Letter abstract
Nature Materials 5, 718 - 723 (2006)
Published online: 6 August 2006 | doi:10.1038/nmat1705
Subject Categories: Catalytic materials | Porous materials
Amphiphilic organosilane-directed synthesis of crystalline zeolite with tunable mesoporosity
Minkee Choi, Hae Sung Cho, Rajendra Srivastava, Chithravel Venkatesan, Dae-Heung Choi & Ryong Ryoo
Zeolites are a family of crystalline aluminosilicate materials widely used as shape-selective catalysts, ion exchange materials, and adsorbents for organic compounds1, 2. In the present work, zeolites were synthesized by adding a rationally designed amphiphilic organosilane surfactant to conventional alkaline zeolite synthesis mixtures. The zeolite products were characterized by a complementary combination of X-ray diffraction (XRD), nitrogen sorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The analyses show that the present method is suitable as a direct synthesis route to highly mesoporous zeolites. The mesopore diameters could be uniformly tailored, similar to ordered mesoporous silica with amorphous frameworks3. The mesoporous zeolite exhibited a narrow, small-angle XRD peak, which is characteristic of the short-range correlation between mesopores, similar to disordered wormhole-like mesoporous materials4, 5. The XRD patterns and electron micrographs of the samples taken during crystallization clearly showed the evolution of the mesoporous structure concomitantly to the crystallization of zeolite frameworks. The synthesis of the crystalline aluminosilicate materials with tunable mesoporosity and strong acidity has potentially important technological implications for catalytic reactions of large molecules, whereas conventional mesoporous materials lack hydrothermal stability and acidity.
- National Creative Research Initiative Center for Functional Nanomaterials and Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
Correspondence to: Ryong Ryoo e-mail: rryoo@kaist.ac.kr
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