Predominant Gas Transport in Microporous Hydrotalcite–Silica Membrane

Wiheeb, Ahmed Daham; Ahmad, Mohd Azmier; Murat, Muhamad Nazri; Kim, Jinsoo; Othman, Mohd Roslee

doi:10.1007/s11242-013-0261-8

Cited by 15 publications

(3 citation statements)

References 21 publications

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“…To solve this problem and fill the cracks, the prepared hydrotalcite-based film was repeatedly coated with hydrotalcite precursor sol through dipping, drying, and sintering as a post-treatment process. The repetitive coating method has already been used to make defect-free inorganic films and membranes in previous studies. ,− In particular, Wiheeb et al prepared gas-permeable membranes by repetitively coating hydrotalcite precursor sol on an alumina support . For comparison, an alumina support was coated once, twice, and thrice with the hydrotalcite precursor sol (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Secondary Crystal Growth on a Cracked Hydrotalcite-Based Film Synthesized by the Sol–Gel Method

Lee

2016

Inorg. Chem.

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The sol-gel synthesis method is an attractive technology for the fabrication of ceramic films due to its preparation simplicity and ease of varying the metal composition. However, this technique presents some limitations in relation to the film thickness. Notably, when the film thickness exceeds the critical limit, large tensile stresses occur, resulting in a cracked morphology. In this study, a secondary crystal growth method was introduced as a post-treatment process for Mg/Al hydrotalcite-based films synthesized by the sol-gel method, which typically present a cracked morphology. The cracked hydrotalcite-based film was hydrothermally treated for the secondary growth of hydrotalcite crystals. In the resulting film, hydrotalcite grew with a vertical orientation, and the gaps formed during the sol-gel synthesis were filled with hydrotalcite after the crystal growth. The secondary crystal growth method provides a new solution for cracked ceramic films synthesized by the sol-gel method.

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Section: Resultsmentioning

confidence: 99%

Secondary Crystal Growth on a Cracked Hydrotalcite-Based Film Synthesized by the Sol–Gel Method

Lee

2016

Inorg. Chem.

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“…Glassy inorganic MMMs however are not well investigated, yet. Embedding a sorption-enhancing agent into a silica membrane is studied by the group of Othman and Wiheeb with tetraethylorthosilicate as a precursor for silica, which is very sensitive to moisture for applications in flue gases with water content [26][27][28][29][30][31]. This work presents a possible way to combine the adsorptive effect of calcined HTlc with an amorphous silica matrix to enhance the separation performance at high temperatures.…”

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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“…When the iron metal element is incorporated into hydrotalcite, the stability of the material is sustained and adsorption is improved as a result of the acid base interaction between acidic CO 2 and the basic sites of the adsorbent material which promotes CO 2 separation [68][69][83][84][85][86][87]. Also, the adsorption capacity of CO 2 for hydrotalcite coated/doped on zeolites (alumino silicates) was almost four times higher than that of the uncoated/doped zeolites at 30, 100, 200 and 300°C [66].…”

Section: Screening Of Adsorbent Materials For Co 2 Capturementioning

confidence: 99%

Pressure Swing Adsorption Technologies for Carbon Dioxide Capture

Wiheeb

Helwani

Kim

et al. 2015

Separation & Purification Reviews

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The principles of pressure swing adsorption (PSA) for carbon dioxide capture are reviewed.Previous work on PSA, relevant modeling and experimental investigation for specifically carbon dioxide separation are also presented and significant findings highlighted. Simple rules for PSA process design based on analysis of the inherent properties of adsorbate-adsorbent systems encompassing equilibrium isotherm, adsorption kinetics, shape of breakthrough curves, screening and selection of adsorbent, bed porosity, adsorption time, purge to feed ratio, residence Downloaded by [University of Sussex Library] at 07:46 17 August 2015A c c e p t e d M a n u s c r i p t 2 time, pressure equalization and rinse steps are provided to promote better understanding of the technology so that it gains wider acceptance in the future to address the global environmental concern, particularly in the removal of carbon dioxide as a greenhouse gas.

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Predominant Gas Transport in Microporous Hydrotalcite–Silica Membrane

Cited by 15 publications

References 21 publications

Secondary Crystal Growth on a Cracked Hydrotalcite-Based Film Synthesized by the Sol–Gel Method

Secondary Crystal Growth on a Cracked Hydrotalcite-Based Film Synthesized by the Sol–Gel Method

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

Pressure Swing Adsorption Technologies for Carbon Dioxide Capture

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