Optimization of vanadium oxide catalyst for the oxidation of 3-methylpyridine into nicotinic acid

Pavel Vorobyev, Tatyana Mikhailovskaya, Olga Yugay, Lyudmila Saurambaeva, Anna Serebryanskaya, Nikolay Chukhno, Raya Kurmakyzy
2017 Journal of the Serbian Chemical Society  
Upon modification of V 2 O 5 with SnO 2 or ZrO 2 , increase in the activity and selectivity of the vanadium-oxide catalyst in the vapor-phase oxidation of 3-methylpyridine into nicotinic acid were observed. It was shown that the promoting effects of SnO 2 and ZrO 2 were the result of increases under their influence of the proton affinity of the vanadyl oxygen and decreases in the enthalpy of deprotonation of the methyl group of the substrate, connected by a nitrogen atom with the Lewis acidic
more » ... the Lewis acidic center (vanadium ion). The given characteristics were calculated by the density functional theory quantum-chemical method. Modification of binary V 2 O 5 -SnO 2 and V 2 O 5 -ZrO 2 -catalysts by TiO 2 addition resulted in a further increase in the nucleophility of the vanadyl oxygen and, as a consequence, an increase in the catalytic activity and selectivity for nicotinic acid formation.
doi:10.2298/jsc161220023z fatcat:h72m4wplgrhqpabbzkp7hmlnhy