Removal of carbon dioxide from gas mixtures using ion-exchanged silicoaluminophosphates

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United States of America Patent

PATENT NO 9623364
SERIAL NO

15245588

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Na+-SAPO-34 sorbents were ion-exchanged with several individual metal cations for CO2 absorption at different temperatures (273-348 K) and pressures (<1 atm). In general, the overall adsorption performance of the exchanged materials increased as follows: Ce3+3+2+2+++2+. The strontium exchanged materials excelled at low-pressure ranges, exhibiting very sharp isotherms slopes at all temperatures. The Sr2+ species were responsible for the surface strong interaction and the cations were occupying exposed sites (SII′) in the materials Chabazite cages. All the sorbent materials exhibited higher affinity for CO2 over the other gases tested (i.e., CH4, H2, N2 and O2) due to strong ion-quadrupole interactions. Sr2+-SAPO-34 sorbents are by far the best option for CO2 removal from CH4 mixtures, especially at low concentrations.

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UNIVERSITY OF PUERTO RICOCARRETERA #1 ESQUINA CARRERTERA #8838 SECTOR EL CINCO SAN JUAN 00926 00926

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Inventor Name Address # of filed Patents Total Citations
Arevalo-Hidalgo, Ana G Mayaguez, US 4 0
Hernandez-Maldonado, Arturo J Mayaguez, US 9 28
Rivera-Ramos, Milton E Ponce, US 3 0

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