Аңдатпа
Modification of V 2 O 5 with Ti, Sn, Zr, Nb, and Al oxides improves the activity and selectivity of the vanadium oxide catalyst in vapor-phase oxidation of β-picoline to give nicotinic acid. It is shown that the conversion of β-picoline and the yield of nicotinic acid on two-component V 2 O 5 -TiO 2 , V 2 O 5 -SnO 2 , V 2 O 5 -ZtrO 2 , V 2 O 5 -Nb 2 O 5 , and V 2 O 5 -Al 2 O 3 catalysts may be several times those on the V 2 O 5 catalyst. It was found that, on passing from V 2 O 5 to double-component vanadium-containing catalysts, the proton affinity of active oxygen bonded to vanadium, calculated by the quantum-chemical method, grows simultaneously with the increase in the activity of the catalysts in the oxidation reaction.