中文摘要：

以完全液相法制备的Si-Al基二甲醚合成催化剂为研究对象,运用XRD、TEM、XPS以及XRF等方法对失活催化剂的表面结构和性质进行表征,并与传统催化剂进行对比,探讨影响催化剂寿命的本质原因。研究结果表明,传统复合催化剂失活的主要原因是反应过程中Cu组分的烧结、团聚以及催化剂比表面积降低等;而Si-Al基完全液相法催化剂失活是由于Cu组分流失所致。

英文摘要：

In recent years,much attention has been paid to slurry dimethyl ether synthesis technology due to its advantages in heat transfer,isothermal condition and efficient energy utility.However,the catalyst stability is a bottle-neck to restrict the commercial application.This paper studied the structure and physicochemical properties of Si-Al based catalyst prepared by the complete liquid-phase method.The catalysts were characterized by XRD,TEM,XPS and XRF technics,and then contrasted with traditional hybrid catalyst.The results indicated that there were different reason in their deactivation.Hybird catalyst deactivation was caused by Cu sintering,gathering and specific surface area decreasing.For Si-Al based slurry catalyst,the Cu loss during the reaction was an important reason leading to deactivation.