Kinetics study on supported indium-based catalysts in carbon dioxide hydrogenation

被引：0

作者：

Cao C. ^{[1
]}

Chen T. ^{[1
]}

Ding X. ^{[1
]}

Huang H. ^{[1
]}

Xu J. ^{[1
]}

Han Y. ^{[1
]}

机构：

[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai

来源：

Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 10期

关键词：

Carbon dioxide; Catalysts; In-situ DRIFTS; Kinetics; Methanol synthesis; Temperature-programed experiments;

D O I：

10.11949/j.issn.0438-1157.20190570

中图分类号：

学科分类号：

摘要：

In this work, the effect of support materials on the kinetic behaviors of indium-based catalysts in carbon dioxide hydrogenation was studied. A series of supported indium-based catalysts were prepared and tested. Only group ⅣB metal (Ti, Zr and Hf) oxide supported indium-based catalysts had substantial catalytic activity. Particularly, In1/HfO2 and In1/ZrO2 catalysts showed high methanol selectivity, while In1/TiO2 mainly catalyzed the reverse water-gas shift reaction. Steady-state kinetics, in-situ diffuse reflectance infrared Fourier transform spectroscopy and temperature-programmed experiments indicate that the key surface reaction intermediate over In1/HfO2 and In1/ZrO2 are formate and methoxy species, and methanol is produced via stepwise hydrogenation of the surface formate. In1/HfO2 possesses the strongest hydrogen splitting and hydrogenation ability, thus favoring methanol synthesis. Over In1/TiO2, no significant surface carbonaceous species was detected under reaction conditions. The improved CO production might be related to interfacial oxygen defects facilitating the redox cycle and decomposition of formate intermediate. © All Right Reserved.

引用

页码：3985 / 3993

页数：8

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