Abstract
The surface of commercially available silica gel, 60–200 mesh size, was modified with sulfonic acid through surface activation, grafting of 3-Mercaptopropyltrimethoxysilane, oxidation and acidification of 3-Mercaptopropylsilica. Sulfonic Acid Functionalization of Silica (SAFS) was confirmed by Fourier Transform Infra-red (FTIR) spectroscopy and thermal gravimetric analysis. Acid–base titration was used to estimate the cation exchange capacity of the SAFS. Catalytic activity of SAFS was judged for the esterification of ethanol with maleic acid. An effect of different process parameters viz. molar ratio, catalyst loading, speed of agitation and temperature were studied and optimized by Box Behnken Design (BBD) of Response Surface Methodology (RSM). Quadratic model developed by BBD–RSM reasonably satisfied an experimental and predicted values with correlation coefficient value R2 = 0.9504.
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Authors thanks to Ministry of HRD, Govt. of INDIA, New Delhi for financial support under TEQIP-II program.
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Sirsam, R., Usmani, G. Preparation and Characterization of Sulfonic Acid Functionalized Silica and Its Application for the Esterification of Ethanol and Maleic Acid. J. Inst. Eng. India Ser. E 97, 75–80 (2016). https://doi.org/10.1007/s40034-015-0068-y
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DOI: https://doi.org/10.1007/s40034-015-0068-y