催化作用
脱氢
焦炭
乙烯
化学
碳氢化合物
化学工程
无机化学
有机化学
沸石
工程类
作者
Sudipta De,Samy Ould-Chikh,Antonio Aguilar,Jean-Louis Hazemann,Andrea Zitolo,Adrian Ramirez,Selvedin Telalovic,Jorge Gascon
标识
DOI:10.1021/acscatal.0c05170
摘要
The nonoxidative catalytic dehydrogenation of ethane allows the production of ethylene at lower temperatures than those applied in steam crackers. This, however, requires stable catalysts that minimize coke production. Here, we report a single-component, promoter-free, low-loading, Cr-based catalyst exhibiting high activity, long-term stability, and improved regeneration properties for the direct dehydrogenation of ethane to ethylene. According to our detailed operando X-ray absorption spectroscopic analysis, the use of all-silica MFI zeolite as support promotes the stabilization of CrII(−O–Si≡)2 species with high coke resistance, even when the dehydrogenation is carried out under high ethane partial pressures (1.5 bar).
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