OXIDATION OF TOLUENE BY AIR IN THE PRESENCE OF OXYGEN COMPOUNDS ON VANADIUM CATALYSTS

Addition of 10 - 30 vol.% of C-1 - C-4 alcohols, acetone, acetic acid or acetic anhydride to toluene increases several times the yield of be nzaldehyde. The effect of these compounds over V2O5-K2SO4 catalysts su pported on SiO2 is positive at molar ratio K2SO4 : V2O5 < 0.5. At the ratio K2SO4 : V2O5 greater than or equal to 0.5 the effect is more com plex and depends on the conditions used. In the case of V : Ag : K cat alyst with the molar ratio 1 : 0.3 : 0.3, added compounds increase the yield of benzaldehyde, except 2-propanol. No effect of these additive s was observed over H9PV6Mo6O40 catalyst supported on SiO2.