Article
Materials Science, Multidisciplinary
Chuansheng He, Xiaochen Hu, Jia Wang, Lingzheng Bu, Changhong Zhan, Bingyan Xu, Leigang Li, Yunchao Li, Xiaoqing Huang
Summary: In this study, mesoporous Mo-x-Co-O hybrid nanosheets with abundant holes were successfully synthesized using a solvothermal route. These nanosheets exhibited excellent catalytic activity for the oxygen evolution reaction and the dimension and defects of the nanosheets could be controlled by adjusting the molar ratio. The enhanced adsorption of intermediates and oxygen vacancies were the main factors contributing to the excellent catalytic activity of the Mo-0.2-Co-O nanosheets.
SCIENCE CHINA-MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xiang Wang, Junshan Li, Qian Xue, Xu Han, Congcong Xing, Zhifu Liang, Pablo Guardia, Yong Zuo, Ruifeng Du, Lluis Balcells, Jordi Arbiol, Jordi Llorca, Xueqiang Qi, Andreu Cabot
Summary: This study presents the synthesis of cobalt-iron oxide nanosheets with controlled amounts of SO42- anionic groups, which exhibit excellent performance in the electrochemical oxygen evolution reaction (OER). The synthesis involves the use of a cobalt-based zeolitic imidazolate framework as a template and a source of iron and sulfate. Through a diffusion-controlled process, the structure of the framework is etched, forming porous assemblies of nanosheets. Iron ions partially replace cobalt, and sulfate ions are anchored on the material surface. The optimized material demonstrates outstanding OER activity, with a low overpotential and high stability.
Article
Chemistry, Physical
Helapiyumi Weerathunga, Cheng Tang, Aidan J. Brock, Sarina Sarina, Tony Wang, Qiong Liu, Huai-Yong Zhu, Aijun Du, Eric R. Waclawik
Summary: Selective oxidation of alcohols is crucial for fine chemical production, and the photocatalytic oxidation of benzyl alcohol using ZnO nanocrystals was investigated in this study. Different shapes of ZnO nanocrystals displayed varying kinetics for the benzyl alcohol oxidation reaction, with nanocones showing the highest conversion rate. The {10 (1) over bar1} facet of ZnO was found to expose undercoordinated O atoms, leading to the highest adsorption of benzyl alcohol and ultimately resulting in 100% selectivity for benzaldehyde as the product.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Review
Chemistry, Multidisciplinary
Alexios G. Stamoulis, David L. Bruns, Shannon S. Stahl
Summary: This Perspective analyzes the thermodynamic principles underlying catalytic aerobic oxidation reactions and borrows concepts from the study of the oxygen reduction reaction (ORR) in fuel cells. The central role of catalyst overpotential in guiding the development of aerobic oxidation reactions is highlighted. Applications and implications of these concepts are discussed through case studies.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Review
Chemistry, Physical
Ubong J. Etim, Peng Bai, Oz M. Gazit, Ziyi Zhong
Summary: This article discusses the importance of oxidation reactions in the origin of life and industrial applications. The development of green catalysis enables catalytic reactions to be conducted at mild conditions. Activating oxygen molecules under mild conditions remains a major challenge in catalytic oxidation reactions.
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Xiang-Zhu Wei, Tian-Yu Ding, Yang Wang, Bing Yang, Qing-Qing Yang, Shengfa Ye, Chen-Ho Tung, Li-Zhu Wu
Summary: In this work, an electron-rich and oxidation-resistant ligand was introduced to stabilize high-valent iron-oxo species for water oxidation reactions. Advanced spectroscopies and electrochemical studies revealed the formation of a high-valent Fe-V(O) species in water. Kinetic and oxygen isotope labelling experiments, along with organic reactions, demonstrated that the Fe-V(O) species is responsible for O-O bond formation via water nucleophilic attack under real catalytic water oxidation conditions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Ryo Obunai, Keisuke Tamura, Isao Ogino, Shin R. Mukai, Wataru Ueda
Summary: Nano-MoVO nanocrystals, synthesized in a mesoporous carbon template, showed superior properties in the oxidative dehydrogenation of ethane and propane compared to conventional MoVO catalysts. The nanocrystals exhibited a higher mesopore volume and external surface area, as well as higher propane/ethane activation rate ratio and propene selectivity. This suggests the potential benefits of nanocrystalline morphology in limiting overoxidation reactions.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Physical
Mickael Henrion, Yorck Mohr, Kwinten Janssens, Simon Smolders, Aram L. Bugaev, Oleg A. Usoltsev, Elsje Alessandra Quadrelli, Florian M. Wisser, Dirk E. De Vos, Jerome Canivet
Summary: New catechol-based porous polymers were synthesized and used as platforms for the heterogenization of molecular Cu complexes. The resulting Cu@CatMP-1 materials proved to be highly stable and performing catalysts with turnover numbers up to 6000, about 1 to 2 orders of magnitude higher than the current relevant state of the art. The solid catalyst showed recyclability for over 10 runs without metal leaching and has been scaled to the gram scale. The coordination of Cu to catechol within the polymer has been confirmed by X-ray absorption spectroscopy.
