双功能
合成气
催化作用
Boosting(机器学习)
材料科学
无机化学
结晶学
化学
计算机科学
有机化学
机器学习
作者
Zheyi Sun,Bin Shao,Zihao Gao,Zhonghao Jia,Honglai Liu,Jun Hu
标识
DOI:10.1021/acs.jpcc.4c00961
摘要
The direct conversion of syngas to light olefins (STO) over a metal oxide-zeolite bifunctional catalyst has been recognized as a breakthrough development, but the bottleneck of low CO conversion efficiency still exists. Herein, we stepwise develop binary and ternary metal oxides of ZnxCryMnz to reveal the roles of individual metals. Through theoretical prediction and in situ characterizations, the produced Cr1Mn1.5O4 spinel by Cr doping exhibits a higher concentration of oxygen vacancies, correlating with higher CO adsorption and catalytic activity, whereas further Zn incorporation generates the satellite ZnCr2O4 spinel around Cr1Mn1.5O4 spinel, giving higher H2 dissociation capability and extra oxygen vacancies. Coupling with SAPO-34, a stable CO conversion efficiency as high as 60.4% at the C2–C4 olefin selectivity of 76.4% is dramatically achieved during a long-term test of 160 h in the fixed bed of granulated Zn0.10Cr0.36Mn0.54/SAPO-34, providing a promising industrial application future of this STO approach.
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