Two types of catalytic sites of In2O3-Co3O4/CeO2 and their synergy for highly selective CO2 hydrogenation to methanol

Document Type

Article

Publication Date

1-1-2025

Abstract

The increasing concentration of greenhouse gases, specifically CO2, requires innovative mitigation approaches. Catalytic CO2 reduction shows potential for producing high-value-added products from CO2, but the poor catalyst activity and product selectivity remain significant challenges. Oxygen vacancies and the interaction between the support and active components significantly influence the catalytic reactivity of a catalyst. Herein, we demonstrated a novel strategy to design highly efficient catalysts; namely, the reducibility of CeO2 was exploited to tune the In2O3-Co3O4 catalyst for CO2 hydrogenation, creating synergetic double-type active sites that the OV1 oxygen defects (generated by hydrogen reduction) on CeO2 surface as active sites for CO2 adsorption and the In-Co-Ce interfaces as active sites for hydrogenation of the adsorbed CO2 to methanol via formate intermediates. Consequently, an excellent methanol selectivity of 74 % was achieved for CO2 hydrogenation, leading to a very high methanol space–time yield of 276.8 mg∙h−1∙gIn-Co−1 under mild reaction conditions (3 MPa, 280 °C, 2400 mL∙gcat−1∙h−1), which is 4.8-fold higher than that without CeO2. This study highlights the highly synergistic effects of two types of catalytic sites of the CeO2 supported In2O3-Co3O4 catalyst and reveals a new pathway for designing new catalysts for more efficient CO2 hydrogenation to methanol (CHTM).

Publication Title

Chemical Engineering Journal

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