Article
Chemistry, Physical
Li Zhao, Piaoping Yang, Song Shi, Guozhi Zhu, Xiao Feng, Weiqing Zheng, Dionisios G. Vlachos, Jie Xu
Summary: Activation of molecular oxygen for selective alcohol oxidation is achieved using a heterogeneous ligand method to prepare a high-efficiency vanadium carbon catalyst. Chemisorbed oxygen and pentavalent vanadium oxide are found to be crucial for catalyst performance. The V-C catalyst activates molecular oxygen to singlet oxygen or its analogue and carries out the reaction through C-H bond activation. The catalyst also shows high efficiency in selectively oxidizing hydroxyl groups in other substrates, providing guidance for the development of nonprecious metal catalysts for aerobic oxidation.
Article
Chemistry, Multidisciplinary
Marcos A. R. da Silva, Nadezda V. Tarakina, Jose B. G. Filho, Carla S. Cunha, Guilherme F. S. R. Rocha, Gabriel A. A. Diab, Romulo Augusto Ando, Oleksandr Savateev, Iker Agirrezabal-Telleria, Ingrid F. Silva, Sara Stolfi, Paolo Ghigna, Maurizio Fagnoni, Davide Ravelli, Piero Torelli, Luca Braglia, Ivo F. Teixeira
Summary: Single-atom catalysis, which combines the domains of homogeneous and heterogeneous catalysis, is of great importance in contemporary science. In this study, a cation exchange method is used to stabilize low-cost iron and manganese single-atoms in a poly(heptazine imides) material. These materials show remarkable selectivity in the photocatalytic oxidation of toluene, and the protocol is extended to the oxidation of other substrates. Mechanistic investigations reveal the formation of high-valent MO species, similar to metalloenzymes, through operando X-ray absorption spectroscopy. The study demonstrates the potential of stabilizing low-cost single-atoms for selective catalysis.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Cheng Lu, Kaixin Li, Chao Wang, Shuaimeng Li, Jinhua Ding, Junhong Jia, Guangan Zhang, Huanian Zhang
Summary: The structure and tribological properties of NiCr-Mo-Ag-O/Mo-V-Ag-O bilayer films were investigated in a wide temperature range, showing a good lubricating effect with low friction coefficients at different temperatures.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Multidisciplinary
Yingwei Li, Shengxin Chen, Ying Jin, Xinxin Li, Ruirui Zhang, Ruixia Liu
Summary: A series of CHR-VOx were prepared by controllable hydrogen treatment and reduced to states dominated by V5+ and V4+ species. The catalytic roles of V-species and O-species for cyclohexane oxidation were explored. The surface properties of CHR-VOx underwent remarkable changes, leading to significant improvement in catalytic performance. XPS and Raman confirmed the reduction behavior. Moderate-reduced CHR-VOx with 78.7% multi-liganded-oxygen (O-L) showed the best conversion for cyclohexane (11.8%), while over-reduced CHR-VOx with a large content of V4+ species (33%) exhibited the best selectivity for adipic acid (44.3%). O-L sites were identified as the active sites for cyclohexane activation, while V4+ species were regarded as oxygen vacancies (OVs) contributing to further oxidation to adipic acid.
