A SiO₂-SO₃H amorphous catalyst containing a small surface area of 115.0 m²g and 1.32 mmol H/g was prepared from fine construction sand and sodium carbonate and sulfonated with H₂SO₄. In a 10% (w/w) basis, it is very efficient for catalyzing the esterification of carboxylic acids with phenol. The reaction processes were performed using conventional heating and under microwave irradiation. The yields were higher in the microwave-irradiated esterification. The catalyst could be used for three esterification sequences in both processes.
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