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Figure 7 (a) shows the CO2 isotherms measured at 0-40 C expressed in mmol/gsample of samples C5400 and C5900. For both samples, the CO2 adsorption capacity is reduced at higher temperatures, as expected. For all temperatures, the CO2 adsorption capacity per gram sample for sample C5400 is about half of that for sample C5900, in agreement with zeolite loading and weight gain discussed above. Figure 7 (b) shows the CO2 isotherm per g sample of the NaX beads. The CO2 adsorption capacity per gram sample of the beads is about 28 or 17 times higher than for the structured adsorbents C5400 or C5900, in rough agreement with zeolite loading. At all temperatures, the CO2 adsorption capacity per unit volume of the adsorption column loaded with samples C5400 or C5900 is about 44 or 26 times lower than for the packed bed, see Table 3. For all samples, dual site Langmuir adsorption isotherms were fitted to the experimental CO2 adsorption data as shown in Figure 7 (a-b) and the fitted parameters are given in Table 2. Figure 8 (a) shows the N2 adsorption isotherms measured at 0-40 C expressed in mmol/gs for samples C5400 and C5900. Similarly as observed for CO2 adsorption, the N2 adsorption capacity of sample C5400 is about half of that for sample C5900. Figure 8 (b) shows the N2 adsorption isotherms measured at 0-40 C for NaX beads. At all temperatures, the N2 adsorption capacity per unit volume of samples C5400 or C5900 is about 54 or 30 times lower than for the packed bed. For all samples, the N2 adsorption capacity per gram sample is about 10 times lower than the CO2 adsorption capacity, as expected for CO2/N2 adsorption on zeolite X 35-36. Dual-site Langmuir isotherms were fitted to the experimental data and the fitted parameters are given in Table 2. The pressure drop (not shown here) for a column loaded with the NaX beads 21 is about 100 or 70 times higher than when the column is loaded with the structured 400 cpsi and 900 cpsi adsorbents, respectively. 122PDF Image | Structured Zeolite Adsorbents for PSA Applications
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