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Citation: LUO Sha, WU Nan, ZHOU Bo, HE Song-bo, QIU Jie-shan, SUN Cheng-lin. Effect of alumina support on the performance of Pt-Sn-K/γ-Al2O3 catalyst in the dehydrogenation of isobutane[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(12): 1481-1487. shu

Effect of alumina support on the performance of Pt-Sn-K/γ-Al2O3 catalyst in the dehydrogenation of isobutane

  • 1.

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China;

  • Corresponding author: QIU Jie-shan,  SUN Cheng-lin, 
  • Received Date: 23 July 2013
    Available Online: 28 September 2013

  • Alumina supports were synthesized by hydrochloric acid reflux and ammonia precipitation methods; after that the Pt-Sn-K/γ-Al2O3 catalysts were prepared by complex impregnation method under vacuum with alumina of different sources as the supports. The catalysts were characterized by N2 physisorption, CO pulse chemisorption, H2 temperature-programmed reduction, NH3 temperature-programmed desorption and thermogravimetric analysis; the effect of the alumina support on the performance of Pt-Sn-K/γ-Al2O3 catalysts in the dehydrogenation of isobutane was investigated. Compared with the catalyst supported on Al2O3 from hydrochloric acid reflux, the catalyst supported on the Al2O3 from ammonia precipitation is provided with smaller platinum particle size and weaker acidic distribution, and then exhibits higher activity and selectivity to isobutene in isobutane dehydrogenation. Moreover, the catalyst with Al2O3 synthesized by ammonia precipitation as the support exhibits better resistance against coke deposition and the coke deposited also has a lower degree of graphitization, which endues the catalyst with better stability. During a long term test of 14 d over the catalyst with Al2O3 synthesized by ammonia precipitation as the support, the conversion of isobutane is initially 56.67% and then decreased to 34.71% after 14 d; meanwhile, the initial selectivity to isobutene is 80% and it remains approximate 94% after 7 d.
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