Granular carbon molecular sieves

Braymer, T.A.; Coe, Charles G.; Farris, Thomas S.; Gaffney, Thomas R.; Schork, Joan M.; Armor, John N.

doi:10.1016/0008-6223(94)90165-1

Cited by 48 publications

(32 citation statements)

References 7 publications

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“…Considering CMS as an assemblage of identical microcrystals, several kinetic models were used to fit the experimental uptake data in order to describe the kinetic behaviour of gases and vapours. Models like the linear driving force model (LDF), Fickian diffusion model and combined surface resistance/Fickian diffusion model were applied to determine the diffusivity of the sorbates inside the CMS pores. Comparisons between the model results provide means of getting an insight into the nature of the mass transfer rate controlling mechanism, as well as better understanding of interactions between sorbate molecules and active pore surfaces.…”

Section: Adsorption Modelsmentioning

confidence: 99%

Kinetic behaviours of carbon dioxide and carbon monoxide on carbon molecular sieve

Shirani

Eić

2016

Can J Chem Eng

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A carbon molecular sieve (CMS) is a carbonaceous material with a narrow pore size distribution, which can separate molecules based on their size, shape, and adsorption kinetic rate. In this study, a commercial CMS was used to measure the adsorption kinetics of carbon dioxide and carbon monoxide. The rate of adsorption was investigated by considering two main resistances, surface barrier and diffusion. The results showed that molecular parameters, such as difference in shape, size, and interactions of molecules, lead to different adsorption kinetics mechanisms. In the system investigated in this study, the adsorption kinetics of both CO2 and CO sorbates were controlled by combined diffusion and surface barrier mechanisms, in which the surface barrier was found to be the main resistance to gas molecule uptake. Even though this study confirmed surface resistance as a dominant transfer mechanism, the systematic use of the combined model in the analysis provided further insights in the mass transfer due to adsorption of CO2 and CO molecules in the CMS adsorbent. The rate constants were found to follow the Darken equation for both sorbates. The kinetic selectivity of CO2 over CO was calculated from the combined surface barrier/diffusion model parametric analysis. The results generally showed a greater selectivity to carbon dioxide over carbon monoxide, i.e. higher mass transfer rates.

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Section: Adsorption Modelsmentioning

confidence: 99%

Kinetic behaviours of carbon dioxide and carbon monoxide on carbon molecular sieve

Shirani

Eić

2016

Can J Chem Eng

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“…The importance of this gate-keeping layer is most vividly demonstrated in the work from Air Prod-Ž . ucts Cabrera et al, 1993;Braymer et al, 1995 andVerma Ž . andWalker 1992 .…”

Section: Introductionmentioning

confidence: 99%

Transport in nanoporous carbon membranes: Experiments and analysis

Acharya

Foley

2000

AIChE Journal

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“…Several methods have been developed for CMS production such as pyrolysis (Braymer et al 1994), activation and carbon vapour deposition (CVD) (Vyas et al 1994;Nguyen and Do 1995;Villar-Rodil et al 2005;Freitas and Figueiredo 2001;Kawabuchi et al 1996). Among them, the CVD approach has been found particularly suitable and has received considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Preparation of carbon molecular sieves from palm shell: effect of benzene deposition conditions

Ahmad

2009

Adsorption

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Application of carbon molecular sieve (CMS) for gas separation has been found much attention recently. In this work, CMS was prepared from locally available palm shell through carbonization, steam activation and carbon vapour deposition (CVD) technique. After carbonization step, the char produced was subjected to steam activation at various activation times. The activated carbon obtained at 53.2% burn-off, which contain the highest amount of micropore volume was further used in CVD step by using benzene vapour at various deposition conditions. The performance of CMSs produced was examined by assessing the adsorption kinetics of O 2 , N 2 , CO 2 and CH 4 gases. All CMS samples showed a small N 2 and CH 4 uptake compared to the O 2 and CO 2 . The suitable conditions for CVD were found at 800°C, 30 min and 30 vol% benzene of deposition temperature, time and benzene concentration, respectively. At this point the O 2 /N 2 and CO 2 /CH 4 uptake ratios arrived 7.1 and 16.0, respectively.

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Granular carbon molecular sieves

Cited by 48 publications

References 7 publications

Kinetic behaviours of carbon dioxide and carbon monoxide on carbon molecular sieve

Kinetic behaviours of carbon dioxide and carbon monoxide on carbon molecular sieve

Transport in nanoporous carbon membranes: Experiments and analysis

Preparation of carbon molecular sieves from palm shell: effect of benzene deposition conditions

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