合成气
催化作用
粒径
三元运算
铜
选择性
化学工程
乙醇
化学
粒子(生态学)
金属
材料科学
物理化学
有机化学
海洋学
计算机科学
工程类
程序设计语言
地质学
作者
Yongjun Liu,Zhiwen Li,Peng Luo,Nan Cui,Kejing Wang,Wei Huang
标识
DOI:10.1016/j.apcatb.2023.122949
摘要
Understanding particle size effect of metal on catalysis has great significance in scientific and industrial applications. Herein, CuZnAl catalysts with narrow Cu particle size distribution had been synthesized and investigated for syngas to ethanol. Selectivity toward to C2+OH sharply increased from 8.9% to 60.5% with the increase of Cu size from 11.8 to 38.3 nm, then it slightly increased to 68.6% when further increasing the size to 49.2 nm, which was attributed to the domination of Cu (111) facet and accompanied by the formation of Cu(111)-ZnO interface at larger Cu sizes, thereby weakened hydrogenation activity and facilitated CHx formation. The in-situ DRIFTS experiment revealed that carbon chain growth was processed by the insertion of CO*/CHO* into the CHx* and the coupling of CHx* and CO2 *. These results substantially broaden the understanding the size effect of Cu and provided guidance for design more active Cu-based catalyst for ethanol synthesis.
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