Article
Chemistry, Physical
Anil Singh Rajpurohit, Venkata Rama Mohan Talla, Madhavan Jaccob, Krishnamurthy Konda Ramaswamy, Balasubramanian Viswanathan
Summary: Nickel catalysts supported on six different titania phases showed remarkable differences in activity and selectivity for the aqueous phase hydrogenation of furfural. The crystal phase of titania, anatase and rutile, played a crucial role in determining the conversion and formation of different hydrogenated products. The activity/selectivity patterns were rationalized based on metal-support interactions and the reducibility of the support.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Materials Science, Multidisciplinary
Xijun Li, Sifan Zhang, Lihua Zhu, Jun Liu, Huan Zhang, Ning Zhao, Bing Hui Chen
Summary: In this study, a series of Pt-based bimetallic catalysts were synthesized using ultrasonic incipient wetness impregnation method, with PtCo5/SBA-15 showing the best catalytic performance for selective hydrogenation of crotonaldehyde. The selectivity of the PtCo5/SBA-15 catalyst for crotonaldehyde to crotyl alcohol is significantly improved with the increase of Co content. Factors contributing to the superior catalytic performance of PtCo5/SBA-15 include the formation of PtCo alloy, synergy effect between Pt and Co, and electron transfer.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Ceramics
Aleksey A. Vedyagin, Ilya V. Mishakov, Ekaterina V. Ilyina
Summary: The aerogel technique is advantageous for synthesizing efficient V-Mg-O catalysts for the oxidative dehydrogenation of propane. The addition of alumina powder allows for easier shaping of the catalysts. Characterization techniques include low-temperature nitrogen adsorption, electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
S. B. Dangi, S. Z. Hashmi, Upendra Kumar, B. L. Choudhary, A. E. Kuznetsov, Saurabh Dalela, Shalendra Kumar, S. N. Dolia, Sudhish Kumar, Balsam F. I. Sofi, Reem Darwesh, P. M. Z. Hasan, P. A. Alvi
Summary: This study focuses on the preparation of PVA-GO nanocomposite films using a simple solution mixing technique and explores their spectroscopic, structural, optical, electrical, and mechanical properties. Various analytical techniques were employed to investigate the effects of GO on the composite materials, revealing an enhancement in properties due to the presence of nanofillers.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Physical
Qi Yang, Yuantao Tang, Haidong Zhang, Jun Chen, Zhiquan Jiang, Kun Xiong, Jingjing Wang, Xinai Liu, Na Yang, Qiuyue Du, Yuting Song
Summary: This study presents a new method for the synthesis of CuMnOx catalysts using a half carbonized citrus grandis peel assisted hard template method. The shift of the oxide pairs from CuO-Cu1.4Mn1.6O4 to Mn2O3- Cu1.4Mn1.6O4 has been achieved by tuning the Cu/Mn molar ratio, resulting in high selectivity and efficiency in the oxidation of benzyl alcohol using H2O2 as oxidant. The interaction between the Cu1.4Mn1.6O4 constituent and Mn2O3 constituent enhances the formation of Cu+ species, leading to a Fenton-like catalytic oxidation process.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Julia Ramirez-Gonzalez, Anthony R. West
Summary: Impedance measurements on Mg-doped alumina ceramics showed a combination of oxide ion conductivity and p-type electronic conductivity depending on temperature and oxygen partial pressure. Co-doping with Mg and Si resulted in a reduction in oxide ion conductivity and p-type conductivity due to direct replacement of Al3+by Mg2+ and Si4+ ions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Gloria Rosetto, Arron C. Deacy, Charlotte K. Williams
Summary: Carbon dioxide derived polymers are becoming useful materials in various applications, requiring more active and selective catalysts for structural diversity. Highly active catalysts can exhibit controllable selectivity for enchainment of mixtures of different compounds, leading to the creation of new polymers with regular carbon dioxide and biomass derived linkages.
Article
Chemistry, Multidisciplinary
Anderson L. Valle, Anielle C. A. Silva, Noelio O. Dantas, Robinson Sabino-Silva, Francielli C. C. Melo, Cleumar S. Moreira, Guedmiller S. Oliveira, Luciano P. Rodrigues, Luiz R. Goulart
Summary: It was discovered that the interaction between zinc oxide nanocrystals and glyphosate can be used for the detection and quantification of the herbicide. However, strong chemical interactions between silver and glyphosate may hinder FTIR identification.
