Effect of various modifying elements on the catalytic properties of vanadium-phosphorus catalysts in oxidation of butane

Abstract

The flow-through method was applied to a study of the catalytic properties of vanadium-phosphorus catalysts (V: P = 1 : 1.2) prepared by the method of interaction of H3PO4 with V2O2 solution in HCl to which a Li, Ba, Mn, Fe, Co, Ni, Cu, Zn, Pd, Cd, Sn, or Ce salt was added as a modifying substance. The catalysts were ordered in a sequence according to the selectivity found in oxidation of butane. Catalysts with modifying elements whose ions possess an incomplete outer electron shell exhibit higher selectivity and yields of maleic anhydride than those in which the introduced ions possess a complete outer electron shell.