화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.17, No.1, 71-76, January, 2011
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Location and structure of coke generated over Pt.Sn/Al2O3 in propane dehydrogenation
Bao Khanh Vu, Myoung Bok Song, In Young Ahn1, Young-Woong Suh1, Dong Jin Suh1, Jae Sung Kim, and Eun Woo Shin†
  • School of Chemical Engineering and Bioengineering, University of Ulsan, Daehakro 102, Nam-gu, Ulsan 680-749, South Korea
  • 1Korea Institute of Science and Technology, Wolsong-gil 5, Seongbuk-gu, Seoul 136-791, South Korea
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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.
Keywords:Propane dehydrogenation;Catalyst deactivation;Coke structure;Coke location
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