Synthesis, characterization, and separation properties of Sn- and Ti-silicate umbite membranes

abstract

Microporous stannosilicate (K2SnSi3O9 center dot H2O) and titanosilicate (K2TiSi3O9 center dot H2O) with an umbite structure have been prepared as continuous membranes in about 5 mu m thick layers on porous alpha-alumina and TiO2 tubular supports by seeded hydrothermal synthesis. These membranes are able to separate H-2 from N-2, CO2, and propane with good selectivity. Some stability problems appeared probably related to the reversible dehydration of the membranes.

keywords

STRUCTURAL-CHARACTERIZATION; PERMEATION PROPERTIES; ZEOLITE MEMBRANES; POROUS MATERIALS; TITANOSILICATES; STATE

subject category

Chemistry; Materials Science

authors

Sebastian, V; Lin, Z; Rocha, J; Tellez, C; Santamaria, J; Coronas, J

our authors

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