Hits:

Indexed by:期刊论文

Date of Publication:2020-01-01

Journal:JOURNAL OF ENERGY CHEMISTRY

Included Journals:SCIE、EI

Volume:40

Page Number:22-30

ISSN No.:2095-4956

Key Words:CO2 hydrogenation; Methanol selectivity; In-situ DRIFTS; CeO2; ZrO2

Abstract:Copper-based catalysts for CO2 hydrogenation to methanol are supported on ZrO2 and CeO2, respectively. Reaction results at 3.0 MPa and temperatures between 200 and 300 degrees C reveal that Cu catalysts supported on ZrO2 and CeO2 exhibit better activity and selectivity than pure Cu catalyst due to Cu-support (ZrO2 and CeO2) interaction. Combining the structural characterizations with in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS), Cu/CeO2 shows the higher methanol selectivity due to the formation of main carbonates intermediates, which are closely related with the oxygen vacancies over Cu/CeO2. In contrast, bicarbonate and carboxyl species are observed on Cu/ZrO2, which originates from the hydroxyl groups presented on catalyst surfaces. Difference in CO2 adsorption intermediates results in the distinct methanol selectivity over the two catalysts. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.