Article
Multidisciplinary Sciences
Yuting Zhou, Joaquin Rodriguez-Lopez, Jeffrey S. Moore
Summary: Post-consumer plastic waste has prompted the development of deconstruction methods to recover valuable substances, but depolymerization of highly crystalline engineering thermoplastics remains challenging. In this study, the authors demonstrate the electrochemical depolymerization of polyoxymethylene into repolymerizable monomer under ambient conditions. Through various experiments, they uncover the heterogeneous electro-mediated acid depolymerization mechanism and the dual role of the co-solvent HFIP. This research highlights the potential of electromediated depolymerization in sustainable chemistry by merging renewable energy and circular plastic economy concepts.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Qingsong Zhang, Fanyu Zhang, Jichen Dong, Mingchao Shao, Mingliang Zhu, Dong Wang, Yunlong Guo, Jianling Zhang, Yunqi Liu
Summary: Covalent organic frameworks (COFs) are porous materials with crystallinity and topological diversity. A novel synthetic method to lock the imine bond using amino groups was developed for COFs. The nucleation process of COFs was controlled by precursor hydrolysis, and a family of two-dimensional COFs with high chemical stability and excellent performance was successfully synthesized. One of the materials (BI-COF-1) showed high photocatalytic activity.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Konstantin V. Deriabin, Ekaterina A. Golovenko, Nikita S. Antonov, Sergey V. Baykov, Vadim P. Boyarskiy, Regina M. Islamova
Summary: A platinum polymer catalyst (Pt-PDMS) was synthesized by immobilizing a platinum catalytic complex in a polysiloxane chain using an azide-alkyne CuAAC cycloaddition. Insoluble Pt-PDMS can be used as an effective heterogeneous macrocatalyst for Si-O dehydrocoupling. Pt-PDMS is easy to recover, purify, and reuse again for heterogeneous catalysis.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Qiang Guo, Yehong Wang, Jianyu Han, Jian Zhang, Feng Wang
Summary: Alkene carbonylation reactions have the potential to provide efficient and clean routes for the synthesis of ketones. However, current reactions mainly result in ester and aldehyde formation. In this study, a new approach was developed using a ceria-supported Rh catalyst coupled with alcohol dehydrogenation-transfer-hydrogenation (DTH) reactions to achieve ethylene carbonylation and subsequent C-C bond formation, leading to the production of 3-pentanone. This method offers an alternative route for the selective synthesis of higher ketones via one-step olefin carbonylation.
Article
Chemistry, Multidisciplinary
Lulu Sun, Yike Huang, Shiyang Liu, Xiumei Liu, Nengchao Luo, Feng Wang
Summary: In this study, we show the scission of strong ether C-O bonds promoted by low-work-function Cd single atoms and clusters as photocatalysts. Their loading on ZnS facilitates the breaking of C-H bonds, thus weakening the C-O bond for chemical bond breaking.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Fengan Han, Yanting Liu, Guangyi Li, Lin Yuan, Aiqin Wang, Feng Wang, Tao Zhang, Ning Li
Summary: Zinc molybdate with a disordered layered stacking structure was prepared using an evaporation method and demonstrated excellent catalytic performance for selectively converting lignocellulose-derived ketones to olefins. The outstanding catalytic performance was attributed to its porous structure, higher oxygen vacancy concentration, and higher acidity. Additionally, it also exhibited good catalytic performances for other lignocellulose-derived ketones.
Article
Chemistry, Physical
Puning Ren, Zhuyan Gao, Tiziano Montini, Zhitong Zha, Na Ta, Yike Huan, Nengchao Luo, Emiliano Fonda, Paolo Fornasiero, Feng Wang
Summary: Biomass reforming using solar energy allows for the production of green hydrogen. Current biomass photoreforming inefficiently produces hydrogen due to intermittent solar light and incomplete degradation of biomass C-C bonds. This study overcomes these issues by converting carbohydrates into liquid hydrogen carriers (LHCs) suitable for transportation. The LHCs are then fully decomposed, releasing only H2 and CO2. By prioritizing complete scission of carbohydrate C-C bonds, this process yields 44 g of H2 per kg of glucose. This work demonstrates the production and storage of hydrogen through the complete breakdown of biomass C-C bonds.
Review
Chemistry, Multidisciplinary
Min Wang, Feng Wang, Hongru Zhou
Summary: Biomass exploration is an important topic in renewable energy research. Photocatalytic valorization of biomass into fuels and chemicals is a promising and sustainable method. This article provides a comprehensive review of the research direction of photocatalytic reforming of biomass into syngas (CO + H2) and discusses various strategies and challenges in this field.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Qingchun Xu, Puning Ren, Yang Peng, Nengchao Luo, Zhuyan Gao, Caixia Meng, Jian Zhang, Feng Wang
Summary: In this study, a catalytic Ni complex was designed to work synergistically with TiO2, enabling the reductive coupling of IEO powered by photo-energy. This photocatalytic process provides 1,4-butanediol with high selectivity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Chaofeng Zhang, Yongcan Jin, Feng Wang, Xiaojun Shen, Jinlan Cheng, Cheng Cai
Summary: This review summarizes the strategies and methods for lignin depolymerization into aromatic chemicals, including traditional methods such as pyrolysis, gasification, liquid-phase reforming, solvolysis, chemical oxidation, and newly developed processes like redox-neutral, biocatalysis, and combinatorial strategies. The mechanisms and key intermediates involved in these strategies are discussed. This review provides a comprehensive overview of lignin depolymerization research, offering useful suggestions for further advancements in this field.
