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Adsorption equilibrium of carbon dioxide on zeolite 13X at high pressures All isotherms at 323.15 K are type I according to the IUPAC classification. Our research and results obtained by Cavenati et al. (2004) gave the highest adsorption capacity of 5.51 mol/kg for 2000 kPa and 5.76 for 3395 kPa, respectively. In other measurements the values of the highest adsorption capacity of 3.44 mol/kg for 137.8 Pa, 3.34 mol/kg for 99.1 kPa, 4.08 mol/kg for 391 kPa, 3.18 mol/kg for 42.5 kPa obtained by Hyun and Danner (1982), Maring and Webley (2013), Merel et al. (2008) and Wang and LeVan (2009), respectively were reported. 4. CONCLUSIONS The adsorption isotherms of carbon dioxide on zeolite 13X were measured at 293.15 K, 303.15 K, 313.15 K, 323.15 K, 333.15 K, 348.15 K, 373.15 K, 393.15 K and pressures up to 2 MPa. The selected multitemperature equilibrium models of Toth, Langmuir–Freundlich and Langmuir were correlated with the experimental equilibrium data. The analysis of average relative errors δ and coefficients of determina- tion R2 of models fitting to experimental data showed that the best agreement was obtained for the Toth model (δ 8.57% and R2 = 0.9948). The fitting quality was the best for partial pressure range limited to 0.1 MPa (Fig. 4). In the whole studied pressure range the calculated isotherm values were underestimated in comparison with measured values obtained at temperatures of 373.15 K and 395.15 K within pressure ranged from 0.5 to 2 MPa (Fig. 3). It was shown that zeolite 13X is characterized by high adsorption capacity and it can be used in the process of carbon dioxide capture. The highest measured adsorption capacity of 6.04 mol/kg was achieved at 293.15 K and 2 MPa. The results of our research were compared with those obtained by other authors for two temperatures: 293.15 K and 323.15 K at 2 MPa. In most cases distinct discrepancies between them were observed (Figs. 6 and 8) except the isotherm determined experimentally by Wang and LeVan (2009) for carbon dioxide adsorption onto zeolite 13X at 323.15 K (Fig. 8). Differences in obtained results can be caused by different properties of the used adsorbent or different conditions of adsorbent regeneration. Experimental and simulation results can be used for modeling of cyclic adsorption processes, for example temperature swing adsorption (TSA) or pressure swing adsorption (PSA). They can also be the basis for modeling multicomponent adsorption equilibrium using interpolative models. SYMBOLS a0LF Langmuir–Freundlich isotherm parameter, mol/kg a1L Langmuir isotherm parameter, mol/kg·Pa a1LF Langmuir–Freundlich isotherm parameter, mol/kg·Pa a2LF Langmuir–Freundlich isotherm parameter, mol·K2 /kg b0LF Langmuir–Freundlich isotherm parameter, Pa−n b0T Toth isotherm parameter, Pa−n b1L Langmuir isotherm parameter, Pa1 b1LF Langmuir–Freundlich isotherm parameter, Pan ·K b2LF Langmuir–Freundlich isotherm parameter, Pan ·K c1L Langmuir isotherm parameter, K nT Toth isotherm parameter http://journals.pan.pl/dlibra/journal/98834 319PDF Image | ADSORPTION EQUILIBRIUM OF CARBON DIOXIDE ON ZEOLITE
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