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Abstract
A series of ZSM-5/γ-Al 2 O 3 composite materials were prepared under various pretreatment method; The physicochemical properties of composite materials were investigated by XRD, SEM, FTIR to find out optimal pretreatment method. The results showed that the composite materials performance better structure property when γ- Al 2 O 3 was firstly immersed in TPAOH solution under reflux condensation for a period of time and then immersed into anhydrous alcohol before mixed with ZSM-5 precursor solution. The result of infrared spectrum indicated that the formation of Al-OH bond played a key role in the synthesis of micro-mesoporous ZSM-5/γ-Al 2 O 3 composite materials.
Highlights
Micro-mesoporous materials have interconnected pores with double model pore distribution of micropore and mesopore combined the advantages of mesoporous materials and the strong acidity and high thermal stability of microporous molecular sieves[1,2,3,4]
The patterns of Samples YFA1 showed the characteristic reflection peak of ZSM-5, the four strongest diffraction peak of Ȗ-Al2O3 were observed and there was a diminution of Ȗ-Al2O3 peaks intensities with enhancement of the ZSM-5 peaks, suggesting micro-mesoporous materials ZSM-5/Ȗ-Al2O3 could be synthesized under pretreatment methods A1. it can be seen that pretreatment method had a great influence on the synthesize of the composite materials and the product crystallization
In view of X-ray diffraction (XRD) patterns, we can preliminarily estimate the materials were ZSM-5 crystal. This fully proved that ZSM-5/Ȗ-Al2O3 composite materials could be synthesized under pretreatment method A1
Summary
Micro-mesoporous materials have interconnected pores with double model pore distribution of micropore and mesopore combined the advantages of mesoporous materials and the strong acidity and high thermal stability of microporous molecular sieves[1,2,3,4]. Preparation of micro-mesoporopus composite molecular sieve with microporous molecular sieve as the skeleton is one of the important methods to obtain composite materials. Zhao[12] adopted two-step hydrothermal crystallization method to synthesize micro-mesoporopus composite molecular sieve(Mȕ). Triantafyllidis et al.[13,14] ,Van Oers et al.[15] ,Di et al.[16,17] and Zheng[18, 19] have studied introducing primary or secondary structure of microporous molecular sieve such as ZSM-5,ȕ into pore walls of mesoporous molecular sieve to synthesize micro-mesoporopus composite materials successfully. The pore and crystal structure of Ȗ-Al2O3 can be kept stable under the crystallization conditions of ZSM-5 molecular sieve. We prepared a series of micro-mesoporopus ZSM-5/Al2O3 composite materials under different pretreatment method. To choose optimal pretreatment method by analysis the result of XRD, nitrogen adsorption - off desorption isotherms, BET specific surface area, SEM
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