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5.失活和中毒机理分析工业催化剂使用一段时间之后就要再生,再生后,催化剂还有一定寿命。随着使用时间的增加,活性逐步下降,最后失活。催化剂为什么会失活?电子能谱技术是提供这方面研究的一种重要手段。 (1)汽油加氢一段催化剂Pd/Al_2O_3 此催化剂使用寿命为两年,但使用一段时间后活性下降,用高压蒸汽冲洗后活性稍有好转,但几个月后,高压蒸汽冲洗多次也没有用,完全失活了。XPS分析给出图13。它表明:a.活性下降的催化剂,表面含炭量比新鲜催化剂几乎
5. Inactivation and poisoning mechanism analysis Industrial catalyst will be regenerated after a period of time, regeneration, the catalyst has a certain life expectancy. With the use of time increases, the activity decreased gradually, and finally inactivated. Why the catalyst is inactivated? Electron spectroscopy is an important means to provide research in this area. (1) Pd / Al 2 O 3 catalyst for hydrogenation of gasoline This catalyst has a useful life of two years but its activity decreases after a period of use. After a long period of time, the activity of the catalyst is slightly improved. However, after several months, Use, completely inactivated. XPS analysis gives Figure 13. It shows that: a. Activity of the catalyst, the surface carbon content than the fresh catalyst almost