copper(II) inside the anionic pores, exhibits exceptionally high catalytic efficiency in aerobic oxidation of ethers to esters at room temperature and atmosphere pressure, in which turnover number (TON) 77,100 and turnover frequency (TOF) 7710
February 2018
Controlled deposition of titanium oxide overcoats by non-hydrolytic sol gel for improved catalyst selectivity and stability
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Florent H
February 2018
Internal field 59Co NMR study of cobalt-iron nanoparticles during the activation of CoFe2/CaO catalyst for carbon nanotube synthesis
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Andrey S. Andreev, Dmitry V. Krasnikov, Vladimir I. Zaikovskii, Svetlana V. Cherepanova, Mariya A. Kazakova, Olga B. Lapina, Vladimir L. Kuznetsov, Jean–Baptiste d'Espinose de Lacaillerie CoFe2/CaO catalysts for multi-walled carbon nanotubes (MWCNT) were characterized during the activation period (T
February 2018
Acidity enhanced [Al]MCM-41 via ultrasonic irradiation for the Beckmann rearrangement of cyclohexanone oxime to
February 2018
Quantification of acid site densities on zeolites in the presence of solvents via determination of extinction coefficients of adsorbed pyridine
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Nicholas S. Gould, Bingjun Xu Fourier transform infrared (FTIR) spectroscopy is frequently used to characterize properties of catalytic sites, identify reaction intermediates, and probe interactions between adsorbates and surfaces, making it a versatile tool for elucidating reaction mechanisms in heterogeneous catalysis. While this technique is typically regarded as qualitative or semiquantitative in nature, quantitative results can be obtained by determining integrated molar extinction coefficients (IMECs), or the amount of signal per mole of adsorbed or bulk species. IMECs for vibrational modes corresponding to pyridine adsorbed onto Br
February 2018
One-pot synthesis of ethylene glycol by oxidative hydration of ethylene with hydrogen peroxide over titanosilicate catalysts
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Xinqing Lu, Hao Xu, Jiaying Yan, Wen-Juan Zhou, Armin Liebens, Peng Wu The oxidative hydration of ethylene with aqueous hydrogen peroxide was investigated over various titanosilicate catalysts for the purpose of one-pot synthesis of ethylene glycol (EG). The effect of titanosilicate topology (Ti-MWW, TS-1, Ti-MCM-68 and Ti-MOR), solvent, Ti content, catalyst amount, H2O/H2O2 ratio, reaction temperature and time on the EG production have been studied in detail. The Ti-MWW/H2O2/H2O catalytic system showed the highest EG yield together with high H2O2 conversion and utilization efficiency for the oxidative hydration of ethylene. The mechanism for the titanosilicate-catalyzed hydration of ethylene oxide (EO) has also been considered, which then shed light on the active sites for the second step in the oxidative hydration of ethylene. The catalyst deactivation could be ascribed to that the target product of EG and other heavy by-products with high boiling points were deposited inside the channels. The used Ti-MWW can be reusable when subjected to the regeneration by high-temperature calcination. Amine-assisted structural rearrangement of Ti-MWW not only enhanced the catalytic activity but also improved its stability in the oxidative hydration of ethylene.

