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Chemical Papers

, Volume 72, Issue 4, pp 921–928 | Cite as

Effect of chelating agents on catalytic performance of Cr/γ-Al2O3 dehydrogenation catalysts

  • Guangjian Wang
  • Xingyuan Sun
  • Xinshan Niu
  • Fanfei Meng
  • Fang Wang
Original Paper
  • 184 Downloads

Abstract

Chromia/alumina (Cr2O3/γ-Al2O3) catalysts with addition of chelating agents (citric acid or oxalic acid) were prepared by the incipient impregnation method. The resulting catalysts with different citric acid (CA) or oxalic acid (OA) contents were applied to the dehydrogenation of isobutane to isobutene. The influence of chelating agents on the catalysts was investigated by means of BET, SEM, H2-TPR, NH3-TPD, and TG-DTG. The results showed that the Cr2O3/γ-Al2O3 catalysts with addition of CA or OA exerted slightly increase on specific surface area. The addition of the chelating agents as expected, determined a general decrease in the surface acidity. The catalysts with CA or OA have a better anti-coking ability by inhibiting the side reaction of cracking and carbon formation. The addition of CA or OA for preparing these catalysts resulted in a beneficial effect on the reducibility of the Cr species to diminish the reduction temperature. The appropriate content of chelating agents could improve dispersion of metal species in the γ-Al2O3 support. The catalytic activity showed an important enhancement when the metal species was impregnated in the presence of CA or OA.

Keywords

Cr2O3/γ-Al2O3 Impregnation method Chelating agents Isobutane dehydrogenation Coke formation 

Notes

Acknowledgements

The authors gratefully acknowledge the research grants provided by the National Natural Science Foundation of China (21276130, 21506107), NSF of Shandong Province (ZR2014BP009).

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2017

Authors and Affiliations

  • Guangjian Wang
    • 1
  • Xingyuan Sun
    • 1
  • Xinshan Niu
    • 1
  • Fanfei Meng
    • 1
  • Fang Wang
    • 1
  1. 1.College of Chemical EngineeringQingdao University of Science and TechnologyQingdaoPeople’s Republic of China

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