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

更新时间:2023-05-28

【摘要】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.

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