摘要
在CuOZnO/Al2O3催化剂上,甲醇与乙醇在常压和210~360℃温度下一步反应合成异丁醛.利用正交设计方法,研究了CuOZnO/Al2O3体系催化剂组成和制备条件等因素对催化剂催化性能的影响.结果表明,催化剂中CuO含量对催化剂的催化活性影响最大,而ZnO含量则主要影响催化剂对异丁醛的选择性.催化剂制备条件,如沉淀温度、陈化时间等,也不同程度地影响催化剂的催化性能.XRD和BET表征结果表明,催化剂的晶相及比表面积与催化剂制备条件直接相关.对异丁醛合成反应机理进行了探讨,认为乙醇主要在CuO中心上吸附、脱氢,然后在ZnO中心上与甲醇缩合、脱水生成异丁醛.
Isobutyraldehyde was synthesized in one step from methanol and ethanol over CuO ZnO/Al 2O 3 catalysts at atmospheric pressure and at temperature range of 210~360℃. The orthogonal method was applied to investigate the chemical composition and the preparation conditions of the catalysts. It was found that the catalytic activity and selectivity of the catalysts strongly depend on CuO content while ZnO might play an important role in the formation of isobutyraldehyde. The catalysts, which were precipitated at higher temperature ( e.g. 80℃) and aged for a longer time (e.g. 2 5 h) seem to be more active and selective. The mechanism for isobutyraldehyde formation was also discussed. CuO might act as active centers. Ethanol is mainly adsorbed and dehydrogenated on Cu centers to acetaldehyde. And then, it is condensated with methanol and dehydrated on ZnO centers to produce isobutyraldehyde.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1998年第6期546-549,共4页
基金
水煤浆气化及煤化工国家工程研究中心资助
关键词
甲醇
乙醇
异丁醛
铜
锌
氧化铝
一步法
催化剂
Methanol, Ethanol, Isobutyraldehyde, Copper oxide, Zinc oxide, Alumina