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February 2018
Understanding the incorporating effect of Co2+/Co3+ in NiFe-layered double hydroxide for electrocatalytic oxygen evolution reaction
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Yongmin Bi, Zhao Cai, Daojin Zhou, Yang Tian, Qian Zhang(m), Qian Zhang(f), Yun Kuang, Yaping Li, Xiaoming Sun, Xue Duan NiFe-layered double hydroxide (NiFe-LDH) has been widely accepted as promising catalyst candidates for the oxygen evolution reaction (OER). Recently, incorporating Co atoms in NiFe laminates has been recognized as an effective way to enhance the OER activity, but their roles have been rarely studied. Herein, density functional theory plus U (DFT
February 2018
Influence of gelation and calcination temperature on the structure-performance of porous VOX-SiO2 solids in non-oxidative propane dehydrogenation
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Ping Hu, Wan-Zhong Lang, Xi Yan, Lian-Feng Chu, Ya-Jun Guo VOX-doped porous SiO2 solids (VOX-SiO2) were synthesized at different gelation and calcination temperatures through an in-situ one-step synthesis and evaluated by non-oxidative propane dehydrogenation (PDH), exhibiting excellent catalytic performance. VOX-SiO2 catalysts were characterized by XRD, low-temperature N2 adsorption/desorption, SEM, TEM, UV–Vis, Raman, XPS, NH3-TPD, H2-TPR, and TGA. The structural and performance results for the catalysts reveal that gelation temperature has only a slight effect on the surface acidity, textural properties and VOX species dispersion of VOX-SiO2 catalysts within a reasonable temperature range (30–60
February 2018
Reforming of ethanol on Co/Al2O3 catalysts reduced at different temperatures
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Zs. Ferencz, E. Varga, R. Pusk
February 2018
Modeling the adsorption of sulfur containing molecules and their hydrodesulfurization intermediates on the Co-promoted MoS2 catalyst by DFT
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Manuel
February 2018
Photocatalytic degradation of ciprofloxacin by a novel Z-scheme CeO2–Ag/AgBr photocatalyst: Influencing factors, possible degradation pathways, and mechanism insight
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Xiao-Ju Wen, Cheng-Gang Niu, Lei Zhang, Chao Liang, Hai Guo, Guang-Ming Zeng In this study, CeO2–Ag/AgBr composite photocatalysts with a Z-scheme configuration were fabricated by in situ interspersal of AgBr on CeO2 and subsequent photoreduction process. The CeO2–Ag/AgBr composites exhibited enhanced photocatalytic activity for the photodegradation of ciprofloxacin (CIP) under visible light irradiation. The effects of initial CIP concentration and various inorganic salts were investigated in detail. Three-dimensional excitation–emission matrix fluorescence spectra were used to further monitor the CIP molecule degradation. Plausible degradation pathways for CIP were proposed based on LC-MS instruments. Photoluminescence, electrochemical impedance spectroscopy, and photocurrent tests indicated the rapid transfer and migration of electrons–holes can be achieved in this ternary photocatalytic system. The enhanced photocatalytic performances of CeO2–Ag/AgBr could be credited to the accelerated interfacial charge transfer process and the improved separation of the photogenerated electron–hole pairs. The existence of a small amount of metallic Ag is conducive to the formation of a stable Z-scheme photocatalytic system. This work would pave the route for the design of novel Z-scheme photocatalytic systems for application in solar-to-fuel conversion and photocatalytic water treatment.

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February 2018
Efficient hydrodesulfurization catalysts derived from Strandberg PMoNi polyoxometalates
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Jilei Liang, Mengmeng Wu, Pinghe Wei, Jinchong Zhao, Hua Huang, Cunfu Li, Yukun Lu, Yunqi Liu, Chenguang Liu Highly active hydrodesulfurization (HDS) catalysts have been prepared successfully through a molecular approach using well-defined Strandberg PMoNi polyoxometalates (POMs) as superior precursors. The hand-picked POMs significantly facilitated not only the formation of highly dispersed NiMo species but also the formation of abundant and accessible NiMoS active sites at lower sulfidation temperatures, thereby resulting in a remarkable activity improvement in comparison with reference catalysts prepared with conventional precursors. Characterization results revealed the multidirecting effects of the POMs component and structure on the morphology and composition of the species in the NiMoS active phase and the evolution of precursors during the catalyst preparation simultaneously. The bottom-up POMs-based preparation methodology provides a better understanding of HDS catalyst structure and performance, thus further shedding light on the rational design and controllable fabrication of efficient HDS catalysts.

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February 2018
LaFe0.9Ni0.1O3 perovskite catalyst with enhanced activity and coke-resistance for dry reforming of ethane
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Baohuai Zhao, Binhang Yan, Siyu Yao, Zhenhua Xie, Qiyuan Wu, Rui Ran, Duan Weng, Cheng Zhang, Jingguang G. Chen A LaFe0.9Ni0.1O3 perovskite catalyst was evaluated for dry reforming of ethane (DRE), with two conventional oxide supported Ni catalysts (Ni/La2O3 and NiFe/La2O3) being used as references. LaFe0.9Ni0.1O3 showed the best activity and high coke-/sintering-resistance. TEM, TGA, and Raman characterizations confirmed that the deactivation of Ni/La2O3 was owing to the growth of Ni particles and the accumulation of coke, although the formation of La2O2CO3 was able to remove part of the coke during the reaction. The introduction of Fe-related species inhibited the coke formation while decreased the activity due to the loss of active sites. A portion of Ni ions in the perovskite lattice could be reduced to form highly dispersed and stable Ni nanoparticles on the surface during the reaction and oxygen vacancies were left in the perovskite lattice. Pulse reactor studies revealed that the oxygen vacancies in the perovskite could facilitate the activation and dissociation of CO2 to form CO and reactive oxygen species. Moreover, C2H6 was activated with the assistance of oxygen from the surface or subsurface of LaFe0.9Ni0.1O3 to form CO, rather than directly dissociated to surface carbon species as observed over Ni/La2O3.