Article
Chemistry, Physical
Kun Zhang, Qiang Guo, Yehong Wang, Pengfei Cao, Jian Zhang, Marc Heggen, Joachim Mayer, Rafal E. Dunin-Borkowski, Feng Wang
Summary: In this work, selective ethylene carbonylation to 3-pentanone was achieved using in situ produced hydrogen via a water-gas shift (WGS) reaction on a defective ceria-supported Rh catalyst. The interface of Rh/CeO2 activates water, CO, and ethylene, facilitating the WGS reaction and ethylene carbonylation. A redox pathway for the WGS reaction was proposed based on in situ FTIR results, and water was confirmed as the hydrogen source for ethylene carbonylation through mass spectrometry (MS) study.
Article
Chemistry, Multidisciplinary
Yafei Liang, Yehong Wang, Zhixin Zhang, Jianyu Han, Jian Zhang, Yuda Zhang, Feng Wang
Summary: A Sn-modified CeO2 catalyst with high catalytic performance in the selective conversion of biomass-derived acetone-n-butanol-ethanol (ABE) fermentation was synthesized via a facile ball milling-pyrolysis strategy. The conversion rate of ABE reached 95% with a liquid selectivity of 82% for 4-heptanone, which was superior to other Sn-modified CeO2 catalysts obtained by conventional methods.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Puning Ren, Yue Zhou, Kaiyi Su, Lulu Sun, Nengchao Luo, Feng Wang
Summary: In this study, a CuOx-loaded Nb2O5 photocatalyst was designed, which selectively catalyzes the oxidation of furfural to produce maleic anhydride and its precursor. By loading CuOx and forming a complex, the catalyst can efficiently absorb visible light to activate furfural, leading to C-C bond cleavage and CO generation. This method provides a mild approach for the production of renewable maleic anhydride.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jianyu Han, Jingyi Yang, Zhixin Zhang, Xunzhu Jiang, Wei Liu, Botao Qiao, Junju Mu, Feng Wang
Summary: This research presents a holistic design strategy for multicomponent alloy catalysts and demonstrates the importance of strong metal-support interaction. By establishing a metal atom transport pathway, PtPdCoFe MA with excellent catalytic activity and stability is successfully synthesized at low reduction temperature, and the role of SMSI in the formation of alloy nanoparticles on reducible oxides is revealed.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Xuke Chen, Yu Xia, Zhenyuan Zhang, Lei Hua, Xiuquan Jia, Feng Wang, Richard N. Zare
Summary: Contact between water and oil can result in new chemical reactions, producing CO2, H·, H2, and short-chain hydrocarbons. This reaction is caused by contact electrification at the water-oil microdroplet interface, generating reactive oxygen species.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Yuting Liu, Huifang Liu, Ning Li, Feng Wang
Summary: This study reports a novel photocatalytic strategy for the oxidative C-C cleavage of lignin and β-O-4 derivatives using photoredox organocatalysts. High yields of aromatic aldehydes and phenyl formate were obtained, and mixed binary organic solvents were shown to promote bond cleavage and inhibit over-oxidation side reactions. The absorbance, excitation, and interaction with the lignin model of the photocatalyst in different solvents were investigated, and a C-centered radical intermediate was captured, providing evidence for the direct Cα-Cβ bond cleavage mechanism.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Jianyu Han, Zhixin Zhang, Zhuoran Xu, Lunhua He, Feiran Shen, Yehong Wang, Xuebin Liu, Meiling Guo, Zaihong Guan, Feng Wang
Summary: The interfaces in heterogeneous catalysts have a crucial role in their performances by providing active sites through synergistic effects or modulating the state of active sites. Constructing abundant interfaces in heterogeneous catalysts is challenging due to the high dispersion required for all catalyst compositions involved in substrate activation. A surface reduction strategy is proposed as a solution to this challenge, where a pyramid-type catalyst, (Pt/4nmCeO(2))/SiO2, with maximized interfacial Pt-CeO2 sites is created. This work aids in the development of heterogeneous catalysts by enabling a high level of control over the local chemical environment within nanomaterials.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Kun Zhang, Qiang Guo, Yehong Wang, Pengfei Cao, Jian Zhang, Marc Heggen, Joachim Mayer, Rafal E. Dunin-Borkowski, Feng Wang
Summary: In this study, selective ethylene carbonylation to 3-pentanone was achieved using in situ produced hydrogen via a water-gas shift reaction. The interface of Rh/CeO2 activates water, CO, and ethylene and promotes subsequent reactions, including the water-gas shift reaction and ethylene carbonylation. The hydrogen generated from the water-gas shift reaction suppresses hydrogenation and promotes ethylation.
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.
