Studies on Dealuminated Faujasite Zeolites (Ⅳ)--Catalytic Cracking of Cumene

Abstract

Abstract: The cumene cracking activity on dealuminated faujasite zeolites was studied by using the pulse microreactor-chromatographic technique and correlated with their acidity which was measured by pyridine poising experiment under reaction conditions. It was shown that the cumene cracking activity on faujasites increased with increasing dealumination and reached a maximum at the Si/Al ratio 5. 38, then decreased with the Si/Al ratios increasing. While the active sites for cumene-cracking were decreased monotonously under reaction conditions, but were decreased slowly at a low dealumination. The rate constant k from kinetic research and the number of strong Bronsted acid sites changed in a similar peaky curve pattern. The maxima of two curves were on the same sample with Si/Al ratio about 8. 87.

Key words: Dealumination of faujasite, Si/Al ratio, Surface acidity, Catalytic cracking

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Xu Guo-lin, Xu Heng-yong, Sun Xi-xian, Tian Ying, Zhang Ying-zhen, Zheng Lu-bin. Studies on Dealuminated Faujasite Zeolites (Ⅳ)--Catalytic Cracking of Cumene[J]. Chem. J. Chinese Universities, 1991, 12(3): 368.

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Studies on Dealuminated Faujasite Zeolites (Ⅳ)--Catalytic Cracking of Cumene

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