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      Post-Synthesis Stabilization of Germanosilicate Zeolites ITH, IWW, and UTL by Substitution of Ge for Al

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          Extra-large-pore zeolites with two-dimensional channels formed by 14 and 12 rings.

          Stable zeolites that have larger pore apertures and a three-dimensional pore topology are of interest because they could be used to adsorb larger molecules, particularly for application in oil refining. Several large-pore zeolitic materials with channels formed by openings of more than 12 rings are known, but all of them have a one-dimensional channel system that limits their use in catalysis. We report the synthesis and some characterizations of IM-12, a thermally stable germanium-containing zeolite that contains the first two-dimensional channel system with extra-large pores formed by 14- and 12-ring channels.
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            Exploiting chemically selective weakness in solids as a route to new porous materials.

            Weakness in a material, especially when challenged by chemical, mechanical or physical stimuli, is often viewed as something extremely negative. There are countless examples in which interesting-looking materials have been dismissed as being too unstable for an application. But instability with respect to a stimulus is not always a negative point. In this Perspective we highlight situations where weakness in a material can be used as a synthetic tool to prepare materials that, at present, are difficult or even impossible to prepare using traditional synthetic approaches. To emphasize the concept, we will draw upon examples in the field of nanoporous materials, concentrating on metal-organic frameworks and zeolites, but the general concepts are likely to be applicable across a wide range of materials chemistry. In zeolite chemistry, there is a particular problem with accessing hypothetical structures that this approach may solve.
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              ITQ-15: the first ultralarge pore zeolite with a bi-directional pore system formed by intersecting 14- and 12-ring channels, and its catalytic implications.

              The pore topology of ITQ-15 zeolite consists of an ultra-large 14-ring channel that is intersected perpendicularly by a 12-ring pore; acid sites have been introduced in its framework and this unique structure shows advantages over unidirectional ultralarge pore zeolites for diffusing and reacting large molecules.
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                Author and article information

                Journal
                Chemistry - A European Journal
                Chem. Eur. J.
                Wiley
                09476539
                November 21 2016
                November 21 2016
                October 18 2016
                : 22
                : 48
                : 17377-17386
                Affiliations
                [1 ]Department Synthesis and Catalysis; J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, v. v. i.; Dolejškova 3 182 23 Prague 8 Czech Republic
                [2 ]Department of Physical and Macromolecular Chemistry; Faculty of Science; Charles University in Prague; Hlavova 2030 12840 Prague 2 Czech Republic
                [3 ]EaStCHEM School of Chemistry; University of St. Andrews; St. Andrews KY16 9ST UK
                Article
                10.1002/chem.201603434
                © 2016

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