Abstract
The preparation, characterization, and catalytic properties of acid activated Indian bentonite (AAIB) are reported. AAIB has been characterized by XRD (basal spacing, 15.05 Å), specific surface area (273 m2/g), pore volume and pore diameter using BET method, TGA, SEM, and surface acidity by n-butylamine back titration method and infrared spectroscopy using pyridine as a probe molecule. The activity of Montmorillonite K10, ZrO2, S–ZrO2, p-toluenesulfonic acid (p-TSA), Indian bentonite (IB), and AAIB was investigated by the esterification of p-cresol with stearic acid. Among the catalysts, AAIB was found to be more active. The esterification of various carboxylic acids with phenols and alcohols was studied on AAIB to obtain corresponding esters in good yields. The regeneration and reusability of AAIB has also been investigated.
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Acknowledgements
This work was funded by the Department of Science and Technology, New Delhi, India, (Project No. SP/S1/H-38/98). The authors thank the members of the Governing Council of Bangalore Institute of Technology for the facilities provided. Thanks are also due to Sophisticated Instrumentation Facility, Indian Institute of Science, Bangalore, India, for 1H NMR spectra.
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Vijayakumar, B., Nagendrappa, G. & Jai Prakash, B.S. Acid Activated Indian Bentonite, an Efficient Catalyst for Esterification of Carboxylic Acids. Catal Lett 128, 183–189 (2009). https://doi.org/10.1007/s10562-008-9729-5
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DOI: https://doi.org/10.1007/s10562-008-9729-5