催化作用
层状双氢氧化物
氢氧化物
选择性
色散(光学)
空间速度
离解(化学)
吸附
无机化学
化学工程
金属
化学
材料科学
物理化学
有机化学
光学
物理
工程类
作者
Yi Chen,Hengfeng Hong,Jingyu Cai,Zhaohui Li
出处
期刊:Chemcatchem
[Wiley]
日期:2020-10-23
卷期号:13 (2): 656-663
被引量:33
标识
DOI:10.1002/cctc.202001611
摘要
Abstract Supported Cu‐based catalysts are promising catalysts for RWGS reactions. Herein, CuMgAl‐LDHs (LDHs: Layered double hydroxides) were used as the precursors to obtain supported Cu with good dispersion and high stability. The reduction of CuMgAl‐LDH at 400 °C led to the formation of 0.3CuMgAl‐LDH‐400, with Cu nanoparticles well dispersed on MgO/Al 2 O 3 , which exhibited superior activity and high stability for RWGS. 33.5 % of CO 2 was converted, with selectivity of almost 100 % to CO at 350 °C under a high space velocity, among the highest for RWGS ever reported for Cu‐based catalysts, especially at a low reaction temperature. In‐situ DRIFTS and CO 2 ‐TPD revealed that its superior performance is attributed to high Cu dispersion which is beneficial for the dissociation of H 2 , as well as the presence of variety of basic sites for adsorption towards CO 2 to facilitate the formation of formates. This study demonstrates the great opportunity of LDHs in the preparations of supported metal‐based catalysts.
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