双助剂对CuO/SiO_2催化甲醇乙醇合成异丁醛的影响  

Effect of Double Promoters on CuO/SiO_2 Catalyst for Synthesis of Isobutyraldehyde from Methanol and Ethanol

作　　者：刘翠改[1] 吴静[1] 王康军[1] 李海花[1] 

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142

出　　处：《石油化工》2011年第5期550-553,共4页Petrochemical Technology

基　　金：2010年辽宁省教育厅科研项目L2010440)

摘　　要：采用溶胶-凝胶法制备了CuO-Fe2O3-ZrO2/SiO2双助剂型催化剂,将其用于催化甲醇与乙醇一步合成异丁醛的反应,考察了助剂Fe2O3和ZrO2含量对催化剂性能的影响;采用BET,XRD,H2-TPR等手段对催化剂的结构进行了表征。实验结果表明,在CuO质量分数为20%时,适量加入助剂Fe2O3和ZrO2,可以使二者产生协同作用,一方面增大了催化剂的比表面积;另一方面促进了CuO的分散,改善了催化剂的还原性能,从而提高了催化剂的活性和异丁醛的选择性。以Fe2O3质量分数为20%、ZrO2质量分数为10%的CuO-Fe2O3-ZrO2/SiO2为催化剂,在常压、反应温度320℃、n(甲醇)∶n(乙醇)=2∶1的反应条件下,乙醇转化率为58.81%,异丁醛的选择性和收率分别为73.96%和43.50%。Double promoter catalysts CuO-Fe2O3-zrO2/SiO2 were prepared by sol-gel method and used in one-step synthesis of isobutyraldehyde from methanol and ethanol. Influence of the double promoters FeiO3and ZrO2 on the catalyst performance in the synthesis was investigated. The catalysts were characterized by means of BET, XRD and H2-TPR. The results showed that, at CuO mass fraction 20%, a synergetic effect between the double promoters could take place when the promoters Fe：O3 and ZrO2 were appropriately added to the CuO/SiO2 catalysts which would significantly increase their specific surface areas, promote dispersion of CuO and improve their reducibilities. The synergetic effect could not only increase the activities of the catalysts but also raise the selectivity to isobutyraldehyde. Under the optimal conditions of atmospheric pressure, reaction temperature 320 ℃ and mole ratio of methanol to ethanol 2 ： 1, the CuO-Fe2 O3-ZrO2/SiO2 with 20% （mass fraction） Fe2O3 and 10% （mass fraction） ZrO2 as catalyst, the conversion of ethanol, the selectivity and the yield of isobutyraldehyde were 58.81%, 73.96% and 43.50%, respectively.

关 键 词：甲醇 乙醇 异丁醛 助剂 氧化铜/二氧化硅催化剂 

分 类 号：TQ032.4[化学工程]