Article
Chemistry, Physical
Namgi Jeon, Okkyun Seo, Jungmok Oh, Jisu Park, Iljun Chung, Jaemyung Kim, Osami Sakata, Akhil Tayal, Yongju Yun
Summary: The presence of V component enhances the catalytic performance of alumina-supported Co-V oxide catalysts for propane dehydrogenation by improving the reducibility of Co nanoparticles and increasing the surface concentration of metallic Co species. The results suggest that V component plays a significant role in modifying the properties of Co oxides and improving their catalytic performance.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Multidisciplinary Sciences
Pavel A. Kots, Tianjun Xie, Brandon C. Vance, Caitlin M. Quinn, Matheus Dorneles de Mello, J. Anibal Boscoboinik, Cong Wang, Pawan Kumar, Eric A. Stach, Nebojsa S. Marinkovic, Lu Ma, Steven N. Ehrlich, Dionisios G. Vlachos
Summary: By using ammonia as a modulator, researchers successfully tuned the metal-support interactions and improved the hydrogenolysis performance of ruthenium deposited on titania. This led to a threefold increase in the hydrogenation efficiency during the conversion of plastic waste to lubricants.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Raquel Lopez-Asensio, Juan Antonio Cecilia-Buenestado, Concepcion Herrera-Delgado, Maria Angeles Larrubia-Vargas, Cristina Garcia-Sancho, Pedro Jesus Maireles-Torres, Ramon Moreno-Tost
Summary: A family of Mg/Al hydrotalcites was synthesized as precursors for MgAlOx mixed oxides. The mixed oxides showed catalytic activity in the reduction of furfural to furfuryl alcohol using isopropanol as a hydrogen donor. Different catalytic parameters were tested and the adsorption behavior of furfural and isopropanol on the catalyst was analyzed. The results showed that the catalytic performance was influenced by the basicity of the catalysts and deactivation was caused by adsorbed species, mainly furfural-derived compounds.
Article
Chemistry, Multidisciplinary
Konstantin Khivantsev, Ja-Hun Kwak, Nicholas R. Jaegers, Iskra Z. Koleva, Georgi N. Vayssilov, Miroslaw A. Derewinski, Yong Wang, Hristiyan A. Aleksandrov, Janos Szanyi
Summary: In this study, the mechanism of NO reduction using Cu/zeolite catalysts was investigated using spectroscopy, catalysis, and DFT calculations. It was found that nitrosyl ions are the key intermediates and nitrogen gas is produced through the intermediacy of the diazo N2H+ cation. The formation of NH4+ at low temperatures inhibits the catalytic cycle, while at higher temperatures, the cycle can continue.
Article
Chemistry, Physical
Yimeng Lyu, Jennifer N. Jocz, Rui Xu, Olivia C. Williams, Carsten Sievers
Summary: The research focuses on synthesizing ceria-zirconia supported mono and bi-metallic transition metal oxide clusters by dry impregnation, revealing the nature of the catalysts through various characterization techniques. Direct oxidation of methane to methanol is achieved, with methoxy species identified as a key intermediate for methanol production.
Article
Chemistry, Physical
Nengneng Xu, Cameron A. Coco, Yudong Wang, Tianshun Su, Yu Wang, Luwei Peng, Yanxing Zhang, Yuyu Liu, Jinli Qiao, Xiao-Dong Zhou
Summary: The study utilized a catalyst combining ZrO2 with CuOx to oxidize methane into 1-propanol and 2-propanol, with enhanced activity explained by density functional theory calculations, showing high catalytic activity and stability.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Natalia Anna Wojcik, Sharafat Ali, Jakub Lech Karczewski, Bo Jonson, Michal Bartmanski, Ryszard Jan Barczynski
Summary: The study investigated the effects of replacing Na2O with MgO on the electrical, biosolubility, and thermal properties of bioactive glasses. The results showed that the DC conductivity of the glasses decreased after MgO substitution, and the ion conduction mechanism mainly involved ion hopping. In terms of biosolubility, the addition of magnesium improved the dissolution rate of the glasses and supported the formation of CaP-rich layers on the surface.