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February 2018
Activation of oxygen on (NH3CuNH3)+ in NH3-SCR over Cu-CHA
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Lin Chen, Hanne Falsig, Ton V.W. Janssens, Henrik Gr
February 2018
Exploring bulk and colloidal Mg/Al hydrotalcite–Au nanoparticles hybrid materials in aerobic olefin epoxidation
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): S
February 2018
Catalytic N2O decomposition and reduction by NH3 over Fe/Beta and Fe/SSZ-13 catalysts
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Aiyong Wang, Yilin Wang, Eric D. Walter, Ravi K. Kukkadapu, Yanglong Guo, Guanzhong Lu, Robert S. Weber, Yong Wang, Charles H.F. Peden, Feng Gao Fe/zeolites are important N2O abatement catalysts, efficient in direct N2O decomposition and (selective) catalytic N2O reduction. In this study, Fe/Beta and Fe/SSZ-13 materials were synthesized via solution ion-exchange and used to catalyze these two reactions. The nature of the Fe species was probed with UV–vis, M
February 2018
Photocatalytic degradation of levofloxacin by ternary Ag2CO3/CeO2/AgBr photocatalyst under visible-light irradiation: Degradation pathways, mineralization ability, and an accelerated interfacial charge transfer process study
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Xiao-Ju Wen, Cheng-Gang Niu, Hai Guo, Lei Zhang, Chao Liang, Guang-Ming Zeng Construction of highly efficient ternary photocatalytic systems is strongly attracting the attention of researchers. In this study, a novel ternary Ag2CO3/CeO2/AgBr photocatalyst with a double Z-scheme configuration was fabricated by in situ loading of Ag2CO3 onto CeO2 spindles and subsequently via an acid corrosion process. The ternary Ag2CO3/CeO2/AgBr composites exhibited enhanced photocatalytic activity for the photodegradation of levofloxacin (LVF) under visible light irradiation. Three-dimensional excitation–emission matrix fluorescence spectra revealed that the structure of LVF could be destroyed from the fluorescence point of view; liquid chromatograph–mass spectrometer tests indicated that LVF can be degraded via different pathways; a total organic carbon study showed that LVF could be effectively mineralized. Transient photocurrent response, photoluminescence, and electrochemical impedance spectroscopy indicated that ternary Ag2CO3/CeO2/AgBr composites had fast photoinduced charge separation efficiency. Active-species-trapping experiments and an electron spin resonance technique confirmed that h+, O2
February 2018
Combining XPS and ToF-SIMS for assessing the CO oxidation activity of Au/TiO2 catalysts
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Sergey Chenakin, Norbert Kruse Au/TiO2 catalysts were produced by deposition-precipitation using different preparation conditions. Emphasis was laid on producing TiO2 supports via oxalate precursors in the presence or absence of alkali and/or alkali-earth elements to vary on purpose the catalysts’ morphological state, surface composition and electronic structure. The home-made catalysts and a commercial Au/TiO2 were analyzed in a comparative manner by mainly X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) to identify the key parameters responsible for their high activity in the CO oxidation at room temperature. Among these parameters, which were strongly influenced by the catalyst preparation conditions, the abundance of reduced Ti3+ species was ascertained to be overarching along with the availability of negatively charged Au nanoparticles. The abundance of O 2p bonding orbitals in the valence band of TiO2, which was modified by the presence of Au particles, and the extent of the support hydroxylation were also found to have a positive effect on the reaction rate. We further demonstrate that it is the specific area occupied by gold particles on the support surface that has to be taken into account to establish a reliable dependence of the reaction rate on the XPS-derived Au/Ti atomic ratio. All these factors have to be considered when assessing the activity performance of Au/TiO2 catalysts prepared and activated according to different recipes. After-reaction studies, which were also performed with a selected home-made catalyst, show that a slight decrease in its catalytic activity with time-on-stream can be mainly attributed to an appreciable accumulation of various carbon-containing species on the support surface along with a loss of OH groups. In summary, we show that combined XPS/ToF-SIMS studies provide a reliable guide for tailoring the preparation of high-performance Au-supported catalysts.

