Isotherms for Water Adsorption on Molecular Sieve 3A: Influence of Cation Composition

Lin, Ronghong; Ladshaw, Austin; Nan, Yue; Liu, Jiuxu; Yiacoumi, Sotira; Tsouris, Costas; DePaoli, David W.; Tavlarides, Lawrence L.

doi:10.1021/acs.iecr.5b01411

Cited by 50 publications

(60 citation statements)

References 17 publications

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“…Photographs of the iodine adsorption systems, and details of the adsorption column and the screen tray with Ag 0 Z loaded are shown in Figure . More details of the microbalance and adsorption column were described previously …”

Section: Methodsmentioning

confidence: 99%

Adsorption of iodine on hydrogen‐reduced silver‐exchanged mordenite: Experiments and modeling

2016

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The adsorption process of iodine, a major volatile radionuclide in the off‐gas streams of spent nuclear fuel reprocessing, on hydrogen‐reduced silver‐exchanged mordenite (Ag0Z) was studied at the micro‐scale. The gas‐solid mass transfer and reaction involved in the adsorption process were investigated and evaluated with appropriate models. Optimal conditions for reducing the silver‐exchanged mordenite (AgZ) in a hydrogen stream were determined. Kinetic and equilibrium data of iodine adsorption on Ag0Z were obtained by performing single‐layer adsorption experiments with experimental systems of high precision at 373–473 K over various iodine concentrations. Results indicate approximately 91% to 97% of the iodine adsorption was through the silver‐iodine reaction. The effect of temperature on the iodine loading capacity of Ag0Z was discussed. The Shrinking Core model describes the data well, and the primary rate controlling mechanisms were macro‐pore diffusion and silver‐iodine reaction. © 2016 American Institute of Chemical Engineers AIChE J, 63: 1024–1035, 2017

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Section: Methodsmentioning

confidence: 99%

Adsorption of iodine on hydrogen‐reduced silver‐exchanged mordenite: Experiments and modeling

2016

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“…The adsorption of water vapor on commercial MS3A zeolite adsorbents has a potential use for the capture of tritiated water (HHO) from the off‐gas stream of nuclear fuel reprocessing facilities . A prior study of the kinetics of water vapor on MS3A had utilized various simple kinetic models, such as linear driving force and shrinking core models .…”

Section: Modeling Resultsmentioning

confidence: 99%

“…For the work considered here, the Generalized Statistical Thermodynamic Adsorption (GSTA) isotherm model was chosen as the equilibrium model. This isotherm is very flexible and has been shown to be useful at describing the adsorption equilibrium of many different systems . Additionally, this model has also been used in mixed‐gas adsorption equilibrium models with great success .…”

Section: Models For Specific Systemsmentioning

confidence: 99%

A mechanistic modeling framework for gas‐phase adsorption kinetics and fixed‐bed transport

et al. 2017

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Adsorption is a complex physicochemical process involving interparticle transport, interphase mass‐transfer, intraparticle diffusion, and surface reactions. Although the exact description of the adsorption process will inevitably vary from system to system, it will always be governed by those primary mechanisms. Therefore, by devising a model framework that can inherently include those mechanisms, it would be possible to create a modeling platform on which many different adsorption problems could be solved numerically. To accomplish this task, a generalized 1‐D conservation law model was created to include the necessary mechanisms of adsorption on several different geometrical domains. Specific model applications for adsorption were developed under that framework and validated using experimental data available in literature or obtained in this work. This modeling platform makes it easier to model various adsorption problems and develop new adsorption models because of the common treatment of the mathematics governing the physical processes. © 2017 American Institute of Chemical Engineers AIChE J, 2017

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“…In literature, between 2 and 7 (Gabruś et al 2015;Llano-Restrepo and Mosquera 2009;Ladshaw et al 2015;Wang 2020;Loughlin 2009;Lin et al 2015) different energetic sites have been proposed for water adsorption on LTA zeolites. Clearly, the LTA framework consists of two distinct cavities which are accessible to water, the α and β cages (Breck et al 1956;Reed and Breck 1956).…”

Section: Adsorption Isotherm Modelmentioning

confidence: 99%

Steam adsorption on molecular sieve 3A for sorption enhanced reaction processes

Kampen

Boon

Annaland³

2020

Adsorption

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Steam adsorption enhanced reaction processes are a promising process intensification for many types of reactions, where water is formed as a byproduct. To assess the potential of these processes, adequate models are required that accurately describe water adsorption, particularly under the desired elevated temperatures and pressures. In this work, an adsorption isotherm is presented for H2O adsorption at 200–350 °C and 0.05–4.5 bar partial pressure on molecular sieve (LTA) 3A. The isotherm has been developed on the basis of experimental data obtained from a thermogravimetric analysis and integrated breakthrough curves. The experimental data at lower steam partial pressures can be described with a Generalized Statistical Thermodynamic Adsorption (GSTA) isotherm, whereas at higher steam partial pressures the experimental data can be adequately captured by capillary condensation. Based on the characteristics of the adsorbent particles, a linear driving force relation has been derived for the adsorption mass transfer rate and the apparent micropore diffusivity is determined. The isotherm and mass transport model presented here prove to be adequate for modelling and improved evaluation of steam adsorption enhanced reaction processes.

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Isotherms for Water Adsorption on Molecular Sieve 3A: Influence of Cation Composition

Cited by 50 publications

References 17 publications

Adsorption of iodine on hydrogen‐reduced silver‐exchanged mordenite: Experiments and modeling

Adsorption of iodine on hydrogen‐reduced silver‐exchanged mordenite: Experiments and modeling

A mechanistic modeling framework for gas‐phase adsorption kinetics and fixed‐bed transport

Steam adsorption on molecular sieve 3A for sorption enhanced reaction processes

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