Comparative study of propane dehydrogenation over V-, Cr-, and Pt-based catalysts: Time on-stream behavior and origins of deactivation

Autor:	Evgenii V. Kondratenko, Sergey Sokolov, Uwe Rodemerck, Mariana Stoyanova, David Linke
Rok vydání:	2012
Předmět:	Inorganic chemistry Oxide chemistry.chemical_element Photochemistry Catalysis Metal chemistry.chemical_compound chemistry Pt based catalysts Propane visual_art visual_art.visual_art_medium Dehydrogenation Physical and Theoretical Chemistry Spectroscopy Carbon
Zdroj:	Journal of Catalysis. 293:67-75
ISSN:	0021-9517
Popis:	Catalytic performance of VO x /MCM-41 possessing highly dispersed VO x species in non-oxidative propane dehydrogenation (DH) was compared with that of industrially relevant CrO x /MCM-41 and Pt–Sn/Al 2 O 3 over four DH (24 h on-stream) and oxidative regeneration cycles. The effect of reduction with H 2 on the catalysts DH properties was also investigated. VO x /MCM-41 in both oxidized and reduced form showed superior time on-stream stability in all DH cycles and its activity could be fully recovered by oxidative regeneration. In situ time-resolved UV/Vis spectroscopy and temperature-programmed oxidation of the used catalysts enabled us to elucidate the origins of the catalysts deactivation. In a single DH cycle, the formation of carbon deposits is the main reason for the deactivation. Activity loss of CrO x /MCM-41 and Pt–Sn/Al 2 O 3 from cycle to cycle was caused by structural changes in the catalytically active metal/metal oxide species. In contrast to these two catalysts, the structure of active VO x species on MCM-41 was not changed during the DH/regeneration cycles, which is the reason for stable performance of the latter catalyst.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::adda6a1b1806d507b3170a82a64318c7 https://doi.org/10.1016/j.jcat.2012.06.005 Zobrazit plný text záznamu Full Text from ScienceDirect