Prediction of cracking catalyst behavior by a zeolite unit cell size model
Prediction of cracking catalyst behavior by a zeolite unit cell size model
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DOI：
10.1016/0021-9517(84)90235-5
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发表时间：
1984-02
影响因子：
7.3
通讯作者：
L. A. Pine;P. Maher;W. A. Wachter
中科院分区：
文献类型：
--
作者：
L. A. Pine;P. Maher;W. A. Wachter
对金属、氢交换Y和USY分子筛裂化催化剂的性能进行了实验和理论研究。从实验程序中，获得了沸石稳定性以及催化剂活性和选择性的数据。使用一个新的理论框架沸石酸性，它被发现，这些数据可以与一个单一的参数，单位电池常数的蒸汽失活催化剂。晶胞常数是沸石晶体结构中实际上二氧化硅与氧化铝之比的量度。该比率是酸位点密度的量度，其决定酸强度分布并最终影响活性和选择性。这些数据清楚地表明，活性和选择性的变化，导致从各种沸石预处理，如阳离子交换，酸萃取，和水热调理可以解释在它们对沸石细胞常数的影响。碱含量对具有相同晶胞常数的催化剂性能的影响是酸中心分布理论的一个逻辑扩展。
An experimental and theoretical study of the behavior of metal, hydrogen-exchanged Y and USY zeolite cracking catalysts has been conducted. From the experimental program, data on zeolite stability as well as catalyst activity and selectivity were obtained. Using a new theoretical framework for zeolite acidity, it was found that these data could be correlated against a single parameter, the unit cell constant of the steam deactivated catalyst. The cell constant is a measure of the silica to alumina ratio actually in the zeolite crystal structure. This ratio is a measure of acid site density which determines the acid strength distribution and ultimately affects activity and selectivity. The data clearly show that activity and selectivity changes resulting from various zeolite pretreatments such as cation exchange, acid extraction, and hydrothermal conditioning can be explained in terms of their effect on the zeolite cell constant. A logical extension of the acid site distribution theory is demonstrated by the influence of soda level on the performance of catalysts having the same cell constant.