Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling

In this paper, the author reports a thermodynamic framework for understanding the surface – energy and the surface – structural interaction factors of activated carbons with various non polar adsorbate molecules. For better understanding, the author employs adsorption uptakes data of activated carbo...

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Main Author: Chakraborty, Anutosh
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2017
Subjects:
Online Access:https://hdl.handle.net/10356/85798
http://hdl.handle.net/10220/43835
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-857982020-03-07T13:19:26Z Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling Chakraborty, Anutosh School of Mechanical and Aerospace Engineering Activated Carbons Adsorbate Sizes In this paper, the author reports a thermodynamic framework for understanding the surface – energy and the surface – structural interaction factors of activated carbons with various non polar adsorbate molecules. For better understanding, the author employs adsorption uptakes data of activated carbons and some non-polar gases such as H2, Ar, N2, CO2, O2 and CH4 to calculate the enthalpy and entropy of adsorption in pressure-temperature-uptake coordinate systems. The RMS errors are calculated with respect to the proposed model and the experimental data. The minimum RMSEs are found as the model fits well with the experimental data. From theoretical observations, the heterogeneity factors (m) are obtained 1 for microporous and 2 for mesoporous activated carbons, and the interactions of non-polar gases on activated carbons are found to be more sensitive to the adsorbent pore geometry and the adsorbate size. It is also established that the enthalpy and entropy of adsorbent – adsorbate system are closely related to the kinetic diameter of adsorbate molecules, and the pore size equivalent to adsorbate kinetic diameter is the key to store more adsorbate at low pressures. For example, the pore width of activated carbon is roughly maintained 3.8 Å for more methane storage and 3.3 Å for more CO2 captures. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) 2017-10-03T05:38:22Z 2019-12-06T16:10:25Z 2017-10-03T05:38:22Z 2019-12-06T16:10:25Z 2016 Journal Article Chakraborty, A. (2016). Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling. Applied Thermal Engineering, 105, 189-197. 1359-4311 https://hdl.handle.net/10356/85798 http://hdl.handle.net/10220/43835 10.1016/j.applthermaleng.2016.05.160 en Applied Thermal Engineering © 2016 Elsevier Ltd.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Activated Carbons
Adsorbate Sizes
spellingShingle Activated Carbons
Adsorbate Sizes
Chakraborty, Anutosh
Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling
description In this paper, the author reports a thermodynamic framework for understanding the surface – energy and the surface – structural interaction factors of activated carbons with various non polar adsorbate molecules. For better understanding, the author employs adsorption uptakes data of activated carbons and some non-polar gases such as H2, Ar, N2, CO2, O2 and CH4 to calculate the enthalpy and entropy of adsorption in pressure-temperature-uptake coordinate systems. The RMS errors are calculated with respect to the proposed model and the experimental data. The minimum RMSEs are found as the model fits well with the experimental data. From theoretical observations, the heterogeneity factors (m) are obtained 1 for microporous and 2 for mesoporous activated carbons, and the interactions of non-polar gases on activated carbons are found to be more sensitive to the adsorbent pore geometry and the adsorbate size. It is also established that the enthalpy and entropy of adsorbent – adsorbate system are closely related to the kinetic diameter of adsorbate molecules, and the pore size equivalent to adsorbate kinetic diameter is the key to store more adsorbate at low pressures. For example, the pore width of activated carbon is roughly maintained 3.8 Å for more methane storage and 3.3 Å for more CO2 captures.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Chakraborty, Anutosh
format Article
author Chakraborty, Anutosh
author_sort Chakraborty, Anutosh
title Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling
title_short Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling
title_full Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling
title_fullStr Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling
title_full_unstemmed Thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling
title_sort thermodynamic trends for the adsorption of non polar gases on activated carbons employing a new adsorption isotherm modelling
publishDate 2017
url https://hdl.handle.net/10356/85798
http://hdl.handle.net/10220/43835
_version_ 1681040388559732736