Article
Chemistry, Physical
Bolun Yu, Denan Li, Qianqian Zhu, Shufan Yao, Lifeng Zhang, Yanshuo Li, Zhenxin Zhang
Summary: This study successfully improved the catalytic activity of a zeolitic octahedral metal oxide by incorporating a single zinc species into its micropore. The zinc incorporation achieved a high ethane conversion rate and ethylene selectivity. Mechanism study showed that the isolated zinc site played a crucial role in activating oxygen and ethane, as well as stabilizing intermediates and transition states.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Engineering, Environmental
Runxia Cai, Leo Brody, Yuan Tian, Luke Neal, Arnab Bose, Fanxing Li
Summary: Chemical looping oxidative dehydrogenation (CL-ODH) has the potential to replace steam cracking for ethylene production. Accurate reactor modeling is crucial for scaling up and optimizing this new technology. A one-dimensional packed bed model was used to simulate the CL-ODH of ethane to ethylene, and the results were validated by experiments. Overall, this study provides insights for efficient and optimized operation of CL-ODH reactors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Yukiko Hosono, Hikaru Saito, Takuma Higo, Kosuke Watanabe, Kazuharu Ito, Hideaki Tsuneki, Shun Maeda, Kunihide Hashimoto, Yasushi Sekine
Summary: The study demonstrates that Ce0.8Co0.2O2 catalyst doped with transition metal shows high activity and selectivity for ethylene production in the presence of steam, operating through the Mars-van Krevelen mechanism. The Co-CeO2 interactions play a crucial role in controlling the characteristics of the reactive lattice oxygen suitable for EDH.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Roxanne Hubesch, Maciej Mazur, Karl Foger, P. R. Selvakannan, Suresh K. Bhargava
Summary: Metal lattice structures printed by selective laser melting and functionalized with zeolites have been demonstrated as a promising new generation of catalysts, showing unprecedented catalytic activity. The migration of metal (most likely chromium) from the support into the zeolite phase makes it a promising candidate for endothermic fuels for high-speed flight vehicles.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Applied
Ferran Sabate, Jose Luis Jorda, Maria J. Sabater
Summary: In this study, a fraction of structural Mn cations in cryptomelane oxide K-OMS2 were replaced by different cationic dopants, resulting in the weakening of the Mn-O bond and the production of oxygen vacancy defects. The most active catalyst was found to be the ruthenium doped cryptomelane oxide, which exhibited a higher reducibility and a more weakened Mn-O bond force constant value. All the doping processes enhanced the alcohol conversion and showed a high selectivity towards the aldehyde.
Article
Chemistry, Physical
Jian Wang, Min-Li Zhu, Yong-Hong Song, Zhao-Tie Liu, Li Wang, Zhong-Wen Liu
Summary: In this study, the catalytic performance of CrOx catalyst dispersed on dealuminated b zeolite was investigated using the oxidative dehydrogenation of propane with carbon dioxide as a probe reaction. The results revealed that the dispersion of Cr species and the content of initial highly-dispersed Cr6+ oxides played a crucial role in the activity of the catalyst. The researchers discovered that the oxygen from terminal Cr = O bonds in initial Cr6+ oxides reacted with propane molecules, generating coordinatively unsaturated Cr3+ oxides as active sites for the redox cycles of CO2-ODP.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Xuedi Qin, Huanyang Wu, Ruihang Wang, Liang Wang, Lu Liu, Hangjie Li, Bo Yang, Hang Zhou, Zuwei Liao, Feng-Shou Xiao
Summary: This study developed a reaction process that utilizes CoS-1 catalyst and MnOx @ Na2WO4 for the dehydrogenation of ethane and selective hydrogen combustion, thereby improving the conversion of ethane and the selectivity of ethylene. The process resulted in a per-pass ethane conversion rate of 43.2% and ethylene selectivity of 93.1% at 590 degrees Celsius and 0.8 bar of ethane feed.
Article
Chemistry, Physical
Liang Zhao, Ouardia Akdim, Xiaoyang Huang, Kai Wang, Mark Douthwaite, Samuel Pattisson, Richard J. Lewis, Runjia Lin, Bingqing Yao, David J. Morgan, Greg Shaw, Qian He, Donald Bethell, Steven McIntosh, Christopher J. Kiely, Graham J. Hutchings
Summary: The aerobic oxidation of alcohols and aldehydes over supported heterogeneous catalysts involves two interconnected processes: dehydrogenation and oxygen reduction. The rate of the reaction can be greatly enhanced by coupling these processes through electron transport between independent active sites. The ratio of Au/Pd catalysts used and their physical properties play important roles in promoting alcohol oxidation through cooperative redox enhancement (CORE).
