采用共沉淀-浸渍法制备了固体超强酸S2O82-/ZrO2-Al2O3催化剂,并加入La对催化剂进行改性.以柠檬酸三丁酯的合成为探针反应评价催化剂的活性,并通过红外光谱、X射线衍射、NH3程序升温脱附等方法对催化剂进行表征,考察制备条件及La的引入对催化剂结构和性能的影响.结果表明:(NH4)2S2O8溶液浸渍浓度为0.5 mol/L,锆铝氧化物物质的量比为1∶1,600℃焙烧4h后于1％(质量分数)的La(NO3)3溶液浸渍所得的催化剂活性较好,柠檬酸的转化率可达93.69％.La的引入可以提高催化剂对S2O82-的结合能力,抑制活性组分的分解,增加催化剂的酸强度和酸总量,提高催化剂的活性.
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