Fe^(3+)、Ce^(4+)掺杂改性对SO_4^(2-)/TiO_2固体超强酸催化尿囊素催化性能的研究

Study on SO_4^(2-)/TiO_2 Doped by Fe^(3+)and Ce^(4+) in the Synthesis of Allantion

采用液相浸渍的方法对SO42-/TiO2进行Fe、Ce双元素掺杂改性,以合成尿囊素产率大小为判断标准,考察通过掺杂改性后的催化剂催化性能,优化制备催化剂的工艺条件。结果表明,当Ce4+:TiO2=0.06%、Fe3+:TiO2=0.2%,浸渍溶液是硫酸,浸渍浓度为0.66 mol.L-1,浸渍溶液的体积为15 mL/g,浸渍时间为20 h,焙烧温度540℃,焙烧时间3.4 h,尿囊素的产率最高,催化活性最佳,可重复使用4次以上,重复实验得到的尿囊素平均产率基本维持在65%左右。制得的尿囊素进行产品鉴定,符合工业标准。

The solid superacid SO4^2-/TiO2 is modified by Fe^3＋and Ce^4＋ doping in the impregnation method.The catalysis of the solid superacid is investigated after doping.The preparation conditions of catalysis are optimized to increase the yield of the allantoin.The results show that,when Ce4＋：TiO2=0.06% and Fe^3＋：TiO2=0.2%,the dipping solution is sulfuric acid,its concentration is 0.66 mol·L^-1,the impregnating solution volume is 15 mL/g,the soaking time is 20 h,the calcination temperature is 540 ℃ and the baking time is 3.4 h,the yield of allantoin is the highest and the catalytic activity is the best.The average yield of allantoin is basically maintained 65% by reusing four times over and allantion obtained consistent with industry standards.