Influence of activated carbon surface chemistry and porosity on vapour adsorption
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Micropore Structure of Artificial GraphiteC. N. SpalarisCite this: J. Phys. Chem. 1956, 60, 11, 1480–1483Publication Date (Print):November 1, 1956Publication History Published online1 May 2002Published inissue 1 November 1956https://pubs.acs.org/doi/10.1021/j150545a003https://doi.org/10.1021/j150545a003research-articleACS PublicationsRequest reuse permissionsArticle Views202Altmetric-Citations14LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts
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The interactions between gases and carbon surfaces by chemisorption, reaction, and physical adsorption processes are reviewed. The crystael structure of graphite and of the amorphous carbons and the transitions in structure that occur during carbonization and graphitization processes were investigated. Chemisorption studies were made on amorphous carbons. Physical adsorption on heat-treated carbon blacks was also investigated. For the purpose of correlating adsorptive characteristics with the chemical composition of the surface, adsorption studies were made with carbon blacks and charcoals modified by heat- treatment in the absence of air and by oxidation, reduction, and steaming. The effect of alkali metuls and other inorganic modifiers on the adsorptive capacity of charcoal was also examined. The effects of activation and sintering on the structure and physical properties of charcoals and carbon blacks were investigated. Structural modifications of graphites by gas adsorption and intercalation were studied. (M.C.G.)
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Molecular simulations were performed to investigate the adsorption and diffusion properties of methane and carbon dioxide in carbon nanotubes (CNTs) with preadsorbed water at 300 K and pressures up to 40 bar. Our results show that, at low pressures, a high uptake of methane and carbon dioxide is obtained in relatively small pores, and the presence of water enhances the adsorption of carbon dioxide in CNTs with large diameters. The effect of preadsorbed water is more pronounced on the mobility of methane than that of carbon dioxide. Importantly, at high water contents, we see that the mobility of methane is a nonmonotonic function of the nanotube diameter. This is probably due to the splitting of the water clusters in the small pores, which may lead to a faster diffusion process. Simulations were also performed for the methane/carbon dioxide mixture in CNTs with preadsorbed water. Here, the overall adsorption and diffusion properties are similar to those observed for the methane/water and carbon dioxide/water mixtures in CNTs. The adsorption selectivity of carbon dioxide over methane increases with water content, which may be because of the relatively stronger water–carbon dioxide interactions. A significant result is that the mobility of methane in CNTs decreases with decreasing bulk mole fraction of methane. In general, this decrease is more pronounced at higher loadings of methane and lower water contents. However, the presence of methane has less effect on the diffusion properties of carbon dioxide in CNTs. These results may be explained by the preferential adsorption of carbon dioxide over methane in the CNTs. Furthermore, these simulated adsorption isotherms and diffusivity results are in reasonable agreement with the theoretical predictions based on the ideal adsorbed solution theory and the Krishna and Paschek approach, respectively.
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Calcium oxide incorporated porous carbon materials were synthesized by the impregnation method to study CO2 adsorption and separation of CO2/CH4. The X-ray diffraction, Raman analysis, N2 isotherms at 77 K, and SEM with EDX analysis were used to characterize synthesized materials. XRD and N2 isotherm results have confirmed that synthesized carbon has porosity, and EDX analysis has reported that the presence of CaO on porous carbon. 10CaO/porous carbon has shown 31 cm3 g-1 of CO2 adsorption which was higher than bare porous carbon CO2 adsorption 17.5 cm3 g-1 at 298 K, 1 bar. It was attributed to electrostatic interaction between CaO and CO2. However, CH4 adsorption was decreased by a decrease in surface area. The selectivity of CO2/CH4 was higher for 10CaO/porous carbon and the heat of CO2 adsorption was 36 KJ/mol at high adsorption of CO2. Moreover, CO2 adsorption was the same in each adsorption cycle.
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