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The formation of active phases in Pt-containing catalysts for bicyclohexyl dehydrogenation in hydrogen storageстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Bogdan T., Kalenchuk A., Kustov L., Bogdan V.
- Журнал: Physical Chemistry Chemical Physics
- Том: 25
- Год издания: 2023
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 690
- Последняя страница: 699
- DOI: 10.1039/D2CP04457A
- Аннотация: The fundamental role of the carbon carrier - Sibunit ® in the formation of active and selective phases in low-percentage Pt-containing catalysts Pt/C, Pt/Ni/C, Pt/Ni-Cr/C for the complete dehydrogenation of bicyclohexyl into biphenyl (320°C, 1 atm) is shown. The Pt/Ni-Cr/C catalyst showed the greatest activity and selectivity in complete dehydrogenation of bicyclohexyl into biphenyl. Detailed analysis of catalysts surface by XPS, TEM-HR, EDX methods revealed two main processes we associated with activity and successful course of the reaction of bicyclohexyl dehydrogenation: the formation of carbides Pt1-xCx and graphitization of the carbon carrier. The formation of carbide phases is most pronounced for Pt/C and Pt/Ni-Cr/C systems, where the yield of the target product – biphenyl is noticeably higher than on the Pt/Ni/C catalyst. Graphitization of the carbon carrier is most pronounced for Pt/Ni/C, where the yield of biphenyl is significantly reduced. The formation of graphite for the Pt/Ni/C catalyst at the metal-carrier interface leads to the encapsulation of a metal particle in a graphite shell, which apparently determines its low activity in the conversion of bicyclohexyl.
- Добавил в систему: Богдан Татьяна Вениаминовна