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      High Potential of Interzeolite Conversion Method for Zeolite Synthesis

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      Journal of the Japan Petroleum Institute

      Japan Petroleum Institute

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          Amphiphilic organosilane-directed synthesis of crystalline zeolite with tunable mesoporosity.

          Zeolites are a family of crystalline aluminosilicate materials widely used as shape-selective catalysts, ion exchange materials, and adsorbents for organic compounds. 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 frameworks. 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 materials. 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.
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            Mesoporous Zeolite Single Crystals

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              A Working Hypothesis for Broadening Framework Types of Zeolites in Seed-Assisted Synthesis without Organic Structure-Directing Agent

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                Author and article information

                Journal
                JJPIAP
                Journal of the Japan Petroleum Institute
                J. Jpn. Petrol. Inst.
                Japan Petroleum Institute
                1346-8804
                1349-273X
                2013
                2013
                : 56
                : 4
                : 183-197
                Article
                10.1627/jpi.56.183
                7cd50b22-9389-45a4-8e7c-fb9c523e14ce
                © 2013

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