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Effect of Electrolyte pH on CH(4) Adsorption and Desorption Behavior in Electrochemically Modified Lean Coal

[Image: see text] Practical application of the electrochemical method for enhancing coalbed methane (CBM) extraction is limited due to the insufficiency of in-depth experimental and theoretical research. Therefore, H(2)SO(4), Na(2)SO(4), and NaOH electrolytes with different pH values were selected t...

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Detalles Bibliográficos
Autores principales: Li, Ligong, Li, Yanbin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8340380/
https://www.ncbi.nlm.nih.gov/pubmed/34368561
http://dx.doi.org/10.1021/acsomega.1c02418
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author Li, Ligong
Li, Yanbin
author_facet Li, Ligong
Li, Yanbin
author_sort Li, Ligong
collection PubMed
description [Image: see text] Practical application of the electrochemical method for enhancing coalbed methane (CBM) extraction is limited due to the insufficiency of in-depth experimental and theoretical research. Therefore, H(2)SO(4), Na(2)SO(4), and NaOH electrolytes with different pH values were selected to electrochemically modify lean coals and their CH(4) adsorption and desorption behaviors were tested. The experimental results showed that the amount of CH(4) adsorption decreased after modification using H(2)SO(4) and Na(2)SO(4) electrolytes, and increased after electrochemical modification using the NaOH electrolyte. The ratio of CH(4) desorption increased from 83.20 to 90.10 and 87.84%, respectively, after electrochemical modification using H(2)SO(4) and Na(2)SO(4) electrolytes, and decreased to 81.71% after electrochemical modification using the NaOH electrolyte. The pore volume and average pore size increased, and the specific surface area decreased with the decrease of electrolyte pH. Lower pH electrolytes perform better and the mechanism was analyzed by the change of surface energy, surface groups, and pore structures. The work will provide a basis for the reasonable selection of electrolyte pH when using in situ electrochemical methods for enhancing CBM extraction.
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spelling pubmed-83403802021-08-06 Effect of Electrolyte pH on CH(4) Adsorption and Desorption Behavior in Electrochemically Modified Lean Coal Li, Ligong Li, Yanbin ACS Omega [Image: see text] Practical application of the electrochemical method for enhancing coalbed methane (CBM) extraction is limited due to the insufficiency of in-depth experimental and theoretical research. Therefore, H(2)SO(4), Na(2)SO(4), and NaOH electrolytes with different pH values were selected to electrochemically modify lean coals and their CH(4) adsorption and desorption behaviors were tested. The experimental results showed that the amount of CH(4) adsorption decreased after modification using H(2)SO(4) and Na(2)SO(4) electrolytes, and increased after electrochemical modification using the NaOH electrolyte. The ratio of CH(4) desorption increased from 83.20 to 90.10 and 87.84%, respectively, after electrochemical modification using H(2)SO(4) and Na(2)SO(4) electrolytes, and decreased to 81.71% after electrochemical modification using the NaOH electrolyte. The pore volume and average pore size increased, and the specific surface area decreased with the decrease of electrolyte pH. Lower pH electrolytes perform better and the mechanism was analyzed by the change of surface energy, surface groups, and pore structures. The work will provide a basis for the reasonable selection of electrolyte pH when using in situ electrochemical methods for enhancing CBM extraction. American Chemical Society 2021-07-19 /pmc/articles/PMC8340380/ /pubmed/34368561 http://dx.doi.org/10.1021/acsomega.1c02418 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Li, Ligong
Li, Yanbin
Effect of Electrolyte pH on CH(4) Adsorption and Desorption Behavior in Electrochemically Modified Lean Coal
title Effect of Electrolyte pH on CH(4) Adsorption and Desorption Behavior in Electrochemically Modified Lean Coal
title_full Effect of Electrolyte pH on CH(4) Adsorption and Desorption Behavior in Electrochemically Modified Lean Coal
title_fullStr Effect of Electrolyte pH on CH(4) Adsorption and Desorption Behavior in Electrochemically Modified Lean Coal
title_full_unstemmed Effect of Electrolyte pH on CH(4) Adsorption and Desorption Behavior in Electrochemically Modified Lean Coal
title_short Effect of Electrolyte pH on CH(4) Adsorption and Desorption Behavior in Electrochemically Modified Lean Coal
title_sort effect of electrolyte ph on ch(4) adsorption and desorption behavior in electrochemically modified lean coal
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8340380/
https://www.ncbi.nlm.nih.gov/pubmed/34368561
http://dx.doi.org/10.1021/acsomega.1c02418
work_keys_str_mv AT liligong effectofelectrolytephonch4adsorptionanddesorptionbehaviorinelectrochemicallymodifiedleancoal
AT liyanbin effectofelectrolytephonch4adsorptionanddesorptionbehaviorinelectrochemicallymodifiedleancoal