Article
Chemistry, Physical
S. Gabra, E. J. Marek, S. Poulston, G. Williams, J. S. Dennis
Summary: This study demonstrates that by controlling the structure of oxygen carriers based on strontium ferrite, the yield of chemical looping epoxidation reaction can be significantly increased. Samples with a specific ratio of SrFeO3 and RP phase mixed exhibit optimal performance, leading to a 4-fold increase in yield.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Ankush Kumar Tangra, Mohammed Benali Kanoun, Souraya Goumri-Said, Ahmed-Ali Kanoun, Kevin Musselman, Jaspinder Kaur, Gurmeet Singh Lotey
Summary: Perovskite solar cells using inorganic hole and electron transport layers (HTL and ETL) have been studied to enhance efficiency. The study found that the use of strontium ferrite (SrFe2O4) as HTL and zinc oxide (ZnO) as ETL improved power conversion efficiency. Numerical modeling showed the importance of optimizing layer thickness and defect density for better solar cell performance.
Article
Chemistry, Physical
Xunxun Li, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu
Summary: Perovskite oxides have been developed as promising catalysts for catalytic oxidation of volatile organic compounds due to their specific structures and low cost. In this study, nanotube perovskite oxides with high surface areas were prepared using a nanocasting array method. Precious metal palladium was loaded on the surface to enhance catalytic performance, showing good stability and efficient degradation of organic compounds at low temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Environmental
Bin Zhu, Qi-Wei Li, Ye-Cheng Li, Ya-Qiang Xia, Jing -Lin Liu, A-Min Zhou, Xiao-Min Zhang
Summary: Plasma-catalysis technique is a promising approach to control air pollution caused by volatile organic compounds (VOCs). Perovskite-type oxides have excited much interest in constructing plasma-catalytic system for the oxidation removal of VOCs owing to their flexible electronic structure, alterable geometry, unique catalytic properties and high stability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Crystallography
Daryn B. B. Borgekov, Artem L. L. Kozlovskiy, Rafael I. I. Shakirzyanov, Ainash T. T. Zhumazhanova, Maxim V. V. Zdorovets, Dmitriy I. I. Shlimas
Summary: The purpose of this study is to investigate the impact of lanthanum concentration on the phase formation, conductivity, and thermophysical properties of perovskite-like strontium ferrite ceramics. The study also explores the potential of obtaining two-phase composite ceramics. The results show that the increase in lanthanum concentration leads to significant changes in the dielectric permittivity and electrical resistivity of the ceramics.
Article
Materials Science, Multidisciplinary
Changjing Fu, Qiang Ma, Qibing Wu, Zaifang Yuan, Zhanqiang Wu, Jun He, Xuewei Li
Summary: In this study, a bifunctional oxygen electrocatalyst based on LSCF was designed and synthesized, which exhibited more surface oxygen vacancies and catalytically active sites for efficient oxygen reduction and evolution reactions. The integration of silver nanoparticles and graphene provided a fast pathway for electron transfer and mass diffusion. The flexible Zn-air battery with Ag/LSCF@graphene as the cathodic catalyst displayed high power density, large specific capacity, and superior charge/discharge stability.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Environmental
Peng Zhang, Xuelei Mei, Xiaochan Zhao, Jing Xiong, Yuanfeng Li, Zhen Zhao, Yuechang Wei
Summary: This study demonstrated that the substitution of A-site with potassium ions in double perovskite-type oxides can enhance the surface density of active sites and improve the catalytic performance for soot purification. The 3D ordered macroporous structure of the catalysts significantly promoted the contact efficiency between the catalyst and soot particles, leading to superior purification performance. The proposed mechanism suggests that the increase in surface oxygen density induced by potassium ion doping plays a crucial role in promoting the oxidation of NO to NO2 during the catalytic process.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Chemical
Adelya Khaliullina, Anastasia Meshcherskikh, Liliya Dunyushkina
Summary: The effect of Sr deficiency on the hydration process and conductivity of SrZrO3 proton conductors was investigated. Sr deficiency was found to enhance hydration ability and the ceramics with certain Sr deficiency showed purely protonic conductivity in humid atmospheres. The highest conductivity was achieved at a Sr content of 0.98.
