Effect of alumina support on the performance of Pt-Sn-K/γ-Al<sub>2</sub>O<sub>3</sub> catalyst in the dehydrogenation of isobutane

LUO Sha; WU Nan; ZHOU Bo; HE Song-bo; QIU Jie-shan; SUN Cheng-lin

Volume 41 Issue 12

Dec. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(12): 1481-1487

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.

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.

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

1.
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China;
2.
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China;
4.
School of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China

Received Date: 2013-07-23
Rev Recd Date: 2013-09-28
Publish Date: 2013-12-30

Abstract

Abstract

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.
- alumina,
- Pt-Sn-K/&gamma,
- -Al₂O₃,
- isobutane,
- dehydrogenation,
- hydrochloric acid reflux,
- ammonia precipitation

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References(21)

References

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