期刊
JOURNAL OF CATALYSIS
卷 293, 期 -, 页码 67-75出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.06.005
关键词
Propane; Dehydrogenation; Catalyst lifetime; Coke formation; In situ UV/Vis spectroscopy
资金
- Deutsche Forschungsgemeinschaft (DFG) [Sonderforschungsbereich 546]
Catalytic performance of VOx/MCM-41 possessing highly dispersed VOx species in non-oxidative propane dehydrogenation (DH) was compared with that of industrially relevant CrOx/MCM-41 and Pt-Sn/Al2O3 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. VOx/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 CrOx/MCM-41 and Pt-Sn/Al2O3 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 VOx species on MCM-41 was not changed during the DH/regeneration cycles, which is the reason for stable performance of the latter catalyst. (C) 2012 Elsevier Inc. All rights reserved.
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