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Effect of sequential desilication and dealumination on catalytic performance of ZSM-5 catalyst for pyridine and 3-picoline synthesis

Published online by Cambridge University Press:  31 January 2011

Fang Jin ,
Yugang Cui ,
Zebao Rui  and
Yongdan Li
Fang Jin*
Affiliation:
Tianjin Key Laboratory of Applied Catalysis Science and Technology, and State Key Laboratory for Chemical Engineering, School of Chemical Engineering, Tianjin University, Tianjin 300072, China; and Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical and Pharmaceutical Engineering, Wuhan Institute of Technology, Wuhan 430073, China
Yongdan Li*
Affiliation:
Tianjin Key Laboratory of Applied Catalysis Science and Technology, and State Key Laboratory for Chemical Engineering, School of Chemical Engineering, Tianjin University, Tianjin 300072, China
*
a)Address all correspondence to this author. e-mail: fangjin@mail.wit.edu.cn
b)Address all correspondence to this author. e-mail: ydli@tju.edu.cn
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Abstract

A sequential procedure of alkaline treatment followed by SiCl4 or hydrothermal treatment has been investigated to obtain a tailored ZSM-5 catalyst for the synthesis of pyridine bases. The major function of alkaline treatment is desilication; however, it is accompanied by the extraction of framework aluminum, which formed the extra-framework alumina and amorphous alumina by realumination. Moreover, a large number of intracrystalline meso- and macropores and silanol groups are created. The desilication and realumination cause the ratio of Lewis acid sites to Brönsted acid sites (L/B) to increase. The subsequent SiCl4 or hydrothermal dealumination increases both L/B ratio and acid strength. The introduced hierarchical pores and changed acid strength distribution by the alkaline treatment improve the stability of the catalysts; the generated stronger acid sites by dealumination benefits the yields of pyridine bases; and the increased L/B by the sequential treatment promotes the selectivity of pyridine over 3-picoline.

Keywords

ZeolitePorosityCatalytic

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Articles
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Journal of Materials Research , Volume 25 , Issue 2 , February 2010 , pp. 272 - 282
Copyright
Copyright © Materials Research Society 2010

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