Опубликована: Янв. 1, 2024

Achieving high activities and selectivity for the reverse water-gas shift (RWGS) reaction at low-temperatures continues to pose a significant challenge. Ni-based catalysts have been widely employed in CO2 hydrogenation due their strong capacity dissociate H2, but they exhibit low CO. Herein, we successfully altered product via controlling distribution of Ga species on Ni/CeO2 catalysts. When was combined with Ni form spinel NiGa2O4 (NiGa2O4/CeO2), main While, doped into CeO2 support (Ni/Ga4-CeO2), CH4. The supported exhibited excellent performance RWGS reaction, CO over 99%, production rate as 74.5 mmol/gcat·h 450 oC 24000 mL/gcat·h, without any loss activity after 72 h. Ni/Ga4-CeO2, containing metallic abundant oxygen vacancies, enhanced methanation process, conversion 81.38%, CH4 136 mmol/gcat·h. CO-TPD analysis revealed that NiGa2O4/CeO2 catalyst weak adsorption CO*, which played key role enhancing towards Subsequent in-situ DRIFTS further confirmed differences obtained from NiGa4/CeO2 Ni/Ga4-CeO2 were formation different intermediate surface, leading change products. This study provides new idea switch reduction by species.

Язык: Английский