Layered double hydroxides derived CuFe-based catalysts for CO2 hydrogenation to long-chain hydrocarbons

Abstract

CO₂ hydrogenation to yield long-chain hydrocarbons has attracted tremendous attention in both academic and industrial field. CuFe-based bimetal catalysts have been widely applied in CO₂ hydrogenation owing to their low cost, facile preparation, and excellent performance. In this study, a series of CuFe-based catalysts with different Cu/Fe molar ratios have been synthesized from layered double hydroxide precursor. The optimized CuFe₈-LDO catalyst with Cu:Fe=1:8 exhibits a C₅₊ selectivity of 45% at CO₂ conversion of 9.5%. Through systematic characterizations including TEM, TPR, TPD, XPS, it is revealed the abundant and highly dispersed CuO favors the reduction of iron species, and enhances CO adsorption capacity of as-prepared catalysts. This study provides an in-deep understanding of Cu on CO₂ hydrogenation performance of Fe-based catalysts.