Transient measurements of adsorption and diffusion in H‐ZSM‐5 membranes

Gardner, Tracy Q.; Flores, A.; Noble, Richard D.; Falconer, John L.

doi:10.1002/aic.690480604

Cited by 57 publications

(61 citation statements)

References 54 publications

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“…Transport through the support was modeled allowing for contributions of Knudsen and molecular diffusion and viscous flow, as described previously [4,7,[13][14][15]. Which mechanism dominates depends on the support properties and operating conditions.…”

Section: Theorycontrasting

confidence: 39%

Enhanced flux through double-sided zeolite membranes

Gardner

Martinek

Falconer

et al. 2007

Journal of Membrane Science

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Section: Theorycontrasting

confidence: 39%

Enhanced flux through double-sided zeolite membranes

Gardner

Martinek

Falconer

et al. 2007

Journal of Membrane Science

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“…In general, the capacity of CO 2 adsorption on the zeolites enhances when the partial CO 2 pressure increases and decreases with a rise of temperature (table 3). The results obtained by Yucel and Ruthven [68] and Gardner et al [69] have also shown that the diffusion of CO 2 in the zeolite 4A and H-ZSM-5 enhances with the increase of the partial pressure. Moreover, the data obtained by Akten et al [52] have indicated that the Na-4A selectivity for the CO 2 in the presence of N 2 and H 2 decreases slightly when the pressure in the gas phase enhances.…”

Section: Influence Of the Pressure And Temperature On The C O 2 Adsormentioning

confidence: 49%

Advances in principal factors influencing carbon dioxide adsorption on zeolites

Bonenfant

Kharoune

Niquette

et al. 2008

Science and Technology of Advanced Materials

274

179

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We report the advances in the principal structural and experimental factors that might influence the carbon dioxide (CO 2 ) adsorption on natural and synthetic zeolites. The CO 2 adsorption is principally govern by the inclusion of exchangeable cations (countercations) within the cavities of zeolites, which induce basicity and an electric field, two key parameters for CO 2 adsorption. More specifically, these two parameters vary with diverse factors including the nature, distribution and number of exchangeable cations. The structure of framework also determines CO 2 adsorption on zeolites by influencing the basicity and electric field in their cavities. In fact, the basicity and electric field usually vary inversely with the Si/Al ratio. Furthermore, the CO 2 adsorption might be limited by the size of pores within zeolites and by the carbonates formation during the CO 2 chemisorption. The polarity of molecules adsorbed on zeolites represents a very important factor that influences their interaction with the electric field. The adsorbates that have the most great quadrupole moment such as the CO 2 , might interact strongly with the electric field of zeolites and this favors their adsorption. The pressure, temperature and presence of water seem to be the most important experimental conditions that influence the adsorption of CO 2 . The CO 2 adsorption increases with the gas phase pressure and decreases with the rise of temperature. The presence of water significantly decreases adsorption capacity of cationic zeolites by decreasing strength and heterogeneity of the electric field and by favoring the formation of bicarbonates. The optimization of the zeolites structural characteristics and the experimental conditions might enhance substantially their CO 2 adsorption capacity and thereby might give rise to the excellent adsorbents that may be used to capturing the industrial emissions of CO 2 .

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“…The individual contributions to the total permeation depend mainly on the adsorption properties of the system, as well as on the conditions of temperature and pressure [30,31,32]. Moreover, in real membrane systems, Knudsen diffusion and/or viscous flow may be expected to contribute to the total permeation flux as well, owing to the presence of defects in the crystalline structure.…”

Section: Gas Permeation Through Microporous Membranescontrasting

confidence: 38%