Vanadyl pyrophosphate oxidation catalyst

摘要

Beta-silicon carbide particles impregnated with a vanadyl pyrophosphate oxidation catalyst are prepared by forming a heterogeneous reaction mixture of suspended vanadium (IV) phosphate (via hydrochloric acid digestion of V2O5 and H3PO4 in an aqueous solvent or via heating vanadium pentoxide with at least one substantially anhydrous unsubstituted alcohol having 1-10 carbon atoms, 1-3 hydroxyl groups and free from olefinic double bonds to form a feed of vanadium pentoxide reduced to a valence between 4 and 4.6, and then contacting the feed with a solution of orthophosphoric acid and at least one unsubstituted alcohol as described above), adding particulate beta-silicon carbide to the hererogeneous reaction mixture under agitation at moderated temperature between 40 DEG C and 120 DEG C, followed by drying, washing and calcining the particles thus formed.