Article
Engineering, Environmental
Chunwang Lv, Junshuai Zhang, Liqiang Yan, Hongwei Chen, Mingjiang Hu
Summary: This study investigates the optimization of sulfur tolerance and catalytic activity of Co-based perovskite catalysts through doping with Ce and/or Fe. The results show that Ce dopant improves catalytic activity, while Fe dopant enhances sulfur tolerance. Doping alters the oxidation state and oxygen vacancy content, leading to increased catalytic activity. Co-doping of Ce and Fe leads to the formation of a Ce-Fe solid solution, which promotes the mobility and decomposition of sulfates.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Ravinder Kumar, Kapil Dev Singh, Ravi Kumar
Summary: In this study, perovskite-type La1-xSrxCrO3 (0 <= x <= 0.30) compounds were synthesized using the co-precipitation method and their structural properties were investigated by X-ray diffraction. The as-synthesized samples exhibited an orthorhombic crystal structure with Pnma space group. The introduction of Sr2+ caused a decrease in lattice parameters and cell volume, resulting in a peak shift in the X-ray diffraction pattern. Raman and FTIR spectroscopy revealed the effects of Sr2+ substitution on bond lengths and bond angles, as well as the vibrations of chemical bonds in LaCrO3.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Xiao Chen, Senran Hao, Tengda Lu, Mian Li, Lina Han, Peng Dong, Jie Xiao, Xiaoyuan Zeng, Yingjie Zhang
Summary: Direct carbon solid oxide fuel cell (DC-SOFC) is a potential and prospective technology for converting chemical energy from coal fuels into electricity with high efficiency and environmental friendliness. In this study, vanadium-doped B-site-deficient La0.5Sr0.5FeO3-delta (LSFVx) perovskite materials were synthesized and developed as the anode of DC-SOFCs for brown coal utilization. The electrochemical performances of the vanadium-doped perovskites were greatly improved compared to pure LSF, indicating that vanadium doping can effectively expand the three-phase reaction boundaries of the cell and enhance catalytic activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jeesoo Seok, Andres Molina Villarino, Zixiao Shi, Yao Yang, Mahdi Ahmadi, David A. Muller, Francis J. DiSalvo, Hector D. Abruna
Summary: This study investigates the stability issues of La-based perovskite oxide electrocatalysts for the oxygen reduction reaction in alkaline fuel cells. The authors tested nine different electrocatalysts and found that while some initially showed promising activity, they all degraded significantly, with evidence of irreversible leaching of the B-site cation species. The findings highlight the need for stability metrics to validate claims of promising electrocatalytic activity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Inorganic & Nuclear
N. Subhashini, S. Revathi, Mohd Ubaidullah, Abdullah M. Al-Enizi, S. Muthulakshmi, D. Thiripurasundari, Shoyebmohamad F. Shaikh, Ayman Nafady, Meera Moydeen Abdulhameed, Nouf B. B. Alanzi, Rayana Ibrahim Alkhalifah, Chandra Sekhar Dash, M. Sundararajan, M. Sukumar
Summary: The combustion-based synthesis of BiFeO3 (BFO) and Gd:BFO perovskite nanoparticles was presented. XRD analysis showed that the undoped BFO sample had a single perovskite phase with a rhombohedral structure, while the Gd-doped samples exhibited a structural phase transformation from rhombohedral to orthorhombic. The presence of Bi3+, Gd3+, Fe2+, and O2+ ions in the perovskite samples was confirmed by XPS, and elemental functional groups were detected by FT-IR spectroscopy. The direct band gap decreased as the Gd concentration increased. The synthesized catalysts, particularly Gd:BFO (x = 0.25), exhibited higher conversion and selectivity efficiencies for glycerol in catalytic oxidation studies.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Environmental
Yanzhi Li, Shi Liu, Kehan Yin, Dongyan Jia, Yundong Sun, Xueying Zhang, Jingchun Yan, Li Yang
Summary: The ABO(3)-type perovskite oxides have the advantages of being able to tailor the redox capability of transition metal elements in their lattice structure through a simple doping strategy, making them an ideal platform for catalytic combustion of VOCs. This study synthesized and analyzed a series of La1-xSrxCo1-yFeyO3 perovskites for toluene combustion. Among the catalysts, La0.5Sr0.5Co0.8Fe0.2O3-delta (LSCF) showed remarkable activity for toluene oxidation and exhibited superior stability. The outstanding catalytic activity of LSCF perovskite is attributed to the enhancement of redox ability, generation of oxygen vacancies, and activation of lattice oxygen species.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Hung-Chieh Hsu, Sheng-Ting Hong, Shih-Hsiung Wu, Chuan-Feng Shih
Summary: In this study, a multifunctional perovskite solar antenna (PVKSA) was designed and implemented, capable of harvesting solar energy and transmitting high-frequency signals. The PVKSA utilized a perovskite layer and a transparent conducting oxide as the antenna ground, with the perovskite solar cell encapsulated by poly (methyl methacrylate) (PMMA). Electromagnetic simulation was employed to optimize the structure, and the use of a highly conductive oxide film as the bottom electrode significantly increased the antenna gain. The PMMA layer prevented the release of water vapor and oxygen, reducing degradation and maintaining a high power conversion efficiency of approximately 80% after 48 hours.