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February 2018
Fe-doped NiO mesoporous nanosheets array for highly efficient overall water splitting
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Zhengcui Wu, Zexian Zou, Jiansong Huang, Feng Gao Great efforts in developing bifunctional water splitting electrocatalysts are to construct catalytic materials with new and optimized chemical compositions and structures for enhancing efficiency of both anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER). In this work, the Fe-doped NiO mesoporous nanosheets array on Ni foam with different Fe dopant content (Fex%-NiO/NF) was synthesized by a facile solvothermal synthesis in mixed solvents of deionized water and methanol and subsequent anneal in air. The well-connected three-dimensional mesoporous nanosheets array structure offers a large number of catalytically active sites and buffers the large volume change during the electrochemical process of OER and HER. More importantly, the doped Fe3+ ions modified atomic and electronic structure of NiO by activated Ni centers through a Fe-induced partial-charge-transfer process which can promote the electrocatalytic performances of NiO for OER and HER. As a result, the optimized Fe11%-NiO/NF electrode exhibited excellent OER activity with a small overpotential of 206
February 2018
Regeneration of sulfur-poisoned Pd-based catalyst for natural gas oxidation
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Mari Honkanen, Jianguang Wang, Marja K
February 2018
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February 2018
Nature of SO3 poisoning on Cu/SAPO-34 SCR catalysts
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Meiqing Shen, Yun Zhang, Jianqiang Wang, Chen Wang, Jun Wang To reveal the nature of SO3 poisoning of Cu/SAPO-34 selective catalytic reduction (SCR) catalysts, CHA structure, copper species, and NO x conversion were probed. The Cu/SAPO-34 catalyst was treated with different ratios of SO3 to SO x (0, 6, 13, and 20%) at 250
February 2018
PtIr/Ti4O7 as a bifunctional electrocatalyst for improved oxygen reduction and oxygen evolution reactions
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Ji-Eun Won, Da-Hee Kwak, Sang-Beom Han, Hyun-Suk Park, Jin-Young Park, Kyeng-Bae Ma, Do-Hyoung Kim, Kyung-Won Park A unitized regenerative fuel cell (URFC) that combines a fuel cell with a water electrolyzer is attractive as a portable power source. To enhance the efficiency of the URFC, a bifunctional oxygen catalyst for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) needs to be developed. In this study, Ti4O7 supported Pt-based catalysts were prepared for a bifunctional oxygen catalyst (BOC) in URFC. Ti4O7 support was prepared using a low-temperature process with TiO2 and cobalt chloride hexahydrate at 950
February 2018
Effect of strain on the performance of iron-based catalyst in Fischer-Tropsch synthesis
Publication date: February 2018
Source:Journal of Catalysis, Volume 358 Author(s): Yingying Xue, Hui Ge, Zheng Chen, Yongbiao Zhai, Juan Zhang, Jiaqiang Sun, Mohamed Abbas, Ke Lin, Wentao Zhao, Jiangang Chen The role of strain on metal catalysis has been widely investigated by theoretical calculations. It is hard to prove by direct experimental strategies. In this work, we show how the strain can be adjusted experimentally to modulate Fischer-Tropsch synthesis (FTS) activity. The strain value is derived from the X-ray diffraction (XRD) line broadening method. The d-band occupancy (nd) is calculated semi-quantitatively by magnetic characterization on a vibrating sample magnetometer (VSM). A volcano curve is correlated between strain and FTS activity. The combination of physical property such as mechanics, magnetization, hardness and density functional theory (DFT) calculations is proposed to elucidate a general strain induced reactivity behavior. Such a strain dependent behavior is related to the variation in d-band electronic property of the metal.

