WFRF:(Ojwang Dickson)
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The adsorption kinetics of CO2 on copper hexacyanoferrate studied by thermogravimetric analysis
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- Ojwang, Dickson (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Grins, Jekabs (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Svensson, Gunnar (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
- (creator_code:org_t)
- English.
- Other publication (other academic/artistic)
Abstract
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- The CO2 adsorption and CO2 adsorption kinetics were evaluated by thermogravimetry on two Prussian blue analogues, K2x/3CuII[FeIIx FeIII1-x(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 ~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 CO2 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 ~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.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Inorganic Chemistry
- oorganisk kemi
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- vet (subject category)
- ovr (subject category)
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