摘要
通过对一种ＦＣＣ催化剂水热稳定性的实验研究，揭示了催化剂酸性、分子筛破坏程度、晶胞常数和硅铝原子比等参数受水热处理条件影响的一些规律。发现温度在７５０～８００°Ｃ之间时催化剂的总酸量降低很快，而强酸与总酸之比随分子筛脱铝量的增多而增大；在８５０°Ｃ、样品处理时间大于４ｈ时，晶胞常数降到２．４２７ｎｍ，硅铝原子比增大到２０．１，剩下的酸基本上是强酸，而且分子筛的相对破坏程度达到６０％。
Severe conditions in regenerators of FCC processes are harmful to catalyst structure, activity, selectivity and life. Hydrothermal stability study is one of effective methods to learn the deteriorating mechanism of the catalysts. By studying the hydrothermal stability of a FCC catalyst, it is found that the total surface acid sites decrease sharply between 750 and 800C . The ratio of strong acid to total acid sites increases with the decrease of framework aluminum. At 850C when the steaming time reaches 4h, the unit cell size shrinks to 2.427nm and Si/Al ratio rises to 20.1. Most acid sites are strong in this situation and furthermore the relative damage degree of the zeolite is more than 60%.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第4期353-356,共4页
Journal of East China University of Science and Technology
