Collect. Czech. Chem. Commun. 1995, 60, 505-513

Oxidation of Toluene by Air in the Presence of Oxygen Compounds on Vanadium Catalysts

Alexander Kaszonyia, Marcel Antola, Milan Hroneca, Gérard Delahayb and Danielle Ballivet-Tkatchenkob

a Department of Organic Technology, Slovak Technical University, 812 37 Bratislava, Slovak Republic
b Laboratoire de Chimie de Coordination, CNRS, 205 Route de Narbonne, 31077 Toulouse cedex, France


Addition of 10 - 30 vol.% of C1 - C4 alcohols, acetone, acetic acid or acetic anhydride to toluene increases several times the yield of benzaldehyde. The effect of these compounds over V2O5-K2SO4 catalysts supported on SiO2 is positive at molar ratio K2SO4 : V2O5 < 0.5. At the ratio K2SO4 : V2O5 ≥ 0.5 the effect is more complex and depends on the conditions used. In the case of V : Ag : K catalyst with the molar ratio 1 : 0.3 : 0.3, added compounds increase the yield of benzaldehyde, except 2-propanol. No effect of these additives was observed over H9PV6Mo6O40 catalyst supported on SiO2.