VAPOR-PHASE OXIDATION OF 2-METHYLPYRIDINEON V-Zr-O-CATALYSTS MODIFIED WITH TIN AND NIOBIUM OXIDES

Abstract

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 for the synthesis of solvents, starting 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 catalysts based on vanadium oxide with the addition of transition metal oxides. The aim of the work.Study of the behavior of V-Zr-O catalysts modified with tin and niobium oxides in the vapor-phase oxidation of 2-methylpyridine. Metodology. Vapor-phase oxidation of 2-methylpyridine was carried out in a flow-type reactor simulating an element of an industrial contact apparatus. The reaction products were analyzed by chromatographic method. Results and disscution. It was shown that the component composition of the contact 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, the molar ratio of the initial substance:О2:Н2О, it is possible to obtain both oxygen-containing derivatives (pyridine-2-aldehyde and picolinic acid) and pyridine, a product of oxidative demethylation. Conclusion.It has been established that pyridine, which is one of the important products of the vapor-phase oxidation of 2-methylpyridine, can be obtained in 85.3% yield on a V-Zr-O catalyst modified with niobium oxide.