VAPOR-PHASE OXIDATION OF 2-METHYLPYRIDINE ON V-Zr-O-CATALYSTS MODIFIED WITH TIN AND NIOBIUM OXIDES
Keywords:oxidation, 2-methylpyridine, catalyst, pyridine-2-aldehyde, picolinic acid, V-Zr-O-catalys, tin oxide, niobium oxide
Vapor-phase catalytic oxidation of pyridine alkyl derivatives is an effective method for obtaining a variety of physiologically active substances that are widely used in practice, as well as solvents, initial materials for the production of dyes, herbicides, etc. For the process, a cheap oxidizing agent is used - atmospheric oxygen. Of great importance is the choice and creation of an active and selective process catalyst. Basically, the oxidation processes are carried out in the presence of vanadium oxide catalysts. The purpose of this article was to study the behavior of V-Zr-O catalysts modified with tin and niobium oxides in the vapor-phase oxidation of 2-methylpyridine. It was shown that the composition of the catalyst determines the catalytic action in the studied process, affecting not only the activity of the catalyst but also the composition of the reaction products. By varying the conditions of the vapor-phase catalytic oxidation of 2-methylpyridine, such as temperature and the molar ratio of the initial substance: air oxygen: water, it is possible to obtain both oxygen-containing derivatives (pyridine-2-aldehyde and picolinic acid) and pyridine, a product of oxidative demethylation. It has been established that pyridine, one of the important products of vapor-phase oxidation of 2-methylpyridine, can be obtained with a yield of 85.3% on a V-Zr-O catalyst modified with niobium oxide.