Formation of the Pore Structure of Oxide Vanadium–Titanium–Phosphorus Catalysts in the Course of Thermal Treatment

Abstract

The effect of the conditions of the thermal treatment of vanadium–titanium–phosphorus catalysts on the formation of the pore structure and phase composition was studied. It was found that the optimum doping of catalysts with phosphorus (5 wt % P2O5) was favorable for retention of the high dispersity of primary particles up to 450°C. The main change in the texture of the catalysts occurred within the range of micropores and mesopores with D < 10 nm. The formation of the coarsely dispersed well-crystallized phase of a vanadium–titanium–phosphorus compound was detected.