Article
Chemistry, Physical
Liang Zhao, Ouardia Akdim, Xiaoyang Huang, Kai Wang, Mark Douthwaite, Samuel Pattisson, Richard J. Lewis, Runjia Lin, Bingqing Yao, David J. Morgan, Greg Shaw, Qian He, Donald Bethell, Steven McIntosh, Christopher J. Kiely, Graham J. Hutchings
Summary: The aerobic oxidation of alcohols and aldehydes over supported heterogeneous catalysts involves dehydrogenation and oxygen reduction processes. The cooperative redox enhancement (CORE) effect, where independent active sites catalyze the processes and electron transport occurs between the catalysts, can greatly influence catalyst design. The Au/Pd ratio used in physical mixtures of monometallic catalysts and phase-separated bimetallic catalysts significantly affects the degree to which CORE effects promote alcohol oxidation. Furthermore, the roles of Au and Pd in this coupled system are found to be interchangeable, potentially due to the relative rates of the coupled reactions and the influence of physical properties. This deeper understanding of CORE factors is an important development in bimetallic catalysis.
Article
Engineering, Environmental
Leo Brody, Luke Neal, Vasudev Haribal, Fanxing Li
Summary: The study introduced a technology to convert ethane into liquid fuels through redox reactions, demonstrating high olefin yields at certain temperatures with low selectivity. Economic analysis showed that introducing a recycling mechanism can enhance profit generation in the process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Xunming Su, Zhong-Pan Hu, Jingfeng Han, Yingxu Wei, Zhongmin Liu
Summary: In this study, ferrous gluconate is developed as an efficient metal precursor for incorporating Fe atoms into the MFI siliceous zeolite framework. The soluble and stable properties of ferrous gluconate under alkaline conditions allow it to participate in the whole crystallization process. The selectively incorporated tetrahedrally coordinated Fe atoms in the Fe-MFI zeolite demonstrate high catalytic activity, propylene selectivity, and durability in propane dehydrogenation.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Biochemistry & Molecular Biology
Mateusz Maciejczyk, Iwona Ptaszynska-Sarosiek, Anna Niemcunowicz-Janica, Michal Szeremeta, Napoleon Waszkiewicz, Agnieszka Kulak-Bejda, Urszula Cwalina, Milosz Nesterowicz, Anna Zalewska
Summary: This study investigates the utility of antioxidant barrier, redox status, and stress biomarkers in different biological fluids in post-mortem analysis of patients with acute alcohol intoxication. The results show significant increase of antioxidant activity and concentration in urine samples, but no significant differences in other circulating fluids. The observations may be influenced by irreversible post-mortem changes. The use of circulating body fluids to assess redox homeostasis is limited in post-mortem analysis.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Applied
Emily Moreno-Barrueta, Carlos Alvarado-Camacho, J. Fernando Duran-Perez, Ariadna-Alicia Morales-Perez, Carlos O. Castillo
Summary: This study evaluates the dynamic performance of a highly selective Ni-based surface in the oxidative dehydrogenation of ethane and proposes a reliable redox surface mechanism. The findings are valuable for the efficient design of industrial reactors for this process.
Article
Chemistry, Physical
Isaac Daniel, Bohyeon Kim, Mark Douthwaite, Samuel Pattisson, Richard Lewis, Joseph Cline, David Morgan, Donald Bethell, Christopher Kiely, Steven Mcintosh, Graham Hutchings
Summary: The cooperative redox enhancement effects in Au-Pd systems play a crucial role in promoting bimetallic catalysis in thermochemical oxidation. The electrochemical polarization of two disparate catalytic sites leads to an observed activity enhancement in thermochemical systems, increasing the driving force of each of the composite half reactions in oxidative dehydrogenation.
Article
Biochemistry & Molecular Biology
Roberta Ceci, Mariateresa Maldini, Mark E. Olson, Domenico Crognale, Katy Horner, Ivan Dimauro, Stefania Sabatini, Guglielmo Duranti
Summary: This study evaluated the antioxidant effect of Moringa oleifera leaf extract (MOLE) on muscle cells under oxidative stress. The results showed that MOLE could restore the redox status of muscle cells, increase the antioxidant enzymatic system, and reduce oxidative damage.
Article
Chemistry, Physical
Yifan Sun, Ye Lv, Wei Li, Jinli Zhang, Yan Fu
Summary: In this study, PtRu electrocatalysts were fabricated on carbon paper via cyclic electrodeposition for the electrocatalytic hydrogenation (ECH) of phenol. The Pt3Ru3 catalyst exhibited excellent activity and stability for the conversion of phenol to cyclohexanol at ambient temperature and various current densities. The in situ Raman spectroscopy and kinetic study revealed the hydrogenation mechanism of phenol over Pt3Ru3 in acidic electrolyte, providing an effective electrochemical strategy for the facile construction of durable electrode materials and efficient phenol hydrogenation.
JOURNAL OF CATALYSIS
(2024)
Article
Chemistry, Physical
Amir Shahzad, Khezina Rafiq, Muhammad Zeeshan Abid, Naseem Ahmad Khan, Syed Shoaib Ahmad Shah, Raed H. Althomali, Abdul Rauf, Ejaz Hussain
Summary: Photocatalytic hydrogen production through water splitting is an effective method for meeting future energy demands. In this study, researchers synthesized a 1 % Ag2S/Cu2S co-doped CdZnS catalyst and found that it can produce hydrogen at a higher rate. The co-doping of Ag2S and Cu2S in the CdZnS catalyst showed a synergistic effect, with Ag2S promoting oxidation reactions and Cu2S promoting reduction reactions.
JOURNAL OF CATALYSIS
(2024)