甲基丙烯酸甲酯合成中VPO催化剂活性的研究  

The Study of VPO Catalysts Activity in the Methyl Methacrylate Synthesis Process

作　　者：谢颖[1] 肖林久[1] 王宜阳[1] 邢志强[2] 

机构地区：[1]沈阳化工学院,辽宁沈阳110142 [2]辽宁大学化学系,辽宁沈阳110036

出　　处：《当代化工》2005年第2期130-132,136,共4页Contemporary Chemical Industry

摘　　要：研究了催化剂V_2O_5-P2O5/SiO2的制备,并对其结构、性能进行了表征。通过甲基丙烯酸甲酯的催化合成过程,对该催化剂的活性进行了考察。解释和分析了催化剂的制备、组成及反应条件等因素对其活性及甲基丙烯酸甲酯合成的影响。实验结果给出常压下气固相催化合成甲基丙烯酸甲酯效果较好的催化剂V2O5-P2O5/SiO2的制备条件:V/P摩尔比为1∶2.8,活化温度为450℃,浸渍时间3h。实验结果还给出常压下催化剂V2O5-P2O5/SiO2催化合成甲基丙烯酸甲酯效果较优的反应条件:在空速1500h-1,反应温度300℃,丙酸甲酯/甲缩醛摩尔比为1.6∶1的条件下进行常压反应,所得甲缩醛转化率为86.7%,甲基丙烯酸甲酯的选择性为66.2%,收率为57.40%。In order to obtain the optimized catalytic effect and reaction condition of the methyl methacrylate synthesis, the preparation of catalyst V_2O_5-P_2O_5/SiO_2 was studied. The structure and performance of the catalyst was showed. The catalyst activity was examined by synthesizing methyl methacrylate. The preparation effect, composition of catalyst and reaction conditions of methyl methacrylate synthesis were explained and analyzed. The optimum catalytic conditions:V/P=1∶2.8, the active temperature is 450 ℃, the time of dipping is 3 h. The reaction conditions:GHSV=1 500 h -1 , the reaction temperature is 300 ℃, n (MMA)/ n (methylal)=1.6∶1. And the conversion of methylal is 86.7 %, the option of methyl methacrylate is 66.2 %, the yield of methyl methacrylate is 57.40 %.

关 键 词：甲基丙烯酸甲酯 偏钒酸铵 催化剂 

分 类 号：TQ225.24[化学工程—有机化工]