ZEOLITE SUPPORTED V2O5: POTENTIAL CATALYTIC APPLICATION IN OXIDATIVE ESTERFICATION OF AROMATIC ALDEHYDES

Abstract

The direct oxidative esterification reaction of aldehydes is a conceptually and economically attractive approach and, therefore, has received increasing attention. The improvement of a one pot oxidative esterification of aldehydes under heterogeneous catalytic conditions that reduce jeopardy wastes is extremely required from both commercial and environmental points of view. Amongst the reported schemes heterogeneous catalysts are favored due to their simplistic reclamation, less contagion of the product and effective reusability. Recently, extensive and intensive studies have been made on the heterogeneously catalyzed oxidative esterification of aldehydes. Furthermore, V2O5/CBV400 complexes catalyzed esterification of aromatic aldehydes under heterogeneous conditions with H2O2 has been explored in this study. In this research, preparation of the catalyst in different weight ratios, screening it, characterized it using XRD, BET, FT-IR, SEM, TGA techniques, application of the catalyst including optimization, substrate scope, and reusability of the catalyst have been investigated. Methods used for both catalyst synthesis and organic transformation were reflux method and the product obtained from the transformation of aldehyde was 95% at optimized level of reaction condition (at 85℃, 20% catalyst, 16ml methanol solvent, 0.4ml H2O2 oxidant and 3 & half hours). Also recycled the catalyst five rounds and the last cycle has produced 84% yield. FT-IR and NMR characterization of the as synthesized organic compound (methyl benzoate) was investigated.