ORGANIC ELECTRONICS
(2023)
Article
Chemistry, Applied
Xing Zhang, Yuxi Liu, Jiguang Deng, Lin Jing, Xiaohui Yu, Zhuo Han, Hongxing Dai
Summary: Transition metal oxides (MOx)-doped titania solid solution catalysts were prepared and characterized for the oxidation of 1,2-dichloroethane. Among them, 10CrOx-TiO2 exhibited the highest catalytic activity and resistance to chlorine poisoning, attributed to strong acidity, redox ability, high adsorbed oxygen species concentration, and strong interaction between TiO2 and CrOx.
Article
Chemistry, Applied
Zhuo Han, Lingyun Dai, Yuxi Liu, Jiguang Deng, Lin Jing, Yingxin Zhang, Kunfeng Zhang, Xing Zhang, Zhiquan Hou, Wenbo Pei, Hongxing Dai
Summary: Three-dimensionally ordered macroporous (3DOM) MnCo2O4 supported Co3O4 and AuPd catalysts were prepared and showed excellent catalytic activity for methane combustion. The catalyst with 1.98% AuPd and 2.1% Co3O4 exhibited the highest activity at high temperatures. Partial deactivation of the catalyst by water vapor or carbon dioxide was reversible.
Review
Environmental Sciences
Meng-Fei Han, Xu-Rui Hu, Yong-Chao Wang, Zhen Tong, Can Wang, Zhuo-Wei Cheng, Ke Feng, Miao-Miao Qu, Jian-Meng Chen, Ji-Guang Deng, Hsing-Cheng Hsi
Summary: Continuous emissions of VOCs from industrial processes pose serious environmental and health threats. Photodegradation and biofiltration technologies are efficient in controlling VOCs emissions. The combination of these technologies can overcome challenges faced by separate applications, making it a promising field for practical engineering.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Xing Zhang, Lingyun Dai, Yuxi Liu, Jiguang Deng, Lin Jing, Zhiwei Wang, Wenbo Pei, Xiaohui Yu, Jia Wang, Hongxing Dai
Summary: The study investigated the impact of porous supports on the catalytic performance of bimetallic RuCo nanoparticles in the oxidation of 1,2-dichloroethane. HZSM-5 exhibited the highest catalytic activity and chloride resistance compared to meso-MgO and meso-Al2O3 supported RuCo nanoparticles.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Zhiquan Hou, Lingyun Dai, Yuxi Liu, Jiguang Deng, Lin Jing, Wenbo Pei, Ruyi Gao, Yuan Feng, Hongxing Dai
Summary: A novel Pd/Co single-atom catalyst (Pd1Co1/Al2O3) was prepared for benzene oxidation by the research team, achieving a benzene conversion of 90% at 250 degrees Celsius. The catalyst exhibited enhanced sulfur resistance performance and good regeneration ability of the active sites.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Shaohua Xie, Zhiwei Wang, Wei Tan, Yatong Zhu, Samantha Collier, Lu Ma, Steven N. Ehrlich, Peng Xu, Yong Yan, Tao Xu, Jiguang Deng, Fudong Liu
Summary: A novel two-step wetness impregnation method was developed to fabricate a unique and highly stable CeO2/Al2O3 support, enabling Pd catalysts anchored on this support to exhibit higher activity and thermal stability in CO and hydrocarbon oxidations. This approach can be applied as a universal method to prepare stable metal oxide-alumina-based supports, with broad applications in environmental catalyst design.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Xiuqing Hao, Lingyun Dai, Jiguang Deng, Yuxi Liu, Lin Jing, Jia Wang, Wenbo Pei, Xing Zhang, Zhiquan Hou, Hongxing Dai
Summary: In this study, nanotubular OMS-2 support was synthesized using a hydrothermal redox reaction and used to prepare single-atom Pt and Pt-NP catalysts for benzene oxidation. The 0.0383Pt(1)/OMS-2 catalyst exhibited the best catalytic performance with a 90% benzene conversion rate achieved.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Review
Environmental Sciences
Yong-Chao Wang, Meng-Fei Han, Ti-Pei Jia, Xu-Rui Hu, Huai-Qun Zhu, Zhen Tong, Yu-Ting Lin, Can Wang, De-Zhao Liu, Yong-Zhen Peng, Gen Wang, Jie Meng, Zeng-Xiu Zhai, Yan Zhang, Ji-Guang Deng, Hsing-Cheng Hsi
Summary: This paper compares odor standards in different countries and summarizes the emission characteristics and control technologies of livestock farms, including ammonia concentration, sampling methods, odor analysis methods, and three categories of control technologies: physical, chemical, and biological.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Physical
