Catalytic esterification of succinic acid with ethanol to obtain diethyl succinate (DES), a nontoxic plasticizer, is reported. Three sulfated zirconias supported on SBA-15 [SZ-SBA-15(X)] with Si/Zr molar ratios (X) of 10, 20, and 30 were synthesized and characterized. N₂ adsorption/desorption isotherms and X-ray diffraction patterns evidenced preservation of the ordered mesoporous structure of the catalysts after incorporation of Zr. Yields of DES greater than 85 % were obtained at the final reaction time by using SZ-SBA-15(10) and SZ-SBA-15(20) catalysts, which were higher than those achieved with Amberlyst 36. Reuse of the SZ-SBA-15(20) catalyst showed that, even though the structure of the support was preserved, decreases in sulfur concentration and in the DES yield occurred.

中文翻译：

---

使用 SBA-15 负载的硫酸氧化锆酯化琥珀酸

据报道，琥珀酸与乙醇的催化酯化反应得到琥珀酸二乙酯 (DES)，一种无毒的增塑剂。合成并表征了三种负载在 SBA-15 [SZ-SBA-15(X)] 上且 Si/Zr 摩尔比 (X) 为 10、20 和 30 的硫酸化氧化锆。N ₂吸附/解吸等温线和 X 射线衍射图证明在掺入 Zr 后催化剂的有序介孔结构得以保留。使用 SZ-SBA-15(10) 和 SZ-SBA-15(20) 催化剂在最终反应时间获得了大于 85% 的 DES 产率，高于使用 Amberlyst 36 获得的产率。 SZ-的再利用SBA-15(20) 催化剂表明，即使载体结构得以保留，硫浓度和 DES 产率也会降低。