Abstract
<h2>Abstract</h2> In this paper, the metal oxide supports and active component precursors of SO<sub>4</sub><sup>2−</sup>/M<sub>x</sub>O<sub>y</sub> solid acid were screened, and S<sub>2</sub>O<sub>8</sub><sup>2</sup>‐<sup>−</sup>/Cr<sub>2</sub>O<sub>3</sub>-Fe<sub>2</sub>O<sub>3</sub> (S<sub>2</sub>-CrFe) was prepared. The NH<sub>3</sub>-TPD results showed that the solid acids loaded with S<sub>2</sub>O<sub>8</sub><sup>2−</sup> had stronger acidity than those loaded with SO<sub>4</sub><sup>2−</sup>, and the mixture of the two metal oxides could adjust the acidity of the solid acids. The optimum conditions for the preparation of S<sub>2</sub>-CrFe were as follows: the mass ratio of Cr<sub>2</sub>O<sub>3</sub> to Fe<sub>2</sub>O<sub>3</sub> was 1:1, the concentration of ammonium persulfate solution was 1 mol/L, and the calcination temperature was 550 °C. The yield of esterification catalyzed by the solid acid obtained under these conditions was 91.2%. The stability of the new solid acid was investigated, and it was found that S<sub>2</sub>-CrFe was easy to be deactivated, so it was considered to be modified by organosilane and lanthanum oxide. The experimental results showed that after the modified solid acid was recycled for four times, the yield of ethyl acetate was more than 60%.
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