焙烧温度对异辛醇生成异辛酸性能的影响

摘要

A series of ZnO/Al2O3 catalysts calcined at different temperature were prepared by incipient wetness impregnation.And the prepared catalysts were characterized by BET, XRD and SEM.The effect of calcined temperature on the catalyst properties and the relationship between catalyst properties and the activity were investigated.It was found that the catalyst particle size and surface area increased as the increasing calcined temperature.Spinel was found as the increasing of calcined temperature because Zn atom can inserted into γ-Al2O3 crystal lattice at high temperature.And the experimental results showed that the appearance of spinel plays an important role in the process.The reaction activity increased as the increasing of calcined temperature due to the formation of spinel.Sintering phenomenon was found when the calcined temperature exceeded 800 ℃ which decreased the dispersion and activity of the catalysts.%用浸渍法在不同焙烧温度下制备了一系列用于异辛醇氧化的ZnO/γ-Al2O3催化剂,通过BET,XRD和SEM等对其进行了表征,研究了焙烧温度对催化剂表面结构的影响以及催化剂表面结构与活性之间的关系.结果表明:升高焙烧温度,使催化剂晶粒尺寸增大,比较面积减小;Zn进入载体Al2O3的晶格形成AnAl2O4尖晶石晶相,其与催化剂的活性密切相关.催化剂活性随着焙烧温度升高而增强,焙烧温度800℃,催化剂具有最佳催化性能.当焙烧温度继续升高,催化剂烧结,比较面积下降,催化活性降低.