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February 2018
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Publication date: February 2018
Source:Journal of Catalysis, Volume 358

February 2018
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Publication date: February 2018
Source:Journal of Catalysis, Volume 358

Available online 12 January 2018
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Publication date: February 2018
Source:Journal of Catalysis, Volume 358

January 2018
Chlorinated volatile organic compound oxidation over SO42
January 2018
Editorial Board
Publication date: January 2018
Source:Journal of Catalysis, Volume 357

January 2018
Reaction intermediates and mechanism of the zeolite-catalyzed transalkylation of 1,2,4-trimethylbenzene with toluene
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Seung Hyeok Cha, Suk Bong Hong We report the catalytic properties of a series of large-pore (H-Y, H-beta, H-mordenite, and H-UZM-35) and medium-pore (H-NU-87, H-TNU-9, and H-ZSM-5) zeolites with different framework structures for the transalkylation of 1,2,4-trimethylbenzene (1,2,4-TMB) with toluene. H-NU-87 with intersecting 10- and 12-ring channels, but in which access to the inner part of the crystal can only occur through the 10-ring pores, was found to show a significantly higher xylene yield (40% vs. 23% at 673
January 2018
Planar model system of the Phillips (Cr/SiO2) catalyst based on a well-defined thin silicate film
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Qiushi Pan, Linfei Li, Shamil Shaikhutdinov, Hans-Joachim Freund The Phillips catalyst (Cr/SiO2) is successfully used in the large-scale production of polyethylene and has attracted a great interest in catalytic community over the last sixty years. However, the atomic structure of the active site(s) and the reaction mechanism remain controversial, in particular due to the structural complexity and surface heterogeneity of the amorphous silica. In this work, we used a well-defined, atomically flat silicate bilayer film grown on Ru(0001) as a support offering the opportunity to investigate mechanistic aspects at the atomic scale. To fabricate a planar Cr/SiO2 model system suitable for surface science studies, chromium was deposited using physical vapor deposition onto the hydroxylated silica film surface. Structural characterization and adsorption studies were performed by infrared reflection absorption spectroscopy (IRAS) and temperature programmed desorption (TPD). Hydroxyls groups seem to serve as anchoring cites to Cr ad-atoms. As monitored by IRAS, hydroxyls consumption correlated with the appearance of the new band at
January 2018
Single cobalt sites in mesoporous N-doped carbon matrix for selective catalytic hydrogenation of nitroarenes
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Xiaohui Sun, Alma I. Olivos-Suarez, Dmitrii Osadchii, Maria Jose Valero Romero, Freek Kapteijn, Jorge Gascon A supported cobalt catalyst with atomically dispersed Co-Nx sites (3.5
January 2018
Role of Br
January 2018
Visible-light-induced charge transfer pathway and photocatalysis mechanism on Bi semimetal@defective BiOBr hierarchical microspheres
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Xing'an Dong, Wendong Zhang, Yanjuan Sun, Jieyuan Li, Wanglai Cen, Zhihao Cui, Hongwei Huang, Fan Dong Charge transfer pathway and catalysis mechanism are two major issues in a specific catalytic reaction process. To further probe these two aspects of photocatalytic NO oxidation to address the environmental problem, Bi metal@defective BiOBr hierarchical microspheres were fabricated and used as a visible light photocatalyst. The interfacial and surface properties of Bi metal@defective BiOBr were optimized to understand the SPR effect of Bi metal and the oxygen vacancies (OVs) formed in situ. It was found that the charge transfer pathway on Bi metal@defective BiOBr has been significantly changed from that on pristine BiOBr. The Bi semimetal could act both as a charge transfer bridge and as a hot electron donor. The OVs induced the formation of an intermediate level in the band structure of BiOBr and promote O2 activation and thus the generation of O2
January 2018
Selective charge transfer to dioxygen on KPF6-modified carbon nitride for photocatalytic synthesis of H2O2 under visible light
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Sujeong Kim, Gun-hee Moon, Hyejin Kim, Yeongdong Mun, Peng Zhang, Jinwoo Lee, Wonyong Choi Photochemical production of H2O2 through O2 reduction has been proposed as an alternative method of solar energy storage. A carbon nitride (CN) photocatalyst was selected for this purpose. The incorporation of KPF6 into the CN structure greatly enhanced the apparent quantum yield (AQY) of H2O2 production in the UV and visible light region. The AQY of KPF6-modified CN was measured to be 35.9% and 24.3% under monochromatic irradiation at 370 and 420
January 2018
Photo-assisted selective catalytic reduction of NO by Z-scheme natural clay based photocatalyst: Insight into the effect of graphene coupling
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Xiazhang Li, Xiangyu Yan, Xiaowang Lu, Shixiang Zuo, Zhongyu Li, Chao Yao, Chaoying Ni Photo-assisted selective catalytic reduction (photo-SCR) has been recognized as a promising strategy for NOx removal in recent decade, however rational designing of efficient and low-cost catalyst for photo-SCR remains to be a challenge. In the present work, natural one-dimension attapulgite (ATP) clay was initially coated with perovskite oxides by sol–gel method, and then coupled with reduced graphene oxide (rGO) by electrostatic assembly. XRD, TEM, Raman, UV–Vis, XPS, NH3-TPD, H2-TPR and in situ EPR were employed to characterize the products. Results indicated that the framework was coherently integrated by ATP skeleton, LaCoO3 particles and rGO nanosheet, while rGO behaved as excellent electronic transmission mediator between ATP and LaCoO3 to achieve indirect Z-scheme system, thus significantly improved the charge-separation efficiency and redox ability of the nanocomposite. In situ EPR revealed that the photogenerated holes in the catalysts were captured by NH3 to produce NH2 radical, which produced NH2NO intermediate followed by decomposing into N2 and H2O. Photo-SCR of NO was performed using LaCoO3/ATP/rGO as catalyst under simulated solar-light irradiation. Results indicated that the introduction amount of rGO had critical effect on the NO conversion efficiency, which reached as high as 95% conversion rate and 100% N2 selectivity even under room temperature when the mass content of rGO was optimized to 0.6
January 2018
Synthesis of aryloxide-containing half-titanocene catalysts grafted to soluble polynorbornene chains and their application in ethylene polymerization: Integration of multiple active centres in a random coil
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Ashutosh Thakur, Ryuki Baba, Patchanee Chammingkwan, Minoru Terano, Toshiaki Taniike A series of monodisperse polynorbornene (PNB) chains bearing different contents of aryloxide ligands at their side chain were synthesized by Grubbs ring-opening metathesis copolymerization between norbornene and 2-aryloxonorbornene. These PNB chains were employed as a soluble support for grafting half-titanocene complexes to afford structurally well-defined supported catalysts, where a pre-defined number of Ti centres was confined in a nano-sized random coil of PNB chains. Extensive investigation in ethylene polymerization revealed unique catalytic features of these soluble polymer-supported catalysts, represented by a synergistic activity enhancement among multiple active centres confined in a random coil. The well-defined nature of these novel polymer-supported catalysts is powerful in studying interactions between active centres and supports as well as among active centres themselves in catalysis.

