Synthesis and Characterization of ZSM-5/Nano-β Core-Shell Composite-Zeolites

Abstract

Abstract:

ZSM-5/nano-β core-shell composite-zeolites were hydrothermally synthesized by a secondary growth on core ZSM-5 with a uniform size of 1 μm, which was pre-adsorbed with nano-β seeds after pretreated with positive PDDA(poly dimethyldiallylammonium chloride), and then was calcined in air. The obtained products were characterized by XRD, SEM/TEM, and N₂ sorption analysis, which demonstrated the formation of ordered core-shell structure. The results proved the formation of composite-zeolites with a ZSM-5 core(ca.82%) and a poly-nano-β shell(ca.18%). The coverage of shell was tested via S_external measurements of the products, and the core ZSM-5 showed a more compact shell with fumed silica rather than TEOS as the silica source. Moreover, tested by NH₃-TPD and probe reactions on 1,3,5-TMB cracking, it is found that the surface acidity changed after the growth of nano-β layer, and the formed ZSM-5/nano-β has a better catalytic performance(ca.80% conversion) and lower deactivation rate.

Key words: ZSM-5 zeolite, Nano-β zeolite, Core-shell, Cationic polyelectrolyte, Silica source

TrendMD:

TONG Wei-Yi, LIU Zhi-Cheng, KONG De-Jin*, QI Xiao-Lan, GUO Yang-Long*. Synthesis and Characterization of ZSM-5/Nano-β Core-Shell Composite-Zeolites[J]. Chem. J. Chinese Universities, 2009, 30(5): 959.

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