我室谢兆雄教授在 ACS catalysis 上发表论文：Dynamic Phase Transition of Iron Oxycarbide Facilitated by Pt Nanoparticles for Promoting the Reverse Water Gas Shift Reaction

摘要：The catalytic activation of CO₂ is a crucial process in CO₂ recycling for both fundamental research and industrial applications. Fe-based catalysts have been demonstrated to be highly active for the reverse water gas shift (RWGS) reaction. However, the structural complexity and dynamic reduction/oxidation/carburization of iron-based catalysts mean that it is challenging to understand the mechanism of these catalysts and further improve their reaction activity. Herein, we report a highly efficient Pt/Fe₃O₄ catalyst for the RWGS reaction, in which the content of Pt is only 0.017 wt %. The CO₂ conversion rate reaches 46.9 × 10^–5 mol_CO2/(g_cat s) with a CO selectivity of up to 99.7% at reaction conditions of 500 °C and atmospheric pressure. Structure–performance investigations reveal that the reduction process of Fe-based supports can be enhanced by the in situ formation of Pt nanoparticles, which significantly promote the dynamic phase transition of Fe₃O₄ to Fe₃C via carburization and thus considerably improve CO₂ activation. The synergistic interaction of Pt with Fe-oxycarbide improves catalytic activity and ensures long-term catalytic stability. This simple strategy by improving the reduction process of Fe-based catalysts to promote carburization provides an alternative way to manipulate the activity and selectivity of Fe-based catalysts in CO₂ hydrogenation.

文章链接：https://pubs.acs.org/doi/10.1021/acscatal.1c03772