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Nanoscience & Nanotechnology-Asia

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ISSN (Print): 2210-6812
ISSN (Online): 2210-6820

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Research Article

Sulfonic Acid Functionalized Precipitated Silica as Efficient Solid Acid Catalyst for Acetylation Reactions

Author(s): Mayura Lolage, Manohar G. Chaskar* and Anirban Ghosh*

Volume 13, Issue 1, 2023

Published on: 17 April, 2023

Article ID: e160323214694 Pages: 9

DOI: 10.2174/2210681213666230316144347

Price: $65

Abstract

Introduction: Precipitated Silica has very high commercial significance in terms of ease of preparation, market volume, cost benefits and a wide range of industrial applications. The surface silanol groups of Precipitated Silica can be modified with reactive organic functional groups to achieve desired properties for specific applications, including catalysis.

Objective: The objective of this study is to demonstrate sulfonic acid functionalized Precipitated Silica as a true heterogeneous catalyst in acetylation reaction, where the catalytic activity and desired product selectivity is a magnitude higher than industrial solid acid zeolite catalysts as well as similar catalysts reported in literature.

Methods: A novel and cost-effective method for the functionalization of Precipitated Silica with sulfonic acid (-SO3H) is reported, where the silica nanoparticles are first functionalized in situ with a tetrasulfide organosilane, followed by oxidation of the tetrasulfide moiety to -SO3H groups, which are grafted to the surface silanol groups through covalent linkage.

Results: CHNS analyses and XPS prove successful functionalization of -SO3H group onto the nano silica surface. The resultant material acts as a solid acid catalyst and shows exceptional activity in the acetylation of benzyl alcohol and >99% selectivity towards the desired product benzyl acetate. The resultant material can also be recycled and reused several times.

Conclusion: The following factors make sulfonic acid functionalized Precipitated Silica a new generation of solid acid catalyst; (i) higher atom economy, (ii) recyclability and reusability, and (iii) significant cost benefits with respect to industrial catalysts.

Graphical Abstract

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