SO42-/ZrO2-Nd2O3固体酸的制备及其催化活性

摘要

SO42−/ZrO2-Nd2O3 solid acid was prepared by using collagen fibers as template, zirconium sulfate as zirconium source and doping with rare earth element Nd. The as-prepared SO42−/ZrO2-Nd2O3 were characterized by TG, XRD, FT-IR、SEM and N2 adsorption-desorption analysis so as to investigate the influence of preparation conditions on the catalyst structure. The results reveal that the fibrous structures of collagen fibers are preserved in the SO42−/ZrO2-Nd2O3 solid acid. The growth of the ZrO2-Nd2O3 particles can be efficiently suppressed by Nd doping. The diameters of ZrO2-Nd2O3 particles are distributed in the range of 5.1~11.6 nm. The BET surface area of SO42−/ZrO2-Nd2O3 solid acid is 63.96 m2/g. The esterification of acetic acid with n-butanol was carried out as a model reaction to calculate the catalytic properties of SO42−/ZrO2-Nd2O3 solid acid. The SO42−/ZrO2-Nd2O3 solid acid exhibits high catalytic activity. Furthermore, the conversion rate of acetic acid can reach 85%in the fifth cycle, which showsthe satisfied reusability, thus showing a potential industrial application.%以皮胶原纤维为模板剂，硫酸锆为锆源，掺杂稀土Nd元素制备SO42−/ZrO2-Nd2O3固体酸。通过TG、XRD、FT-IR、SEM以及N2吸附脱附分析等表征了制备条件对SO42−/ZrO2-Nd2O3固体酸结构的影响。结果表明，SO42−/ZrO2-Nd2O3固体酸较好地保持了模板的纤维结构，添加稀土Nd元素能有效抑制晶粒增长，ZrO2-Nd2O3晶粒尺寸为5.1～11.6 nm，比表面积为63.96 m2/g；以乙酸和正丁醇的酯化反应为模型反应考察SO42−/ZrO2-Nd2O3固体酸的催化活性，催化剂活性较高，重复使用5次，乙酸的转化率仍可达到85%，表现出较好的重复使用性，具有一定的工业应用前景。