The synthesis of rutile-type V/Sb mixed oxides, catalysts for the ammoxidation of propane to acrylonitrile: A comparison of high-energy milling and co-precipitation methods

Ballarini, N.; Berry, F. J.; Cavani, F.; Cimini, M.; Ren, X.; Tamoni, D. and Trifiro, F. (2007). The synthesis of rutile-type V/Sb mixed oxides, catalysts for the ammoxidation of propane to acrylonitrile: A comparison of high-energy milling and co-precipitation methods. Catalysis Today, 128(3-4) pp. 161–167.

DOI: https://doi.org/10.1016/j.cattod.2007.06.080

Abstract

This paper describes the preparation of rutile-type V/Sb mixed oxide (vanadium antimonate) with the ball-milling (mechano-chemical) method starting from single metal oxides, as well as the comparison with a similar system prepared by the co-precipitation method. Samples were tested as catalysts for the gas-phase ammoxidation of propane to acrylonitrile. The mechano-chemical method allowed the preparation of the rutile-type mixed oxide characterized by smaller crystallite size than the catalyst prepared by co-precipitation and calcined at 450 °C. The calcination at 700 °C of the sample prepared by the mechano-chemical method led to a crystalline vanadium antimonate characterized by a higher concentration of cationic defects than the corresponding calcined sample prepared by co-precipitation. This led to a considerably higher activity in propane ammoxidation, but to a lower selectivity to acrylonitrile.

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