脱氢
选择性
催化作用
丙烷
X射线光电子能谱
丙烯
材料科学
金属间化合物
合金
无机化学
光化学
化学
化学工程
有机化学
冶金
工程类
作者
Sai Chen,Zhi‐Jian Zhao,Rentao Mu,Xin Chang,Jun Luo,Stephen C. Purdy,A. Jeremy Kropf,Guodong Sun,Pei Chen,Jeffrey T. Miller,X. H. Zhou,Evgeny I. Vovk,Yong Yang,Jinlong Gong
出处
期刊:Chem
[Elsevier]
日期:2021-02-01
卷期号:7 (2): 387-405
被引量:100
标识
DOI:10.1016/j.chempr.2020.10.008
摘要
Propane dehydrogenation (PDH) is a commercial propylene production technology that has received much attention, but high reaction temperatures result in a decrease of propylene selectivity and catalyst stability. This paper describes a single-site [PtZn4] catalyst by assembling atomically ordered intermetallic alloy (IMA) as a selective and ultrastable PDH catalyst. The catalyst enables more than 95% of propylene selectivity from 520°C to 620°C. No obvious deactivation is observed within the 160-h test, superior to PtSn/Al2O3 and state-of-the-art Pt-based catalysts. Based on in situ X-ray absorption fine structure, X-ray photoelectron spectroscopy measurements, and density functional theory calculations, we reveal that the surface [PtZn4] ensembles in PtZn IMAs serve as the key active site structures, wherein the geometry-isolated and electron-rich Pt1 site in [PtZn4] ensembles readily promotes the first and second C–H cleavage of propane but inhibits further dehydrogenation of surface-bounded propylene. This significantly improves the selectivity and stability by prohibiting coke side reactions.
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