Article
Chemistry, Physical
Paulo Victor C. Azevedo, Mateus Dias, Arthur Henrique A. Goncalves, Luiz Eduardo P. Borges, Alexandre B. Gaspar
Summary: The study shows that the addition of cadmium can enhance the efficiency of the partial hydrogenation of benzene, and the Ru0.2CdAl catalyst exhibits higher activity and product yield during the reaction.
MOLECULAR CATALYSIS
(2021)
Article
Engineering, Chemical
Jie Yu, Qi Zhang, Qiancheng Zheng, Zhengbao Wang
Summary: A wet-chemistry reaction-adsorption strategy was used to fabricate Ru-Zn-La/ZrO2 catalysts for selective hydrogenation of benzene to cyclohexene. The catalyst preparation process was systematically investigated and verified. The reaction rate constants, selectivity, and catalytic behavior were found to be influenced by factors such as particle size, electron transfer effect, Zn species content, and surface hydrophilicity of the catalyst. A passivation treatment before the hydrogenation reaction significantly promoted cyclohexene selectivity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
G. P. Costa, A. H. A. Goncalves, L. A. V. Viana, J. C. S. Soares, F. B. Passos, F. M. T. Mendes, A. B. Gaspar
Summary: Ruthenium catalysts supported on zinc-promoted amorphous-niobium mixed oxides were prepared and characterized in this study using various techniques such as X-ray analysis and H-2 chemisorption. It was found that catalysts containing zinc showed higher selectivity, while those without zinc exhibited higher activity.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Chemistry, Physical
Morad M. El-Hendawy, Abd El-Motaleb M. Ramadan, Mohamed M. Ibrahim
Summary: The study investigated the catalytic hydrogenation of cyclohexene by a newly synthesized ruthenium(III) Schiff base complex using various physicochemical methods. It was found that the catalytic activity depends mainly on solvent composition. Density functional theory was applied to explore the mechanistic story of the catalytic reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Gongbing Zhou, Yi Li, Qihan Sha
Summary: Manipulating the shape of Ru nanocrystals can enhance catalytic performance and provide a well-defined catalytic model for investigating the mechanism of benzene semi-hydrogenation. The shape of the Ru nanocrystals determines the types and numbers of active sites, which affects the turnover frequency and selectivity of the reaction.
APPLIED SURFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Haijie Sun, Yiru Fan, Xiangrong Sun, Zhihao Chen, Huiji Li, Zhikun Peng, Zhongyi Liu
Summary: Zn2+ or Fe2+ can enhance the selectivity towards cyclohexene but hinder the catalytic activity towards benzene hydrogenation; the presence of ZnO in Ru-Zn catalyst leads to increased adsorption of Zn2+ and Fe2+, resulting in improved selectivity towards cyclohexene synthesis.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Ruidong Shi, Xiaohui Wang, Gongbing Zhou
Summary: Regulating the geometric and electronic configurations of interfacial active sites is an attractive approach to design high-efficiency catalysts. In this study, Ru/TMTFs-x catalysts with tunable chemical states were constructed by utilizing the electronic metal-support interaction (EMSI) and a 3D porous TiO2 nanoflower derived from 2D Ti3C2 MXene nanosheets. The catalysts exhibited high turnover frequency and excellent initial cyclohexene selectivity, which were attributed to the unique geometric architecture and EMSI-directed electron-deficient configuration of Ru, as well as the positive correlation between cyclohexene selectivity and the electron-deficient degree of Ru.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Hiroya Ishikawa, Naoki Nakatani, Sho Yamaguchi, Tomoo Mizugaki, Takato Mitsudome
Summary: We report the use of ruthenium phosphide nanoparticles (Ru2P/SiO2) as a highly active and robust catalyst for the hydrogenation of sulfur-containing nitroarenes, showing 34 times higher activity than Ru nanoparticles. Various sulfur-containing nitroarenes were successfully hydrogenated under 1 bar of H2, leading to high yields of aniline products, including valuable pharmaceutical intermediates. The study highlights the importance of the electronic and geometrical effects of P surrounding Ru species in Ru2P/SiO2 for enhanced activity and durability against sulfur poisoning.
Article
Engineering, Chemical
Yeqing Huang, Feng Xiong, Zhenyuan Zou, Yi Huang, Zhenxia Zhao, Baoyu Liu, Jinxiang Dong
Summary: A dual-template strategy with PEG and CTAB was used to synthesize beta-zeolite nanocrystal aggregates with ultrafine and hierarchical structure. The size of the aggregates and nanocrystals can be tuned by adjusting the CTAB/PEG ratios. In the alkylation reaction, the PEG-presented aggregates exhibited outstanding activity and resistance to deactivation, indicating that PEG played a role in reducing the nanocrystal size and enhancing diffusion properties. The deactivation of zeolites was attributed to channel blockage and loss of active sites, and the aggregates also showed robust regeneration performance.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Hiroya Ishikawa, Naoki Nakatani, Sho Yamaguchi, Tomoo Mizugaki, Takato Mitsudome
Summary: We report the use of ruthenium phosphide nanoparticles (Ru2P/SiO2) as a highly active and robust catalyst for the hydrogenation of sulfur-containing nitroarenes, with activity 34 times higher than that obtained with Ru nanoparticles. Various sulfur-containing nitroarenes were hydrogenated under 1 bar of H2, resulting in high yields of anilines, including important pharmaceutical intermediates. The electronic and geometrical effects of P surrounding Ru species in Ru2P/SiO2 were found to be crucial for enhancing the catalyst's activity and durability against sulfur poisoning.
