Citation: YUE Ming-Bo, YANG Na, WANG Yi-Meng. Synthesis of Shaped ZSM-5 Zeolites by Dry-Gel Conversion with Seed Gel as Directing Agent[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201206141 shu

Synthesis of Shaped ZSM-5 Zeolites by Dry-Gel Conversion with Seed Gel as Directing Agent

YUE Ming-Bo ^1,2 ,
YANG Na ² ,
WANG Yi-Meng ^2,

1.
1. Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong Province, P. R. China;
2. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062, P. R. China

Received Date: 30 March 2012
Available Online: 14 June 2012
Fund Project: 国家自然科学基金(20890124, 21003083) (20890124, 21003083)山东省博士科研奖励基金(BS2009CL031)资助项目 (BS2009CL031)

Shaped binderless ZSM-5 zeolites were prepared via a rapid dry-gel conversion technique from aluminosilicate extrudate. Silica gel and boehmite were well mixed and extruded into cylindrical shaped extrudates with diameter of 2 mm with the aid of silica sol, ZSM-5 zeolite seed gel, and/or tetrapropylammonium hydroxide (TPAOH) solution. The total molar ratio of TPAOH to SiO₂ was fixed at 0.025. With same amounts of structure directing agent (TPAOH), the addition of seed gels accelerated the crystallization of the zeolite. The seed gel directing agent composition was 0.35TPAOH:1SiO₂:20H₂O: 4C₂H₅OH. The seed gel not only provided crystal nuclei for rapid crystallization but also controlled the size of the ZSM-5 crystals. Especially, the morphology of these extrudates was well maintained in the crystallization process. The crystallization processes of zeolite were characterized by X-ray diffraction (XRD), thermogravimetric (TG) analysis, and Fourier transform infrared (FTIR) spectroscopy. The results showed that the growth of the zeolite was accompanied by the occupation of the zeolite channels by TPAOH. When the TPAOH/SiO₂ molar ratio was 0.025, the sample achieved 100% relative crystallinity after 3 h crystallization. The morphology and textural properties were characterized by scanning electron microscopy (SEM) and nitrogen sorption isotherms. The obtained shaped zeolites comprised nanosized crystals (200 nm) and exhibited a hierarchical structure with high mesopore volume (0.28 cm³·g^-1). The temperature- programmed desorption of ammonia (NH₃-TPD) was used to assess the acidity of these shaped zeolites. The results showed that this shaped zeolite possessed an acidity similar to that of a commercial H-ZSM-5 catalyst.
- Shaped ZSM-5 zeolite,
- Dry-gel conversion,
- Hierarchical structure,
- Seed structure directing gel,
- Nanoscale zeolite
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