复合氧化物WO_3-SnO_2催化合成己二酸

制备了复合氧化物催化剂WO3-SnO2用于催化H2O2氧化环己酮合成己二酸,适宜制备条件为n(WO3)∶n(SnO2)=1∶2,500℃焙烧3h,采用IR分析对其进行了表征。考察了催化剂用量、30%H2O2用量、反应时间及催化剂重复使用性等因素对己二酸收率的影响。己二酸适宜合成条件为:环己酮100mmol,催化剂1.25g,30%H2O250mL,回流反应5h,己二酸收率达82.5%。结果表明,复合氧化物WO3-SnO2的催化活性高于WO3。此外,若将WO3-SnO2进行镧改性后,催化活性虽不及WO3-SnO2,但可有效提高催化剂使用寿命。

Preparation of Complex Oxide WO3-SnO2 for Catalytic Synthesis of Adipic Acid

Complex oxide WO3-SnO2was prepared and employed as the catalyst for the synthesis of adipic acid from cyclohexanone with 30% hydrogen peroxide as oxidant.The appropriate preparing conditions were n(WO3)∶n(SnO2)=1∶2and calcinating at 500℃for 3h.The catalyst was characterized by IR technique.The effects of various factors such as catalyst dosage,hydrogen peroxide dosage,reaction time and reusability of the catalyst were investigated.The results indicated that the optimal reaction conditions were as follows:100mmol cyclohexanone,50mL 30% H2O2and 1.25g WO3-SnO2catalyst.The yield of adipic acid could reach 82.5%.Catalytic activity of WO3-SnO2complex oxide was superior to WO3.The catalytic activity of WO3-SnO2/La was less than WO3-SnO2,but its reusability was better than WO3-SnO2.