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1 Polish Journal of Chemistry

1 2003

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Effect of Additives to VPO System on Its Catalytic Properties in Oxidative Dehydrogenation of Propane and Ethane

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Gąsior M. , Gressel I. , Zazhigalov V. A. , Grzybowska B.

Polish Journal of Chemistry

2003

tom Vol. 77 / nr 7

909-915

Oxidative dehydrogenation (ODH) of propane and ethane has been studied on VPO catalysts with additives of Bi, La, Mo and Zr. The catalysts show promising properties in the ethane ODH, with selectivities to ethene of ~85% at 10% conversion of ethane, but are poor in the propane ODH (maximal selectivities to propene of ~40%). For both alkanes introduction of the additives leads to an increase in the overall rate of the reaction. The effect of the additives on the selectivity to olefins is complex and depends on the reaction temperature, the additive content and the type of alkane. The same additive has in several cases an inverse effect on the selectivity for the propane and ethane ODH. The Mo additive and higher amounts of the La additive increase the selectivity to propene, whereas they decrease the selectivity to ethene. Low content of La additive gives rise to the increase of selectivity to ethene and decrease in that to propene. The differences between the selectivities to olefins in ODH of propane and ethane are discussed as being due to different acido-basic properties of the propene and ethene and their different strength of bonding to the catalyst surface.