Mesoporous SBA 15 based solid acid catalysts for fine chemical synthesis

Abstract

Catalysis, a fundamental concept in chemistry. It plays a critical newlinerole in the chemical industry, significantly impacting human well-being newlineand stimulate economic growth. Catalysis enables the efficient and newlinesustainable production of chemicals, fuels, and materials. Catalysts speeds newlineup reaction rates and enhances selectivity by reducing the activation newlineenergy needed for reactions. Many catalytic reactions operate under mild newlinereaction conditions. Catalysis has precise control over reaction pathways newlineand product distributions, leading to higher selectivity. The continued newlinedevelopment of catalytic processes and materials holds promise for newlineadvancing technology and addressing global challenges. In this study, we synthesized mesoporous SBA-15 using a templateassisted hydrothermal method. Then SBA-15 is functionalized with newlinesulphonic acid group via post grafting method, (SSA(G) and co-condensation newlinemethod (SSA). Phosphotungstic acid was then immobilized into newlinesulphonic acid functionalized SBA-15 (HPW/SSA) by wet impregnation newlinemethod. All the prepared catalytic systems were well characterized by newlinedifferent analytical techniques. Sulphonic acid functionalized SBA-15 newlinewas employed for the synthesis of 2-arylbenzimidazoles and benzothiazoles newlineunder ambient conditions. Considering the exceptional performance of newlinebifunctional catalytic systems, an attempt was directed towards integrating newlinephosphotungstic acid into sulphonic acid functionalized SBA-15 to obtain newlineHPW/SSA. The catalytic performance of the as prepared systems were newlinescreened for the synthesis of 1,2,4 and imidazoles, visible light assisted newlinesynthesis of bis(indolyl)methanes, Paal-Knorr synthesis of pyrrole newlinederivatives and 2,3-Dihydroperimidines etc. Various reaction parameters newlinewere investigated and reaction conditions were optimized in all cases. The newlinereusability of all the catalytic systems were also checked. newline