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January 2018
Isomerisation of n-hexane over bifunctional Pt-heteropoly acid catalyst: Enhancing effect of gold
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Abdulrahman Alazman, Domagoj Belic, Elena F. Kozhevnikova, Ivan V. Kozhevnikov Isomerisation of n-hexane was studied in the presence of acid and bifunctional metal-acid catalysts based on Keggin-type heteropoly acids (HPA), in particular focusing on Cs2.5H0.5PW12O40 (CsPW) and Pt/CsPW as the catalysts, using a fixed-bed microreactor under differential conditions (n-hexane conversion

Ti3+-TiO2/g-C3N4 mesostructured nanosheets heterojunctions as efficient visible-light-driven photocatalysts
Publication date: January 2018
Source:Journal of Catalysis, Volume 357 Author(s): Siyu Tan, Zipeng Xing, Jiaqi Zhang, Zhenzi Li, Xiaoyan Wu, Jiayi Cui, Junyan Kuang, Qi Zhu, Wei Zhou Ti3+ self-doped TiO2/g-C3N4 mesostructured nanosheets heterojunctions (Ti3+-TiO2/Meso-g-C3N4) have been prepared via calcination-sonication assisted method using amino cyanamide as precursors, combined with a solid-state chemical reduction method. The Ti3+-TiO2/Meso-g-C3N4 heterojunctions with narrow band gap of
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