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Abstract
The aim of this work is to investigate the catalytic activity of Se-modified microgels in the heterogeneous oxidation of aromatic aldehydes. The study tested heterogeneous systems with organic solvent-to-water volume ratios of 1 : 4, 1 : 1, and 4 : 1. The dependence of benzoic acid yield on reaction temperature was examined across a range from 20 °C to 60 °C. It was established that the synthesized selenium-modified microgel catalysts with a 3D polymer structure enable a benzoic acid yield of 87.0 % (with selectivity of 89.4 %) in the heterogeneous oxidation of benzaldehyde with hydrogen peroxide, at a benzene-to-water ratio of 1 : 1 and a reaction temperature of 50 °C. The catalytic oxidation processes of several aromatic aldehydes – benzaldehyde, cinnamaldehyde, anisaldehyde, and veratraldehyde – were studied in a biphasic organic solvent/water system. The oxidation of aromatic aldehydes resulted in valuable products for the pharmaceutical and cosmetic industries, including aromatic acids, mequinol, hydrocoumarin, and 3,4-dimethoxyphenol. The synthesized Se-containing microgel catalysts enable mild process conditions, high yields, and high selectivity, which enhance process efficiency, reduce environmental impact, and improve the quality of the final product.
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