Coconut shell derived activated carbon for effective separation of greenhouse gases

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-04-25 DOI:10.1016/j.ijrefrig.2025.04.022

Julio E. Sosa, Rui.P.P.L. Ribeiro , Inês Matos, Maria Bernardo, Isabel M. Fonseca, José P.B. Mota, João M.M. Araújo, Ana B. Pereiro

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Abstract

The development of efficient adsorbent materials for the selective capture of greenhouse gases (GHGs) is crucial. The porosity and surface area of the materials are key factors for the GHGs separation. This study demonstrates how waste from coconut shell (CS) biomass can be used to design novel biomaterials (CS-CO₂, CS-ZnCl₂) with enhanced GHG selectivity. A comparison with activated carbon monoliths (ACM) and a metal-organic framework (Fe-BTC) was carried out to assess the impact of different porous matrices on GHGs capture. The adsorption equilibrium of R-32, R-125, R-134a, R-143a, CO₂, and CH₄ on these materials was measured between 283.15–323.15 K. The adsorption isotherms obtained were fitted using the dual-site Langmuir model. For R-32, R-125, R-134a and R-143a, the adsorption capacity follows ACM > CS-ZnCl₂ > Fe-BTC > CS-CO₂ due to the decrease of the surface area. The CO₂ adsorption capacity is ACM > Fe-BTC > CS-ZnCl₂ > CS-CO₂, which is related to the micropore volume. In this case, CS-CO₂ has a smaller adsorption capacity but is similar to ACM and outperforms Fe-BTC at P < 0.4 MPa. The selectivity of R-410A, R-407C, R-404A, and CO₂/CH₄ blends was determined with the Ideal Adsorbed Solution Theory (IAST). CS-ZnCl₂ shows a higher selectivity for R-125 over R-32 in R-410A and R-407C separations due to its larger pore volume. CS-CO₂ predominantly adsorbs R-134a and R-143a over R-125 in R-404A separation. ACM preferentially adsorbs CO₂ over CH₄ due to its large, elongated micropores. This study introduces innovative materials that improve GHGs separation and help reduce emissions.

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椰壳衍生活性炭，可有效分离温室气体

开发高效的吸附材料来选择性捕获温室气体是至关重要的。材料的孔隙率和表面积是影响温室气体分离的关键因素。本研究展示了如何利用椰子壳（CS）生物质废料设计具有增强温室气体选择性的新型生物材料（CS- co2, CS- zncl2）。通过活性炭单体（ACM）和金属有机骨架（Fe-BTC）的比较，评估了不同多孔基质对温室气体捕获的影响。在283.15 ~ 323.15 K范围内测得R-32、R-125、R-134a、R-143a、CO2和CH4在这些材料上的吸附平衡。所得吸附等温线采用双点Langmuir模型拟合。对R-32、R-125、R-134a和R-143a的吸附量符合ACM >；CS-ZnCl2祝辞Fe-BTC祝辞CS-CO2由于表面积的减少。CO2吸附量为ACM >；Fe-BTC祝辞CS-ZnCl2祝辞CS-CO2，与微孔体积有关。在这种情况下，CS-CO2具有较小的吸附容量，但与ACM相似，并且在P <下优于Fe-BTC；0.4 MPa。用理想吸附溶液理论（IAST）测定了R-410A、R-407C、R-404A和CO2/CH4共混物的选择性。CS-ZnCl2具有较大的孔体积，在R-410A和R-407C中对R-125的选择性高于R-32。在R-404A分离中，CS-CO2主要吸附R-134a和R-143a，而不是R-125。由于其大而细长的微孔，ACM优先吸附CO2而不是CH4。这项研究引入了创新材料，提高了温室气体的分离，有助于减少排放。

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来源期刊

International Journal of Refrigeration-revue Internationale Du Froid 工程技术-工程：机械

CiteScore

7.30

自引率

12.80%

发文量

363

审稿时长

3.7 months

期刊介绍： The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.