双金属片
水煤气变换反应
催化作用
合金
氢氧化物
层状双氢氧化物
材料科学
化学工程
化学
无机化学
冶金
有机化学
工程类
作者
Kwang Young Kim,Wonsik Jang,Woo Jin Byun,Ji Young Lee,Miri Kim,Ju Hyeong Lee,Geun Bae Rhim,Min Hye Youn,Dong Hyun Chun,Seok Ki Kim,Seungho Cho,Jae Sung Lee
标识
DOI:10.1021/acscatal.4c01249
摘要
Bimetallic alloy catalysts with finely controlled composition and atomic mixing of the two active metals are vital for maximizing their synergistic effect in enhancing catalytic performances. Herein, we report the design and synthetic strategy of bimetallic Cu–Co alloy catalysts well dispersed on Al2O3 from a CuCoAl-layered double hydroxide (LDH) for boosting the reverse water–gas shift (RWGS) performance by controlling the composition and textural properties of Cu–Co alloy particles. An optimized Cu9Co1/Al2O3 catalyst exhibits a remarkably high CO2 to CO conversion rate (∼0.247 mol h–1 gcat–1) with ∼99.4% of CO selectivity at a relatively low reaction temperature of 400 °C, which outperforms a monometallic Cu/Al2O3 catalyst and a reference Cu9Co1/Al2O3 catalyst prepared by a conventional impregnation method. A combined experimental and theoretical study reveals that the superior activity of the Cu9Co1/Al2O3 catalyst is attributed to two factors: (i) a modified electronic structure due to the Cu–Co alloy formation that facilitates CO2 activation and CO desorption and (ii) formation of well-dispersed alloy nanoparticles by using LDHs as the catalyst precursors.
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