Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (10): 938-942.doi: 10.3866/PKU.WHXB19991014

• ARTICLE • Previous Articles     Next Articles

Mechanism of Propane and iso-butane Oxidehydrogenation on VMgO Catalyst

Chen Ming-Shu, Weng Wei-Zheng, Wan Hui-Lin   

  1. Department of Chemistry,Institute of Physical Chemistry，and State Key Laboratory for Physical Chemistry of Solid Surface,Xiamen University,Xiamen 361005
  • Received:1998-12-03 Revised:1999-05-10 Published:1999-10-15
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Abstract:

The reactivation and transformation of propane and iso-butane in the presence of oxygen on VMgO catalyst have been studied by temperature programmed reaction-FTIR. The results showed that breaking of the second C-H bond of C 3H 8 and the tertiary C-H bond of i-C4H10 may have been involved in the activation step, i.e. rate-limited step for propane and iso butane oxidative dehydrogenation. In propane oxidehydrogenation COx may either directly come from deep oxidation of propane, or come from consecutive oxidation of propene. While most of the cracking products ethene and methane are directly come from propane.The breaking of C-C bond in i-C4H10 is easier than that in C3H8.

Key words: Propane, Iso-butane, Oxidehydrogenation, Reactivity, TPR-FTIR