摘要
The Pd-Pb catalyst supported on Al2O3 was prepared by the two-step impregnation method.The oxidative esterification of methacrolein （MAL） to methyl methacrylate （MMA） was carried out in a stainless bubble autoclave over the catalyst.The influences of the reaction conditions on catalytic activity were investigated in detail.The optimal reaction conditions were as follows: T=80℃, P=0.3 MPa, methanol∶MAL=8∶1 （ molar ratio ）, catalyst mass concentration in the reaction system 3.84%, pH of the reaction system 7—8, oxygen flux rate 30 ml·min -1 .Under the above conditions,MAL conversion and MMA selectivity reached 91% and 84%, respectively.The catalyst was recycled for seven times and still kept good selectivity.
The Pd-Pb catalyst supported on Al2O3 was prepared by the two-step impregnation method. The oxidative esterification of methacrolein （MAL） to methyl methacrylate （MMA） was carried out in a stainless bubble autoclave over the catalyst. The influences of the reaction conditions on catalytic activity were investigated in detail. The optimal reaction conditions were as follows. T= 80℃, P=0. 3 MPa, methanol ： MAL=8 ： 1 （ molar ratio ）, catalyst mass concentration in the reaction system 3.84%, pH of the reaction system 7-8, oxygen flux rate 30 ml · min^-1. Under the above conditions, MAL conversion and MMA selectivity reached 91% and 84%, respectively. The catalyst was recycled for seven times and still kept good selectivity.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第6期1346-1350,共5页
CIESC Journal
基金
国家自然科学基金重点项目(20436050)
国家高技术研究发展计划重点项目(2004AA649240).~~
关键词
甲基丙烯醛
甲基丙烯酸甲酯
氧化酯化
methacrolein
methyl methacrylate
oxidative esterification
