From the stoichiometry of this reaction, one CO2 molecule reacts with two amine molecules. From the adsorption isotherm of ZX10 at 298 K (Fig. 6), and considering that this sample has a molar con- centration of 2.71 mmol N/g (XPS), such sample adsorbs 0.15 mol CO2/mol N at 1bar. The hypothesis of diffusion resistance and intraparticle mass transfer of CO2 through filled pores may jus- tify this behavior. At 348K, this figure rises to 0.57mol CO2/mol N, probably because the temperature increase promotes/facilitates intracrystalline diffusion. This is approximately the same figure to be expected from the reaction stoichiometric in dry conditions (Eq. (1)).
At 10bar, this sample (ZX10) retains 0.66mol CO2/mol N at 298 K and 1.10 mol CO2 /mol N at 348 K, which suggests that, besides chemisorption, physisorption also takes place. Note that these experiments were performed with dry CO2, however there is indi- cation [29] that in the presence of water, reaction would proceed so as to form bicarbonates, in which case 1 mol CO2 would react with one mol N.
From the stoichiometry of this reaction, one CO2 molecule reacts with two amine molecules. From the adsorption isotherm of ZX10 at 298 K (Fig. 6), and considering that this sample has a molar con- centration of 2.71 mmol N/g (XPS), such sample adsorbs 0.15 mol CO2/mol N at 1bar. The hypothesis of diffusion resistance and intraparticle mass transfer of CO2 through filled pores may jus- tify this behavior. At 348K, this figure rises to 0.57mol CO2/mol N, probably because the temperature increase promotes/facilitates intracrystalline diffusion. This is approximately the same figure to be expected from the reaction stoichiometric in dry conditions (Eq. (1)).At 10bar, this sample (ZX10) retains 0.66mol CO2/mol N at 298 K and 1.10 mol CO2 /mol N at 348 K, which suggests that, besides chemisorption, physisorption also takes place. Note that these experiments were performed with dry CO2, however there is indi- cation [29] that in the presence of water, reaction would proceed so as to form bicarbonates, in which case 1 mol CO2 would react with one mol N.
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