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The adsorption kine...
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Ojwang, Dickson O.Stockholms universitet,Institutionen för material- och miljökemi (MMK)
(författare)
The adsorption kinetics of CO2 on copper hexacyanoferrate studied by thermogravimetric analysis
- Artikel/kapitelEngelska2018
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Elsevier BV,2018
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LIBRIS-ID:oai:DiVA.org:su-160992
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-160992URI
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https://doi.org/10.1016/j.micromeso.2018.06.019DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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The CO2 adsorption and CO2 adsorption kinetics were evaluated by thermogravimetry on two Prussian blue analogues, K2x/3CuII [Fe-x(II) Fe-1-x(III) (CN)(6)](2/3), with nominally K-free x = 0.0 and K-rich x = 1.0. Differential isosteric heats of adsorption were determined from adsorption isotherms using the Clausius-Clapeyron equation and integral values by differential scanning calorimetry. The average differential heats of CO2 adsorption are 28 kJ/mol for x = 0.0 and 33 kJ/mol for x = 1.0. Both compositions show small maxima in differential heat at similar to 1 mmol/g. The integral adsorption heats were determined to be 26 kJ/mol for both x = 0.0 and x = 1.0. The kinetic CO(2 )adsorption/desorption curves can be modeled by a double exponential function describing two parallel processes with different rate constants. The activation energies for CO2 adsorption on x = 0.0 were 6 (1) kJ/mol for the faster component and 16 (1) kJ/mol for the slower one, while the corresponding values for x = 1.0 were 9 (1) kJ/mol and 7 (1) kJ/mol, respectively. The maximum CO2 uptake for both compositions was found to be similar to 4.5 mmol/g, 19.8 wt%, at 1 bar and 273 K. The materials exhibited fast adsorption kinetics and stable cyclic performance at room temperature. The kinetics were slower for the samples with x = 1.0 than for x = 0.0 which may be attributed to interactions between CO2 molecules and K+ ions.
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Grins, JekabsStockholms universitet,Institutionen för material- och miljökemi (MMK)(Swepub:su)mat
(författare)
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Svensson, GunnarStockholms universitet,Institutionen för material- och miljökemi (MMK)(Swepub:su)gunnar
(författare)
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Stockholms universitetInstitutionen för material- och miljökemi (MMK)
(creator_code:org_t)
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Ingår i:Microporous and Mesoporous Materials: Elsevier BV272, s. 70-781387-18111873-3093
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