Binary- and Pure-Component Adsorption of CO₂, H₂O, and C₆H₁₄ on SSZ-13

Abstract

Adsorption isotherms on Na-SSZ-13, a small-pore zeolite, for pure-component adsorbates CO2, H2O, and C6H14 were measured using a gravimetric adsorption instrument with a temperature range between 30 and 100 °C. These isotherm data were fit to a multisite Langmuir adsorption model. Using the same gravimetric adsorption instrument, binary adsorption isotherms for the adsorbate pairs CO2–H2O and CO2–C6H14 were measured with a temperature range between 30 and 80 °C. These data demonstrated that the increasing loading of either H2O or C6H14 impacted the loading of CO2 on Na-SSZ-13. The binary isotherm data were compared with ideal adsorbed solution theory and showed relatively good agreement between the data and modeling.

Zinc Containing Small‐Pore Zeolites for Capture of Low Concentration Carbon Dioxide

“…Simultaneously, the adsorption efficiency, i.e., CO 2 per Zn ion, gradually decreases with the increase of Zn ion loading. Nitrogen physisorption results show that the micropore volume of parent CHA7 is 0.24 cm 3 g −1 , being consistent with previously reported values of SSZ‐13 [35] . The micropore volumes declines upon loading of Zn ions, and comparable micropore volumes (0.18–0.21 cm 3 g −1 , Table S3) are obtained for Zn‐CHA7 with Zn ion density lower than 6.60/U.C.…”

“…Nitrogen physisorption results show that the micropore volume of parent CHA7 is 0.24 cm 3 g À1 ,being consistent with previously reported values of SSZ-13. [35] Them icropore volumes declines upon loading of Zn ions,a nd comparable micropore volumes (0.18-0.21 cm 3 g À1 ,T able S3) are obtained for Zn-CHA7 with Zn ion density lower than 6.60/U.C.T hus, the distinct behaviors at the three stages,a sw ell as the variations of CO 2 capacities,a re due to the speciation of Zn ions.T he environments and states of Zn ions were examined to understand the CO 2 adsorption behavior.A ss hown in Figure 4b,t wo new FTIR features are seen at ca. 902 and The composition of the CO 2 gas for adsorption under both dry and humid conditions is ca.…”

“…Zeolites already have shown promising performance for CO 2 capture in post-combustion carbon capture processes as well as CO 2 removal in air pre-purification processes (including the international space station, where adesiccant bed is used prior to the zeolite bed for CO 2 capture). [9,23,28,29] Although numerous zeolites have been investigated for carbon capture, [30][31][32][33][34][35] the research for capture of low concentrations of CO 2 (ca. 400 ppm) is scarce,a nd has mainly been focused on low-silica zeolites of the FAU-type (Si/Al less than 2).…”

Zinc Containing Small‐Pore Zeolites for Capture of Low Concentration Carbon Dioxide

“…Nitrogen physisorption results show that the micropore volume of parent CHA7 is 0.24 cm 3 /g, being consistent with previously reported values of SSZ-13. [35] The micropore volumes declines upon loading of Zn ions, and comparable micropore volumes (0.18-0.21 cm 3 /g, Table S3) are obtained for Zn-CHA7 with Zn ion density lower than 6.60/U.C. Thus, the distinct behaviors at the three stages, as well as the variations of CO2 capacities, are due to the speciation of Zn ions.…”

“…Zeolites already have shown promising performance for CO2 capture in postcombustion carbon capture processes as well as CO2 removal in air pre-purification processes (including the international space station, where a desiccant bed is used prior to the zeolite bed for CO2 capture ). [9,23,28,29] Although numerous zeolites have been investigated for carbon capture, [30][31][32][33][34][35] the research for capture of low concentrations of CO2 (ca. 400 ppm) is scarce, and has mainly been focused on low-silica zeolites of the FAU-type (Si/Al less than 2).…”