Article
Chemistry, Physical
Kamran Ghasemzadeh, Milad Ghahremani, Taher Yousefi Amiri, Angelo Basile, Adolfo Iulianelli
Summary: A comprehensive computational fluid dynamic model has been developed to predict the behavior of a membrane reactor in dehydrogenation of methylcyclohexane for hydrogen production, showing the membrane reactor outperforms the equivalent traditional reactor in terms of complete conversion and high hydrogen recovery rate under different operating parameters.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Chemistry, Applied
Junchi Meng, Feng Zhou, Huixia Ma, Xingzhou Yuan, Yanjuan Wang, Jian Zhang
Summary: Methylcyclohexane (MCH) is considered an excellent hydrogen energy carrier with potential industrial applications. The Methylcyclohexane-toluene-hydrogen (MTH) cycle allows for material and energy recycling. The research on catalysts for MCH dehydrogenation process under low temperature and high pressure conditions is key to industrialize the MTH system.
TOPICS IN CATALYSIS
(2021)
Article
Engineering, Environmental
Anton P. Koskin, Sergey A. Stepanenko, Maria Alekseeva (Bykova), Olga A. Bulavchenko, Evgeny Y. Gerasimov, Anton I. Lysikov, Petr M. Yeletsky, Vasily V. Kaichev, Vadim A. Yakovlev
Summary: High-loaded nickel catalysts modified with tin have been developed for the dehydrogenation of methylcyclohexane, achieving high selectivity at different conversion rates and flow rates. The stability of the modified catalysts has been demonstrated through long-term testing.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Chengjing Mi, Yanping Huang, Fengtao Chen, Kui Wu, Weiyan Wang, Yunquan Yang
Summary: DFT calculations were used to study the catalytic dehydrogenation of methylcyclohexane on Ni-Pt(111) catalyst, which showed weaker binding strength between species and surface metal atoms compared to Pt(111). Pt was identified as the main active component in stable adsorption configurations on Ni-Pt(111).
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Kui Wu, Fengtao Chen, Feng Wang, Yanping Huang, Zhigang Shen, Weiyan Wang, Yunquan Yang
Summary: In this study, Pt supported on Mg-Al oxide catalysts were prepared to enhance the hydrogen evolution rate in the dehydrogenation of methylcyclohexane (MCH). The effects of the co-precipitation reaction time during the preparation of Mg-Al hydrotalcite on their structural properties were studied, showing increased pore diameter and Pt dispersion with prolonged reaction time. The resultant catalysts exhibited high activity and stability in the dehydrogenation process.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Wenhan Wang, Guoqing Cui, Cunji Yan, Xuejie Wang, Yang Yang, Chunming Xu, Guiyuan Jiang
Summary: In this study, an internal electric heating (IEH) assisted mode was proposed, in which the Pt/Al2O3/FF catalyst achieved high catalytic efficiency with a hydrogen evolution rate of above 2060 mmol·g(Pt)·min(-1) in the MCH dehydrogenation process.
Article
Energy & Fuels
Tianyu Cao, WooJae Lee, Renjing Huang, Raymond J. Gorte, John M. Vohs
Summary: The cyclic molecule 1,2,3,4-tetrahydroquinoline (THQ) has been examined as a liquid-organic hydrogen carrier (LOHC) for endothermic fuel in hypersonic aircraft engines. It showed high conversion rates and stability, making it a potential alternative for endothermic cooling.
Article
Chemistry, Physical
Munjeong Jang, Subin Choi, Yoondo Kim, Junyoung Cha, Ah-Reum Kim, Hyangsoo Jeong, Yongmin Kim, Sun Hee Choi, Suk Woo Nam, Jongwoo Lim, Chang Won Yoon, Hyuntae Sohn
Summary: A highly reducible CeO2 surface was prepared on a SiO2 support to investigate the effect of redox properties of CeO2 on the catalytic activity of Pt/CeO2-SiO2 for MCH dehydrogenation. The well-dispersed Pt particles averaging 1.1 nm in size (Pt/CeO2-SiO2) were primarily attributed to the high surface concentration of oxygen vacancies. The excellent catalytic activity of Pt/ CeO2-SiO2 was attributed to the presence of rich oxygen vacancies on the CeO2 surface.
