Partial oxidation and ammoxidation of isobutane over Bi-Mo-based composite oxide with Nb 2O 5

Abstract

Conversion of isobutane to methacrylonitrile via ammoxidation was studied using mixed catalysts composed of BiMo-based composite oxides and various type of Nb 2O 2. The activity for ammoxidation of isobutane on Nb 2O 5 is fairly poor, and that the products were methacrolein without formation of methacylonitriIe. The activity of BiMo-based composite oxides for the ammoxidation of isobutane was also fairly low and that the selectivity to methacylonitrile and methacrolein was 60–80%. The mixed catalyst composed of BiMo-based composite oxides and amorphous Nb 2O 5 and that supported by γ-Al 2O 3 and SiO 2 which have strong acid properties were improved their catalytic activity with keeping of their selectivity for ammoxidation of isobutane to methacrylonitrile.