Gas-phase epoxidation of propylene by molecular oxygen over Ag-Cu-Cl/BaCO3 catalyst: Effects of Cu and Cl loadings
نویسندگان
چکیده
منابع مشابه
Stability of Intermediate States for Ethylene Epoxidation on Ag Cu Alloy Catalyst: A First-Principles Investigation
Ethylene oxide, obtained through partial oxidation of ethylene, is an important compound for the chemical industry, because it is widely used as an intermediate for the production of chemicals such as ethylene glycol, which finds applications as an antifreeze and as a precursor to polymers. The oxidation of ethylene can lead either to the desired product (ethylene oxide, EO) or to the formation...
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Combining first-principles calculations and in situ photoelectron spectroscopy, we show how the composition and structure of the surface of an alloy catalyst is affected by the temperature and pressure of the reagents. The Ag-Cu alloy, recently proposed as an improved catalyst for ethylene epoxidation, forms a thin Cu-O surface oxide, while a Ag-Cu surface alloy is found not to be stable. Sever...
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Ag-Cu alloy catalysts for ethylene epoxidation have been shown to yield higher selectivity towards ethylene oxide compared to pure Ag, the unique catalyst employed in the industrial process. Previous studies showed that under oxidizing conditions Cu forms oxide layers on top of Ag. Using first-principles atomistic simulations based on density functional theory, we investigate the reaction mecha...
متن کاملFirst-principles study of the mechanism of ethylene epoxidation over Ag–Cu particles†
Silver–copper alloys have been proposed as catalysts for ethylene epoxidation due to their superior selectivity compared to pure silver, the predominant catalyst for this reaction. Under reaction conditions it has been previously shown that, rather than a two-dimensional (2D) Ag–Cu alloy, a thin copper oxide-like layer forms on top of silver, and several possible surface structures were identif...
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Oxidation of functioning copper has restricted its applicability as a catalyst for commercially important epoxidation of propylene to form propylene oxide. Here, we report that steady-state selectivity in propylene epoxidation on copper (Cu) nanoparticles increases sharply when the catalyst is illuminated with visible light. The selectivity increase is accompanied by light-induced reduction of ...
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ژورنال
عنوان ژورنال: Chinese Journal of Catalysis
سال: 2017
ISSN: 1872-2067
DOI: 10.1016/s1872-2067(16)62539-1