Subject Area物理化学
A new template-free route to mesoporous ZSM-5 microspheres
Han W(韩伟); Jia YX(贾玉心); Xiong GX(熊国兴); Yang WS(杨维慎); Guoxing Xiong; Weishen Yang
Conference NameA Pre-conference of the 14th International Congress on Catalysis
Conference Date2008-7-9
Conference Place中国
Funding Organization大连化学物理研究所
AbstractZeolites have been applied widely on catalytic processes because their intricate micropores provide different types of shape selectivity1. However, their small pore size brings diffusion and mass transfer limitations, which can be solved by using zeolite nanocrystals or mesoporous zeolites. Since the use of zeolite nanocrystals will cause much higher pressure drops in packed-bed reactors and difficult recycles of catalysts, interests are focused on preparation of mesoporous zeolites. Generally, uniform mesopores in zeolite crystals are generated by adding soft2,3 or rigid4 templates into zeolite synthesis systems. Here, mesoporous ZSM-5 was prepared via a new template-free method. This method involves in-situ hydrothermal crystallization of the alumina-silica xerogel converted from uniform-sized sol particles by vacuum drying process. The obtained mesoporous ZSM-5 has micro-spherical morphology (Figure 1) and contains highly crystallized zeolite structures and bimodal mesopores (2.5±0.2nm, 11.7±3.1nm, Figure 2). Toluene-TPD and mesitylene-TPD results show that mesoporous ZSM-5 has obvious advantages over conventional micrometer-sized ZSM-5 in diffusion and mass transfer of organic molecules. The diffusion coefficient of toluene (or mesitylene) within the former is 2 (or 7) orders of magnitude higher than that within the latter.
Document Type会议论文
Corresponding AuthorGuoxing Xiong; Weishen Yang
Recommended Citation
GB/T 7714
Han W,Jia YX,Xiong GX,et al. A new template-free route to mesoporous ZSM-5 microspheres[C],2008:120/1.
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