CO2 hydrogenation to methanol over Cu/CeO2 and Cu/ZrO2 catalysts: Tuning methanol selectivity via metal-support interaction

By Weiwei Wang, Z. Qu, Lixin Song, Q. Fu. Journal of Energy Chemistry, 2020

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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 °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.

Subfields: Catalysis, Materials Chemistry, Process Chemistry and Technology

View Paper: https://www.semanticscholar.org/paper/e3dd164b8a15d6d6204459a6322a6533c62a1117