K/SiO_2催化醋酸甲酯与甲醛合成丙烯酸甲酯  

Synthesis of Methacrylate From Methyl Acetate with Formaldehyde Over K/SiO_2 Catalyst

作　　者：高伟伟[1,2] 陈光辉[1,2] 李建隆[1,2] 

机构地区：[1]青岛科技大学化工学院,山东青岛266042 [2]生态化工国家重点实验室,山东青岛266042

出　　处：《当代化工》2016年第11期2500-2504,共5页Contemporary Chemical Industry

基　　金：国家自然科学基金(21276132)

摘　　要：以K/Si O_2为催化剂,利用醋酸甲酯与甲醛合成丙烯酸甲酯,分别考察了活性组分来源、负载量、浸渍条件以及催化剂焙烧温度对反应的影响。研究结果表明:采用硝酸钾作为钾源,催化剂具有较好的性能,醋酸甲酯的转化率为19.94%,丙烯酸甲酯收率为4.56%。K负载量低于15%时,增加负载量有利于提高催化活性,负载量为15%时,催化活性最高,醋酸甲酯转化率为23.5%,丙烯酸甲酯收率为6.8%。此外,浸渍条件和焙烧温度对催化剂性能也有较大的影响,超声浸渍可以提高活性组分在载体表面的分散度,有利于催化活性的提高;升高焙烧温度可以促进硝酸钾的分解,增强催化剂碱性强度,提高催化活性。Methacrylate was synthesized from methyl acetate and formaldehyde over K/SiO2 catalyst. Effect of source of K, K loading on catalyst, impregnation conditions and calcination temperature of catalyst on the reaction was investigated. The results showed that if KNO3 was used as the source of K, the activity of catalyst would be better, the conversion of methyl acetate was 19.94%, the yield of methacrylate was 4.56%. When K loading was lower than 15%, the increase of K loading on catalyst was beneficial to improve the catalytic activity, and the best K load was 15%, the conversion of methyl acetate was 23.5%, the yield of methacrylate was 6.8%. It also showed that impregnation conditions and calcination temperature had great influence on catalyst activity. Ultrasonic can improve the dispersion of active component on the surface of the carrier, and enhance the activity of catalyst. Raising the calcination temperature can promote the decomposition of KNO3. At the same time, the base intensity of the catalyst would be enhanced, and the activity of catalyst would be also enhanced.

关 键 词：醋酸甲酯 甲醛 丙烯酸甲酯 超声震荡 焙烧温度 

分 类 号：TQ201[化学工程—有机化工]