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椰壳活性炭吸附法分离CH/CO的评估：气体湿度对平衡选择性和吸附容量的影响。

Evaluation of the CH/CO separation by adsorption on coconut shell activated carbon: Impact of the gas moisture on equilibrium selectivity and adsorption capacity.

作者信息

Staudt Junior, Musial Cassiano Moreira, Canevesi Rafael, Fierro Vanessa, Ribeiro Caroline, Alves Helton José, Borba Carlos Eduardo

机构信息

Postgraduate Program in Chemical Engineering, West Parana State University, Campus Toledo, Faculdade St. 645, Jd. La Salle, 85903-000, Toledo, PR, Brazil.

Institut Jean Lamour, CNRS, Université de Lorraine, no 7198, ENSTIB, 27 rue Philippe Séguin, BP 21042, 88051 Epinal Cedex 9, France.

出版信息

Heliyon. 2024 Apr 30;10(9):e30368. doi: 10.1016/j.heliyon.2024.e30368. eCollection 2024 May 15.

DOI:10.1016/j.heliyon.2024.e30368
PMID:38726144
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11079097/
Abstract

Upgrading biogas to biomethane is of great interest to change the energy matrix by feeding the renewable fuel produced from biomass waste into natural gas grids or directly using it to replace fossil fuels. The study aimed to assess the adsorption equilibrium of CH, CO and HO on a coconut-shell activated carbon (CAC 8X30) to provide data for further studies on its efficiency in upgrading biogas by Pressure Swing Adsorption (PSA). The adsorbent was characterized, and equilibrium parameters were estimated from monocomponent CH, CO and HO equilibrium isotherms. Binary and ternary equilibrium isotherms were simulated, and the selectivity and adsorption capacity of the CAC 8X30 were calculated in dry and wet conditions and then compared with zeolite 13X as a reference material. Regarding characterization, Nitrogen and Hydrogen Physisorption results indicated that 94 % of the pore volume is concentrated in the region of micropores. The adsorption affinity with CAC 8X30 estimated from monocomponent isotherms was in the order >>. IAST-Langmuir model simulations presented good agreement with experimental binary equilibrium data. Further simulations indicated equilibrium selectivity for CO over CH (e.g., 4.7 at 1 bar and 298 K for a mixture of CH/CO, 60/40 vol%), which increased in the presence of moisture, indicating its suitability for upgrading humid biogas. Simulations for zeolite 13X suggested that the material is unsuitable in the presence of water vapor but presents higher selectivity than the CAC 8X30 in dry conditions. Hence, the integration of both materials might be helpful for biogas upgrading.

摘要

将沼气升级为生物甲烷对于通过将生物质废物产生的可再生燃料输入天然气网络或直接用其替代化石燃料来改变能源矩阵具有重大意义。该研究旨在评估CH、CO和H₂O在椰壳活性炭（CAC 8X30）上的吸附平衡，为进一步研究其在变压吸附（PSA）升级沼气方面的效率提供数据。对吸附剂进行了表征，并从单组分CH、CO和H₂O平衡等温线估计了平衡参数。模拟了二元和三元平衡等温线，并计算了CAC 8X30在干燥和潮湿条件下的选择性和吸附容量，然后与作为参考材料的13X沸石进行比较。关于表征，氮气和氢气物理吸附结果表明94%的孔体积集中在微孔区域。从单组分等温线估计的与CAC 8X30的吸附亲和力顺序为>>。IAST - 朗缪尔模型模拟与实验二元平衡数据吻合良好。进一步的模拟表明对CO相对于CH的平衡选择性（例如，对于CH₄/CO体积比为60/40的混合物，在1 bar和298 K下为4.7），在有水汽存在时增加，表明其适用于升级潮湿沼气。对13X沸石的模拟表明该材料在有水蒸气存在时不适用，但在干燥条件下比CAC 8X30具有更高的选择性。因此，两种材料的结合可能有助于沼气升级。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/917fcd18cc3a/gr12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/0daa5a08b55d/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/078a10c26e28/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/80adc87a751e/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/c3eab58978a2/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/b15014e987ef/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/57d0e794963b/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/fcd693899c07/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/6cad148b10b3/gr8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/c3e99b99fd9f/gr9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/719c4db9bc79/gr10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/f8d81b57c23c/gr11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/917fcd18cc3a/gr12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/0daa5a08b55d/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/078a10c26e28/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/80adc87a751e/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/c3eab58978a2/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/b15014e987ef/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/57d0e794963b/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/fcd693899c07/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/6cad148b10b3/gr8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/c3e99b99fd9f/gr9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/719c4db9bc79/gr10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/f8d81b57c23c/gr11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/64d9/11079097/917fcd18cc3a/gr12.jpg

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