A new solid acid catalyst SO₄²⁻/ZrO₂‐CeO₂ (SZC) was prepared by co‐precipitation method and used in biodiesel production. Different from considering several parameters in available literatures, the effect of all 10 parameters in the preparation process on the catalytic activities of SZC were studied systematically and comprehensively. The catalytic performance was tested by the conversion of Jatropha oil fatty acids (CFA) in esterification. TG, XRD, BET, TEM, NH₃‐TPD, FTIR were used to characterize the catalyst aiming to analyze the influence mechanisms of each factor. The results indicated that the surface area and acidity of sulfated zirconia increased by doping of Ce. The most important preparation parameters included loading amounts of CeO₂, aging time, and calcination temperature, their proper values were 5%, 21 h, 773 K, respectively. Moreover, novel findings included: the ammonia concentration influences the acid strength of catalyst which was more important than the amount of acid sites for the catalytic activities and drying before calcination was a necessary step.

中文翻译：

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制备参数对固体酸催化剂SO42- / ZrO2-CeO2在生物柴油生产中催化性能的影响▴

通过共沉淀法制备了一种新型的固体酸催化剂SO ₄ ^2- / ZrO ₂ -CeO ₂（SZC），并将其用于生物柴油生产。不同于现有文献中考虑几个参数的方法，系统地，全面地研究了制备过程中所有十个参数对SZC催化活性的影响。通过在酯化反应中麻疯树油脂肪酸（CFA）的转化来测试催化性能。TG，XRD，BET，TEM，NH ₃‐TPD，FTIR用来表征催化剂，旨在分析每个因素的影响机理。结果表明，铈的掺杂增加了硫酸锆的表面积和酸度。最重要的制备参数包括CeO _2的负载量，时效时间和煅烧温度，它们的适当值分别为5％，21 h和773K。此外，新发现包括：氨浓度影响催化剂的酸强度，这比酸位的数量对催化活性更重要，在煅烧之前干燥是必要的步骤。