Journal of Industrial and Engineering Chemistry

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Location and structure of coke generated over Pt-Sn/$Al_{2}O_{3}$ in propane dehydrogenation

  • Vu, Bao Khanh (School of Chemical Engineering and Bioengineering, University of Ulsan) ;
  • Song, Myoung Bok (School of Chemical Engineering and Bioengineering, University of Ulsan) ;
  • Ahn, In Young (Korea Institute of Science and Technology) ;
  • Suh, Young-Woong (Korea Institute of Science and Technology) ;
  • Suh, Dong Jin (Korea Institute of Science and Technology) ;
  • Kim, Jae Sung (School of Chemical Engineering and Bioengineering, University of Ulsan) ;
  • Shin, Eun Woo (School of Chemical Engineering and Bioengineering, University of Ulsan)
  • Published : 2011.01.25
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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 $2{\theta}=25^{\circ}$ 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/$Al_{2}O_{3}$ to catalyst deactivation.

Keywords

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