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Adsorption equilibrium of carbon dioxide on zeolite 13X at high pressures 3. RESULTS As a result of measurements, the adsorption isotherms for carbon dioxide–zeolite 13X system were deter- mined at temperatures: 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 under pressures up to 2 MPa. All isotherms are type I according to the IUPAC classification (Keller and Staudt, 2005). The multitemperature adsorption isotherm models of Toth, Langmuir–Freundlich, and Langmuir were fit- ted to the experimental data. The obtained values of isotherm parameters are shown in Tables 2 through 4. Average relative errors δ and coefficients of determination R2 for all the equilibrium models are presented in Table 5. Table 2. Adsorption isotherm parameters for the Toth model Parameters qm, mol/kg b0T , Pa−n nT , – ∆H, J/mol Table 3. Adsorption isotherm parameters for Langmuir–Freundlich model Parameters a0LF , mol/kg a1LF , mol·K/kg a2LF , mol·K2/kg b0LF , Pa−n b1LF , Pa−n·K b2LF , Pa−n·K n0LF , – n1LF , – Table 4. Adsorption isotherm parameters for Langmuir model Parameters qm, mol/kg a1L, mol/kg·Pa b1L, Pa−1 c1L, K Value 6.437 576.902 0.464 31864.04 Value 6.159 13.673 0.567 −11.28 2912.8 17.37 1.03 −144.97 Value 1.641 378.063 0.0003 1514.889 The experimental and correlated by the Toth model isotherms for the studied adsorption system at var- ious temperatures and under pressures up to 2 MPa and up to 0.1 MPa are presented in Figs. 3 and 4, respectively. http://journals.pan.pl/dlibra/journal/98834 315PDF Image | ADSORPTION EQUILIBRIUM OF CARBON DIOXIDE ON ZEOLITE
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