Article
Polymer Science
Junjie Liu, Mingqi Jia, Fei Yuan, Zitong Hong, Weichao Tong, Chengzhuo Zheng, Chuanqi Wang, Hui Wang
Summary: Hydrogenated nitrile butadiene rubber (HNBR) is a high-performance elastomer widely used in the petrochemical and automotive industries. A ruthenium-based catalyst, M41, was investigated for the direct hydrogenation of NBR latex. The catalytic selectivity for the hydrogenation of -C=C bond instead of -C=N group was confirmed, and the reaction conditions were optimized to obtain high conversion of over 95 mol%. The results suggest that this catalyst could address the limitations in the hydrogenation of NBR latex.
POLYMER INTERNATIONAL
(2023)
Article
Chemistry, Physical
Michael Rauch, Jie Luo, Liat Avram, Yehoshoa Ben-David, David Milstein
Summary: This study reports a novel synthesis of thioesters and reveals the mechanism of their reverse hydrogenation. Experimental and computational approaches were used to elucidate the likely pathway of the reactions and discuss the impact of hydrogen gas pressure on selectivity. The study also identified the competitive nature of reactions between thiols and alcohols, as well as the stability differences of related catalysts.
Article
Materials Science, Multidisciplinary
Takafumi Ishii, Yuki Kitamura, Seiya Hasegawa, Chiaki Sasaki, Jun-ichi Ozaki
Summary: The study demonstrates that the catalytic activity of metal particles on doped carbon support material can be improved, indicating that introducing heteroatoms can alter the catalytic activity of the catalyst.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Engineering, Chemical
Santulla Leide Bernardes Vasconcelos Carvalho, Eliane Bezerra de Moraes Medeiros, Ayrton de Souza Wanderley, Luccas de Moura Ribeiro, Julia Gabriela da Silva, Ivana Taciana de Almeida Simoes, Nathalia Cecilia do Rego Lemos, Nelson Joaquim Ribeiro Neto, Cesar Augusto Moraes de Abreu, Henrique Macedo Baudel, Nelson Medeiros de Lima Filho
Summary: The conversion of xylose to xylitol was successfully achieved through catalytic reactions using heterogeneous catalysts based on Ni and Ru, involving acid hydrolysis and hydrogenation processes. It was found that in the acid hydrolysis process for xylose extraction, a higher concentration of sulfuric acid led to better results, while in the xylose hydrogenation process, both the conversion rate of xylose and the selectivity to xylitol were close to 90% after 1 hour of reaction.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Chemistry, Organic
Jonathan Barrios-Rivera, Yingjian Xu, Guy J. Clarkson, Martin Wills
Summary: The application of enantiomerically-pure ruthenium(II) catalysts containing N - functionalised TsDPEN ligand to the asymmetric transfer hydrogenation of 15 examples of alpha-heterocyclic acetophenone derivatives is reported, with products of up to 99% ee formed. (C) 2021 Elsevier Ltd. All rights reserved.
Article
Chemistry, Physical
Raphael Soeira Suppino, Richard Landers, Antonio Jose Gomez Cobo
APPLIED CATALYSIS A-GENERAL
(2016)
Article
Engineering, Chemical
Raphael Soeiro Suppino, Antonio Jose Gomez Cobo
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2014)
Article
Chemistry, Physical
Raphael Soeiro Suppino, Richard Landers, Antonio Jose Gomez Cobo
REACTION KINETICS MECHANISMS AND CATALYSIS
(2015)
Article
Engineering, Environmental
Barbara Maria Borges Ribeiro, Jefferson Ferreira Pinto, Raphael Soeiro Suppino, Lucas Marcola, Richard Landers, Edson Tomaz
JOURNAL OF HAZARDOUS MATERIALS
(2019)
Article
Chemistry, Physical
Leticia Franzo de Lima, Julia Leticia Montanari Lima, Diogo Silva Sanches Jorqueira, Richard Landers, Silvia Fernanda Moya, Raphael Soeiro Suppino
Summary: This study compared the catalytic performance of amorphous Nb2O5 and 12% Nb2O5/Al2O3 catalysts for xylose dehydration to furfural, showing that the catalysts exhibited different catalytic activities and selectivities under specific conditions. The research also found that the acid site density and distribution of acid site strength of the catalysts played a crucial role in the catalytic effects.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)