title: Amino-functionalized SAPO-34 membranes for CO2/CH4 and CO2/N2 separation.
abstract: SAPO-34 seeds and membranes were functionalized with several organic amino cations, such as ethylenediamine, hexylamine, and octylamine. The successful incorporation of the amino groups in the SAPO-34 framework was confirmed by Fourier transform infrared (FTIR) and X-ray photoemission (XPS) spectroscopies. The resultant SAPO-34 membranes were evaluated for the separation of CO2/CH4 and CO2/N2 gas mixtures. CO2/CH4 selectivities as high as 245, with CO2 permeances of ∼5 × 10(-7) mol m(-2) s(-1) Pa(-1) at 295K and 138 kPa, were observed for an optimum ethylenediamine-functionalized membrane, which corresponded to a ∼40% increase in the separation index, as compared to the nonfunctionalized SAPO-34 membrane. Similarly, the CO2/N2 separation performance was highly improved with the incorporation of ethylenediamine. CO2/N2 selectivities as high as 39, with CO2 permeances of ∼2.1 × 10(-7) mol m(-2) s(-1) Pa(-1) at 295K and 138 kPa, were observed for an optimum ethylenediamine-functionalized membrane, which corresponded to a ∼167% increase in the separation index, as compared to the nonfunctionalized SAPO-34 membrane.
authors.affiliation: Chemical Engineering Department, University of Louisville , Louisville, Kentucky 40292, United States.
authors.forename: Surendar R
authors.initials: SR
authors.lastname: Venna
authors.forename: Moises A
authors.initials: MA
authors.lastname: Carreon
mesh_terms: D000588:Amines / Q000737:chemistry*; D002245:Carbon Dioxide / Q000302:isolation & purification*; D008697:Methane / Q000302:isolation & purification*; D008958:Models, Molecular; D009584:Nitrogen / Q000302:isolation & purification*; D010316:Particle Size; D013499:Surface Properties; D017641:Zeolites / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D000588:Amines; D017641:Zeolites; D002245:Carbon Dioxide; D009584:Nitrogen; D008697:Methane