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Advanced Functional Materials 04/2008; 18(8):1314 - 1320. · 10.18 Impact Factor
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Berichte der deutschen chemischen Gesellschaft 04/2008; 2008(15):2448 - 2453. · 2.94 Impact Factor
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ABSTRACT: Microporous stannosilicate (K2SnSi3O9·H2O) and titanosilicate (K2TiSi3O9·H2O) with an umbite structure have been prepared as continuous membranes in about 5 μm thick layers on porous α-alumina and TiO2 tubular supports by seeded hydrothermal synthesis. These membranes are able to separate H2 from N2, CO2, and propane with good selectivity. Some stability problems appeared probably related to the reversible dehydration of the membranes.
04/2006;
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ABSTRACT: A new microporous titanosilicate umbite membrane has been synthesized on commercial porous TiO2 tubular supports. This membrane is able to separate H2/N2 mixtures (with selectivities as high as 48) even in the presence of water.
Chemical Communications 07/2005; · 6.17 Impact Factor
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ABSTRACT: Microporous titanosilicate (K2TiSi3O9H2O) with an umbite structure has been reproducibly prepared as 5-μm-thick continuous membranes on asymmetric TiO2 tubular supports by seeded hydrothermal synthesis. These membranes were able to separate H2 from N2 with good selectivity even in the presence of moisture, unlike other microporous zeolitic hydrophilic membranes where capillary condensation strongly hinders gas permeation. The average H2/N2 separation selectivity calculated for five Ti-umbite membranes obtained in the same synthesis conditions (200 °C, 48 h) was 45.2 ± 3.8 (together with an average H2 permeance of 4.6 ± 1.1 × 10−9 mol/(m2 s Pa).
Journal of Membrane Science 323(1):207-212. · 3.85 Impact Factor
