Hybrid Materials for Molecular Sieves

Elshof, Johan E. ten

doi:10.1007/978-3-319-19454-7_94-1

Cited by 2 publications

(1 citation statement)

References 67 publications

(90 reference statements)

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“…Several membrane materials based on various zeolites [10], metal-organic frameworks (MOFs) [11], carbon-based membranes [12], and sol-gel derived silica gels [13,14] have been extensively studied for selectivity of CO2 in microporous media. Silica membranes demonstrate good selectivity for CO2 and reasonable permeance.…”

Section: Preprintsmentioning

confidence: 99%

Mixed Matrix Organo-Silica-Hydrotalcite Membrane for CO2 Separation Part 2: Permeation and Selectivity Study

Bünger,

Kurtz,

Garbev

et al. 2024

Preprint

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This study introduces an innovative approach to designing membranes capable of separating CO2 from industrial gas streams at higher temperatures. The novel membrane design seeks to leverage the well-researched high-temperature CO2 adsorbent, hydrotalcite, by transforming it into a membrane. This is achieved by combining it with an amorphous organo-silica-based matrix, extending the polymer-based Mixed Matrix Membrane concept to inorganic compounds. Following the membrane material preparation and investigation of the individual membrane in Part 1 of this study, we examine its permeation and selectivity here. The pure 200 nm thick hydrotalcite membrane exhibits Knudsen behavior due to large intercrystalline pores. In contrast, the organo-silica membrane demonstrates a permselectivity of 13.5 and permeance for CO2 of 1.3 107 mol m2 s1 Pa1 at 25°C, at 150°C the good separation behavior is reduced. Combining both components results in a hybrid microstructure, featuring selective surface diffusion in the microporous regions and unselective Knudsen diffusion in the mesoporous regions. Further attempts to bridge both components to form a purely microporous microstructure are outlined.

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