Location and structure of coke generated over Pt-Sn/Al2O3 in propane dehydrogenation
- Location and structure of coke generated over Pt-Sn/Al2O3 in propane dehydrogenation
- Bao Khanh Vu; 송명복; 안인영; 서영웅; 서동진; 김재성; 신은우
- Propane dehydrogenation; Catalyst deactivation; Coke structure; Coke location
- Issue Date
- Journal of industrial and engineering chemistry
- VOL 17, NO 1, 71-76
- 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.
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