APPLIED SURFACE SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Alexander N. Kalenchuk, Leonid M. Kustov
Summary: The kinetics of dehydrogenation reactions of polycyclic naphthenes were simulated based on real experimental data. It was found that the reaction of the 1st order predominates in the series of cyclohexane-bicyclohexyl-perhydroparatherphenyl. However, for other substrates, the probability of describing the reaction using the 2nd order equation increases significantly, with the trans-decalin reaction becoming the predominant form of describing the kinetics.
Article
Chemistry, Physical
Feng Hu, Yanan Duan, Ting Xia, Yongzhi Li, Xin Zhao, Jianyi Xu, Guofang Zhang, Ying Cai, Yanghuan Zhang
Summary: The addition of graphene improves the microstructure, kinetics, and thermodynamic properties of the CeMg12/Ni alloy. It refines the grains, increases the surface defects, and promotes the dissolution of Ni in the main phase of the alloy. The thermal stability of the alloy hydride is lowered, leading to improved dehydrogenation performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Physical
Vinita Yadav, Ganesan Sivakumar, Virendrakumar Gupta, Ekambaram Balaraman
Summary: The use of hydrogen diversifies energy sources by significantly reducing greenhouse gas emissions and environmental pollution during energy conversion, but hydrogen storage remains a challenge. Liquid organic hydrogen carrier (LOHC) systems have gained importance as an alternative to traditional storage methods, utilizing alcohols for catalytic dehydrogenation-hydrogenation processes to develop economical, safe, and easily handled hydrogen storage systems.
Article
Multidisciplinary Sciences
Opeyemi A. Ojelade, Sharif F. Zaman
Summary: This study investigated the thermodynamic analyses of LOHCs using the reversible MTS system for H-2 storage, showing high equilibrium conversion rates and yields. Low temperature and high pressure favor toluene hydrogenation, while catalyst design improvement is needed for efficient reactions at atmospheric pressure.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Akihiko Fukunaga, Asami Kato, Yuki Hara, Takaya Matsumoto
Summary: Dehydrogenation of methylcyclohexane (MCH) was studied using a solid oxide fuel cell (SOFC). Toluene and benzene were observed as the products of MCH's dehydrogenation reaction at a cell temperature of 420 degrees C and a current density of 16 mA cm-2, with a molar ratio of 94:6. When the cell was operated at 490 degrees C and 90 mA cm-2, in addition to toluene and benzene, 1,4-dioxane was formed at a molar ratio of >86%, indicating an oxidative dehydrogenation reaction of MCH. Furthermore, it was discovered that SOFCs can be applied to the oxygen displacement reaction of benzene rings.
Article
Chemistry, Physical
Hiroya Ito, Kazumasa Oshima, Tsuyoshi Yamamoto, Kah Wei Ting, Takashi Toyao, Takeharu Sugiyama, Yuzuru Kato, Kentaro Morita, Asuka Ohashi, Masahiro Kishida
Summary: The addition of selenium (Se) improves the stability and catalytic activity of Pt catalysts, promoting the desorption of products and suppressing catalyst deterioration through an electron donation effect.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Malek Y. S. Ibrahim, Jeffrey A. Bennett, Milad Abolhasani
Summary: A study reported a photo flow reactor using Rh/TiO2 photocatalyst to achieve the selective dehydrogenation of 1,2,3,4-tetrahydroquinoline, reducing the optimal Rh loading by 10 times compared to a batch reactor and facilitating catalyst reuse and regeneration, thus overcoming the energy and cost barriers in hydrogen production reaction.