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Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity

Saunab Ghosh, Marta Sevilla, Antonio B. Fuertes, Enrico Andreoli Orcid Logo, Jason Ho, Andrew Barron Orcid Logo

J. Mater. Chem. A, Volume: 4, Issue: 38, Pages: 14739 - 14751

Swansea University Authors: Enrico Andreoli Orcid Logo, Andrew Barron Orcid Logo

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DOI (Published version): 10.1039/C6TA04936B

Abstract

The relative influence of heteroatom doping, surface area, and total pore volume of highly microporous carbon materials on CO2 uptake capacity, and the CO2/CH4 selectivity, at high pressure (≤30 bar) is presented. The separation of CO2 from natural gas (natural gas sweetening) is an important applic...

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Published in: J. Mater. Chem. A
ISSN: 2050-7496
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa29551
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spelling 2020-07-17T15:43:02.1643116 v2 29551 2016-08-12 Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity cbd843daab780bb55698a3daccd74df8 0000-0002-1207-2314 Enrico Andreoli Enrico Andreoli true false 92e452f20936d688d36f91c78574241d 0000-0002-2018-8288 Andrew Barron Andrew Barron true false 2016-08-12 CHEG The relative influence of heteroatom doping, surface area, and total pore volume of highly microporous carbon materials on CO2 uptake capacity, and the CO2/CH4 selectivity, at high pressure (≤30 bar) is presented. The separation of CO2 from natural gas (natural gas sweetening) is an important application that requires high CO2 uptake in combination with high CO2/CH4 selectivity. Porous carbon (PC), N-doped PC (NPC), and S-doped PC (SPC) materials are prepared using KOH oxidative activation at different temperatures. The surface chemical composition was determined by XPS, while the surface areas, total pore volume, and pore size distributions were obtained by analyzing N2 adsorption-desorption isotherms with support from SEM and TEM. The CO2 and CH4 uptake was determined by volumetric uptake measurements (sorption and desorption). Contrary to previous proposals that N- or S-doping results in high uptake and good selectivity, we show it is the Σ(O,N,S) wt% that is the defining factor for CO2 uptake, of which O appears to be the main factor. Based upon the data analyzed, a performance map has been defined as a guide to designing/choosing materials for both future studies and large scale fluid bed applications using pelletized materials. For CO2 uptake at 30 bar any material with a surface area &#62;2800 m2g-1 and a total pore volume &#62;1.35 cm3g-1 is unlikely to be bettered. Such a material is best prepared by thermal activation between 700-800 °C and will have a carbon content of 80-95 wt% (as determined by XPS). While it has been assumed that the parameters that make a good CO2 adsorbent are the same as those that make a material with high CO2/CH4 selectivity, our results indicate instead that for the best selectivity at 30 bar a surface area &#62;2000 m2g-1 and a total pore volume &#62;1.0 cm3g-1 and a carbon content of &#60;90 wt% are necessary. Journal Article J. Mater. Chem. A 4 38 14739 14751 2050-7496 11 8 2016 2016-08-11 10.1039/C6TA04936B COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2020-07-17T15:43:02.1643116 2016-08-12T09:08:41.8037411 Saunab Ghosh 1 Marta Sevilla 2 Antonio B. Fuertes 3 Enrico Andreoli 0000-0002-1207-2314 4 Jason Ho 5 Andrew Barron 0000-0002-2018-8288 6 0029551-12082016090917.pdf ghosh2016v2.pdf 2016-08-12T09:09:17.1870000 Output 2871854 application/pdf Accepted Manuscript true 2017-08-11T00:00:00.0000000 true
title Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity
spellingShingle Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity
Enrico Andreoli
Andrew Barron
title_short Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity
title_full Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity
title_fullStr Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity
title_full_unstemmed Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity
title_sort Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity
author_id_str_mv cbd843daab780bb55698a3daccd74df8
92e452f20936d688d36f91c78574241d
author_id_fullname_str_mv cbd843daab780bb55698a3daccd74df8_***_Enrico Andreoli
92e452f20936d688d36f91c78574241d_***_Andrew Barron
author Enrico Andreoli
Andrew Barron
author2 Saunab Ghosh
Marta Sevilla
Antonio B. Fuertes
Enrico Andreoli
Jason Ho
Andrew Barron
format Journal article
container_title J. Mater. Chem. A
container_volume 4
container_issue 38
container_start_page 14739
publishDate 2016
institution Swansea University
issn 2050-7496
doi_str_mv 10.1039/C6TA04936B
document_store_str 1
active_str 0
description The relative influence of heteroatom doping, surface area, and total pore volume of highly microporous carbon materials on CO2 uptake capacity, and the CO2/CH4 selectivity, at high pressure (≤30 bar) is presented. The separation of CO2 from natural gas (natural gas sweetening) is an important application that requires high CO2 uptake in combination with high CO2/CH4 selectivity. Porous carbon (PC), N-doped PC (NPC), and S-doped PC (SPC) materials are prepared using KOH oxidative activation at different temperatures. The surface chemical composition was determined by XPS, while the surface areas, total pore volume, and pore size distributions were obtained by analyzing N2 adsorption-desorption isotherms with support from SEM and TEM. The CO2 and CH4 uptake was determined by volumetric uptake measurements (sorption and desorption). Contrary to previous proposals that N- or S-doping results in high uptake and good selectivity, we show it is the Σ(O,N,S) wt% that is the defining factor for CO2 uptake, of which O appears to be the main factor. Based upon the data analyzed, a performance map has been defined as a guide to designing/choosing materials for both future studies and large scale fluid bed applications using pelletized materials. For CO2 uptake at 30 bar any material with a surface area &#62;2800 m2g-1 and a total pore volume &#62;1.35 cm3g-1 is unlikely to be bettered. Such a material is best prepared by thermal activation between 700-800 °C and will have a carbon content of 80-95 wt% (as determined by XPS). While it has been assumed that the parameters that make a good CO2 adsorbent are the same as those that make a material with high CO2/CH4 selectivity, our results indicate instead that for the best selectivity at 30 bar a surface area &#62;2000 m2g-1 and a total pore volume &#62;1.0 cm3g-1 and a carbon content of &#60;90 wt% are necessary.
published_date 2016-08-11T03:35:57Z
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score 11.037056

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