Propane ammoxidation on Bi promoted MoVTeNbOx oxide catalysts: Effect of reaction mixture composition

• MoVTeNb catalyst promoted by Bi was studied in propane ammoxidation.
• Bi-modified MoVTeNb catalyst demonstrates increased selectivity to acrylonitrile.
• The transformation of acrylonitrile is lowered due to decreased catalyst acidity.
• The effect of propane, ammonia, and oxygen concentrations was investigated.

MoVTeNbO catalysts were characterized with XRD, XPS, and FTIR techniques and tested in the ammoxidation of propane. Bismuth-modified MoVTeNbO catalysts showed a higher acrylonitrile yield than the base four-component system. The effect of the reaction mixture composition (C3H8, NH3 and O2) on selectivity towards different products was studied at propane conversion above 80%. The favorable effect of bismuth promoter on the selectivity towards acrylonitrile was explained by suppression of acrylonitrile transformation connected with decreasing acidity of the catalyst.

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