Synthesis of MCM-48/ZSM-5 Composite Molecular Sieve by Two-step Crystallization

doi:10.3724/SP.J.1077.2009.00325

Abstract

Abstract: Composite micro/mesoporous MCM-48/ZSM-5 materials were successfully prepared by using a twostep synthesis route. The different structures of composite materials compared with the mechanical mixture were characterized by powder XRD，IR spectroscope，SEM，TEM，N₂ adsorption and the influence of the crystallization time was investigated. The results show that the composite MCM-48/ZSM-5 materials possess mesoporous wall constructed by secondary building units characteristic of ZSM-5 and threedimensional pore structure with pore size of about 2.6nm. The mesoporous framework of MCM-48/ZSM-5 is still found to be somewhat preserved after treatment in boiling water for 6h. It is proved that the selfassemble is a competitive process and the ratio of mesopore to micropore has a close relationship with crystallization time. The optimum crystallization time under 150℃ is 8h.

Key words: MCM-48/ZSM-5, composite micro/mesoporous molecular seives, crystallization time, hydrothermal stability, two-step synthesis

CLC Number:

TB332

ZHOU Zhi-Hua,LU Jin-Ming,WU Shu-Feng,ZHOU Jing-Lin,WANG Jin-Qu. Synthesis of MCM-48/ZSM-5 Composite Molecular Sieve by Two-step Crystallization[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00325.

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