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Recent Progresses in the Understanding of Chemical Properties of Zeolitest correspond to acidic, metallic, basic or redox-type reactions since it involves active sites whose nature, chemical strength, density and distribution in strength have to be determined. The physical aspect is known to greatly influence shape selectivity (1), confinement (2) and diffusion (1) prope

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The Determination of (Si,Al) Distribution in Zeolitesfluence on the calculated Al-fraction. The differences in the (Si,Al) distribution found by comparing the results of a method proposed by Alberti and Gottardi., which takes into account effects no. 1 and no. 2, and of Jones’. determinative curve are stressed.

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Zeolitic Heteropoly Oxometalatesns and water molecules, both of which have considerable freedom of movement, permitting ion exchange and reversible dehydration” to encompass microporous aluminophosphates in 1980 and “nous ne savons quoi” by the year 2000. As Galen Stucky has prophesized in his Preface to Intrazeolite Chemistry. it

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Confinement Effects in Sorption and Catalysis by Zeolitesh they offer to the molecules they host. Surface curvature leads to confinement effects when the size of the host structure (the pores of the framework) and that of the guest molecule (reactant, reaction intermediate, product) become comparable. Following a quantitative description of confinement an

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Acid Function in Zeolites: Recent Progressal tentative conclusions are also drawn, in order to interpret some of the important chemical phenomena. In view of the availability of several detailed reviews on catalytic data, these will not be reviewed here.

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Directing Activity and Selectivity of Large Pore Acid Zeolites Through the Control of their Physicocsible not only for the so-called shape selectivity, but also will determine the number, accesibility and strength of the active sites due to changes in the T-O-T angles. If one refers to acid zeolites, the deprotonation energy of a bridged hydroxyl group depends on its local geometry, which is deter

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Soziologische Gegenwartsdiagnosen Itive catalyst for both ethylbenzene disproportionation and n-decane cracking after a brief contact with traces of water vapor. For the solid-state reaction itself, the presence of water is not a prerequisite.