Heat capacity and thermodynamic functions of partially dehydrated sodium and zinc zeolite A (LTA)

Dickson, Matthew S.; Rosen, Peter F.; Neilsen, Grace; Calvin, Jason J.; Navrotsky, Alexandra; Woodfield, Brian F.

doi:10.2138/am-2021-7726

Cited by 2 publications

(3 citation statements)

References 38 publications

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“…However, over a wide temperature range, it is hard to define the phase of the water and the heat capacity of the water. Recently, Dickson et al reported the heat capacity of water molecules bound to LTA zeolite as 1.09 J/g/K at 320 K by using the difference in heat capacities between dehumidified and wet zeolites . For our estimation of the zeolites studied here, we used the reported heat capacity of adsorbed water molecules on LTA zeolites.…”

Section: Methodsmentioning

confidence: 99%

“… b CO 2 heat capacity is the averaged value over −20 and 200 °C c Heat capacity of H 2 O was estimated based on the H 2 O molecule adsorbed in LTA zeolite …”

Section: Methodsmentioning

confidence: 99%

“…Recently, Dickson et al reported the heat capacity of water molecules bound to LTA zeolite as 1.09 J/g/K at 320 K by using the difference in heat capacities between dehumidified and wet zeolites. 38 For our estimation of the zeolites studied here, we used the reported heat capacity of adsorbed water molecules on LTA zeolites. The heat of adsorption values for CO 2 and H 2 O adsorbed onto 5A were acquired from the literature.…”

Section: Methodsmentioning

confidence: 99%

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Cold-Temperature Capture of Carbon Dioxide with Water Coproduction from Air Using Commercial Zeolites

Song

Rim

Kong

et al. 2022

Ind. Eng. Chem. Res.

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The CO 2 sorption behavior of commercially available zeolites such as 3A, 4A, 5A, and 13X is considered at low temperatures for CO 2 removal from ambient air or direct air capture (DAC). Low silica zeolites are typically not effective CO 2 sorbents in the presence of water, as they preferentially competitively adsorb water from humid gas streams, resulting in high sorbent regeneration costs. We hypothesize that low silica zeolites may function as efficient physisorbents for DAC if deployed at cold temperatures where the absolute humidity of air is low. Two modes of deployment of low silica zeolites for DAC at cold temperatures are explored here. Based on the CO 2 isotherms of the zeolites at −20 °C with different H 2 O surface loadings, zeolite 5A was selected for evaluation in a competitive H 2 O and CO 2 coadsorption process as the first mode of deployment. Despite the low absolute humidity at −20 °C compared to that at 25 °C, H 2 O adsorption and accumulation result in a 39% decrease in the CO 2 adsorption capacity of 5A, rendering the process energetically expensive. In the second mode of deployment, focusing on estimates of the thermal energy requirements, zeolite 13X with silica gel as a desiccant in a two-stage, two-bed process is found to provide a potentially energetically feasible process (4359 MJ/tCO 2 ) for cold-temperature DAC. Cyclic adsorption and desorption cycles swinging between −20 and 200 °C with 0.04% and 99.9% CO 2 , respectively, are conducted to experimentally support the thermal energy calculations using a temperature swing adsorption (TSA) process. Water production using available cooling energy from cold ambient air offers the potential to reduce the cost of DAC, as do additional process design modes such as vacuum swing adsorption and advanced heat management systems.

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Section: Methodsmentioning

confidence: 99%

“… b CO 2 heat capacity is the averaged value over −20 and 200 °C c Heat capacity of H 2 O was estimated based on the H 2 O molecule adsorbed in LTA zeolite …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Cold-Temperature Capture of Carbon Dioxide with Water Coproduction from Air Using Commercial Zeolites

Song

Rim

Kong

et al. 2022

Ind. Eng. Chem. Res.

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Structural and thermodynamic effects of hydration in Na-zeolite A (LTA) from low-temperature heat capacity

Dickson

Shumway

Neilsen

et al. 2023

The Journal of Chemical Thermodynamics

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Heat capacity and thermodynamic functions of partially dehydrated sodium and zinc zeolite A (LTA)

Abstract: This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

Cited by 2 publications

References 38 publications

Cold-Temperature Capture of Carbon Dioxide with Water Coproduction from Air Using Commercial Zeolites

Cold-Temperature Capture of Carbon Dioxide with Water Coproduction from Air Using Commercial Zeolites

Structural and thermodynamic effects of hydration in Na-zeolite A (LTA) from low-temperature heat capacity

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