Location and structure of coke generated over Pt-Sn/Al2O3 in propane dehydrogenation

Title
Location and structure of coke generated over Pt-Sn/Al2O3 in propane dehydrogenation
Authors
Bao Khanh Vu송명복안인영서영웅서동진김재성신은우
Keywords
Propane dehydrogenation; Catalyst deactivation; Coke structure; Coke location
Issue Date
2011-01
Publisher
Journal of industrial and engineering chemistry
Citation
VOL 17, NO 1, 71-76
Abstract
Pt and Pt–Sn/alumina catalysts were prepared by either an incipient wetness impregnation or coimpregnation method, and their deactivation behavior, coke structure and coke location in propane dehydrogenation were investigated by XRD, XPS, TPO and reaction tests. The XRD and XPS measurements confirmed that coke structure over all spent catalysts was pregraphite-like carbon, which presents at 2θ = 25˚ in XRD patterns and binding energy = 283.9 eV in XPS spectra. In the TPO results, along with Sn contents, oxidation peak of coke was shifted to a higher temperature, which can be interpreted that coke formed during the reaction wasmainly located on the support in the case of Pt–Sn/ alumina because coke generated onmetal surfaces was readily transferred to the support in the presence of Sn. This would be responsible for high tolerance of Pt–Sn/Al2O3 to catalyst deactivation.
URI
http://pubs.kist.re.kr/handle/201004/39543
ISSN
1226-086x
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