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采用完全液相法制备了Cu-Zn-S i-A l浆状二甲醚合成催化剂,分析研究了其在浆态床合成气一步法合成二甲醚过程中的失活现象和机理.采用X射线粉末衍射、N2吸附测试、X射线光电子能谱以及元素分析等表征方法对催化剂使用前后的变化情况进行了分析.结果表明,完全液相法制备的Cu-Zn-S i-A l浆状催化剂的失活与传统方法制备的催化剂不尽相同,没有发现催化剂Cu晶粒的长大和比表面积降低等失活因素;催化剂失活与S i的存在有关,Cu组分的流失是其失活的主要原因.
The Cu-Zn-S iA l slurried dimethyl ether synthesis catalyst was prepared by a complete liquid phase method, and its inactivation phenomenon and mechanism during the one-step synthesis of dimethyl ether in a slurried-bed synthesis gas were analyzed. X-ray Powder diffractometry, N2 adsorption test, X-ray photoelectron spectroscopy and elemental analysis were used to analyze the changes before and after the catalyst was used.The results showed that the loss of Cu-Zn-S iA l slurry catalyst prepared by complete liquid phase method The catalysts prepared by living and traditional methods are not the same, and no inactivation factors such as the growth of Cu grains and the decrease of specific surface area are found. The deactivation of catalyst is related to the existence of Si, and the loss of Cu component is the main reason for its deactivation .