Sijie Lv, Yun Hau Ng, Ruixue Zhu, Shuang Li, Chunxiao Wu, Yuxi Liu, Yafei Zhang, Lin Jing, Jiguang Deng, Hongxing Dai
Summary: In this study, a phosphorus vapor assisted synthetic strategy was used to fabricate P-doped ultrathin hollow g-C3N4 photocatalysts, which exhibited high photocatalytic hydrogen evolution performance. The ultrafast time-resolved spectroscopy was employed to reveal the charge dynamics in the P/UH-CNS system.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Shuang Li, Yun Hau Ng, Ruixue Zhu, Sijie Lv, Chunxiao Wu, Yuxi Liu, Lin Jing, Jiguang Deng, Hongxing Dai
Summary: In this study, a red phosphorus (RP)/TiO2 composite system was constructed via a chemical vapor deposition strategy, leading to a significantly enhanced visible-light-driven photocatalytic H2 generation rate. The tight interior surface bonding between RP and TiO2 greatly promoted efficient charge transfer and redistribution, extending the lifetimes of active charges during the photocatalytic process.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Zhiwei Wang, Shaohua Xie, Ying Feng, Peijie Ma, Kun Zheng, Erhong Duan, Yuxi Liu, Hongxing Dai, Jiguang Deng
Summary: Fe2O3 supported single atom Pt catalysts were synthesized via a novel impregnation-pyrolysis method, showing good light-thermal conversion efficiency and high toluene oxidation performance under simulated sunlight irradiation. The role of Vis-IR light in the photothermal catalytic oxidation of toluene was highlighted, and a possible reaction pathway was proposed based on experiments.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Yajie Shu, Jian Ji, Ming Zhou, Shimin Liang, Quan Xie, Sitan Li, Biyuan Liu, Jiguang Deng, Jianping Cao, Shengwei Liu, Haibao Huang
Summary: Surface fluorination and Pt deposition on TiO2 can reduce the formation of NOx during photocatalytic oxidation of low-concentration NH3, changing the photocatalytic pathway of NH3 conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Environmental
Yuan Feng, Chongchen Wang, Can Wang, Haibao Huang, Hsing-Cheng Hsi, Erhong Duan, Yuxi Liu, Guangsheng Guo, Hongxing Dai, Jiguang Deng
Summary: The Pt-1/MnOx catalyst shows different catalytic stabilities for the oxidation of toluene and iso-hexane, with improved stability for toluene oxidation after hydrogen reduction treatment. Balancing lattice oxygen mobility and organic compounds adsorption is crucial for the catalytic stability of Pt-1/MnOx.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kemeng Ji, Guohong Liang, Yuhao Shen, Hongxing Dai, Jiuhui Han, Yoshikazu Ito, Takeshi Fujita, Jun-ichi Fujita, Chengyang Wang, Mingming Chen
Summary: Ordered porous functional materials, including microporous metal-organic frameworks and mesoporous silica, have been extensively studied for their unique physiochemical properties and broad potential applications. However, the lack of ordered macroporous materials, especially those with high crystallinity, hinders the extension of these advantages to a larger scale. Through a co-sacrificial template sequential pyrolysis process, a three-dimensionally ordered macroporous framework material, OMGCs, has been developed, consisting of well-crystallized graphenic carbon and uniformly dispersed metallic nanocrystals. These OMGCs exhibit a low-temperature formation mechanism and may greatly expand the family of ordered porous framework materials for emerging applications.
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Chemistry, Applied
Xun Wang, Yu-Xuan Li, Xiao-Hong Yi, Chen Zhao, Peng Wang, Jiguang Deng, Chong-Chen Wang
Summary: In this study, BUC-21/N-K2Ti4O9 composites were synthesized via ball-milling and showed excellent photocatalytic performance in reducing Cr(VI) under both UV and white light irradiation. The introduction of N-K2Ti4O9 broadened the light absorption range of BUC-21 and inhibited electron-hole recombination, leading to enhanced photocatalytic activity. Mechanisms of photocatalytic Cr(VI) reduction were proposed and confirmed through various experiments.
CHINESE JOURNAL OF CATALYSIS
(2021)
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.