Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (8): 1242-1248.DOI: 10.1016/S1872-2067(15)60893-2

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Oxidative dehydrogenation of ethane with CO2 over Cr supported on submicron ZSM-5 zeolite

Yanhu Chenga, Fan Zhanga, Yi Zhanga, Changxi Miaob, Weiming Huaa, Yinghong Yuea, Zi Gaoa   

  1. a Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China;
    b Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
  • Received:2015-01-28 Revised:2015-05-11 Online:2015-07-29 Published:2015-07-30
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (20773027, 20773028 and 21273043) and the Science & Technology Commission of Shanghai Municipality (08DZ2270500).

Abstract:

A series of submicron ZSM-5-supported chromium oxide catalysts were prepared and characterized by XRD, N2 adsorption, 27Al MAS NMR, SEM, XPS, laser Raman spectroscopy and diffuse reflectance UV-Vis spectroscopy. The catalytic performance of these materials during ethane dehydrogenation in the presence of CO2 was investigated. The catalysts exhibited both high activity and stability, with an ethane conversion of ~65% and ethylene yield of ~49% without any obvious deactivation following 50 h. Characterization results show that the excellent catalytic performance results from the high degree of dispersion of CrOx species on the submicron ZSM-5 surface. Both a high Si/Al ratio and the use of the Na-form of the ZSM-5 support were found to favor CrOx dispersion. The promotional effect of CO2 on the dehydrogenation reaction was quite evident and can be attributed to the reverse water-gas shift reaction.

Key words: Dehydrogenation, Ethane, ZSM-5 zeolite, Submicron, Carbon dioxide