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Solid superacid SO42−/ZrO2-SiO2 was prepared by dip-impregnation method, and its catalytic activity was tested with esterification of p-nitrobenzoic acid and methanol. The optimum conditions were also found, that is, the molar ratio between silica and zirconia was 10:1, the calcination temperature was 550 °C and the soaked consistency of H2SO4 was 1.0 mol·L−1. Under the conditions that the ratio...
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