An Environmentally Benign Solid Acid Nanocatalyst for the Green Synthesis of Carboxylic Acid Ester

Green and sustainable chemistry have gained substantial attention worldwide, and the efforts have been greatly appreciated for the substitution of Brønsted acid catalysts from homogeneous to heterogeneous phases. In this perspective, a sulfonic acid‐functionalized silica nanospheres (SAFSNS) catalys...

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Bibliographic Details
Published in:ChemistrySelect (Weinheim) 2021-09, Vol.6 (36), p.9645-9652
Main Authors: Ahmad, Irshad, Shagufta, Dhar, Rahul, Hisaindee, Soleiman, Hasan, Kamrul
Format: Article
Language:English
Subjects:
Esterification
Heterogeneous catalysis
Silica nanospheres
Solid acid nanocatalyst
Supported catalysts
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Summary:Green and sustainable chemistry have gained substantial attention worldwide, and the efforts have been greatly appreciated for the substitution of Brønsted acid catalysts from homogeneous to heterogeneous phases. In this perspective, a sulfonic acid‐functionalized silica nanospheres (SAFSNS) catalyst was prepared by organosilylation‐sulfonation on the surface of well‐ordered silica nanospheres as a heterogeneous nanocatalyst. The physicochemical properties of nanocatalyst were well characterized by powder XRD, IR, TGA, DSC, NH3‐TPD, N2 sorption, EDAX, and SEM techniques. The attainment of the anchoring of SO3H functionalization involving the Brønsted acidities was found up to 0.35 mmol H+/g. The synthesized SAFSNS nanocatalyst ascertain the replacement of the highly toxic liquid phase acids to a stable, solid acid catalyst for the green esterification of carboxylic acids under solvent‐free reaction conditions, showed reasonable to excellent esters yield (63–94 %) in 3.5 hours at 100 °C with five times reusability without substantial diminution in catalytic proficiency. An efficient, reusable, and environmentally benign solid acid nanocatalyst substitutes exceedingly toxic fluid acids utilized in solvent‐free reaction conditions to synthesize carboxylic acid ester. The research work synthesizes a sulfonic acid‐functionalized nanocatalyst by the organosilylation‐sulfonation on the surface of silica nanospheres as a heterogeneous nanocatalyst with excellent catalytic performance.
ISSN:2365-6549
2365-6549
DOI:10.1002/slct.202102230