Elucidation of the reaction mechanism of catalytic reaction coupling of ethylbenzene dehydrogenation with nitrobenzene hydrogenation over MoO3/TiO2 catalysts
Elucidation of the reaction mechanism of catalytic reaction coupling of ethylbenzene dehydrogenation with nitrobenzene hydrogenation over MoO3/TiO2 catalysts
复制标题
MoO3/TiO2催化剂上乙苯脱氢与硝基苯加氢耦合反应机理的阐明
DOI:
10.1016/j.apcata.2020.117562
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Wong, Hsi-Wu
中科院分区:
文献类型:
--
作者:
Yu, Peng;Yang, Zhengyang;Gu, Zhiyong;Wong, Hsi-Wu
Catalytic coupling of ethylbenzene (EB) dehydrogenation with nitrobenzene (NB) hydrogenation offers potential economical and energetic benefits. However, several studies in the literature have shown that NB conversion could be higher than that of EB, violating the law of mass conversion. This work provides a new understanding of this reaction coupling scheme over MoO3/TiO2catalysts to elucidate this scientific mystery. Our results suggest that EB and NB have different adsorption rates on the TiO2surfaces, resulting in higher NB conversion. In addition, three distinct reaction schemes, each follows a different EB to NB stoichiometric ratio, were identified on the MoO3surfaces. The occurrence of the reactions is dependent on catalyst pretreatment by hydrogen reduction and the amount of oxygen vacancies on the surfaces. Our work explains why mass conservation was not satisfied in some previous studies due to the incorrect reaction stoichiometry used for analyzing the reactant conversions.
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