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6199868 
Journal Article 
Hydrogen purification using a SAPO-34 membrane 
Hong, Mei; Li, S; Falconer, JL; Noble, RD 
2008 
Yes 
Journal of Membrane Science
ISSN: 0376-7388 
307 
2 
277-283 
WOS:000252568900013 
A SAPO-34 membrane separated CO2/H2 and H2/CH4 mixtures at feed pressures up to 1.7MPa. Strong CO2 adsorption inhibited H2 adsorption and decreased H2 permeances significantly, especially at low temperatures, so that CO2 preferentially permeated and CO2/H2 selectivities were higher at low temperatures. At 253K, CO2/H2 separation selectivities were greater than 100 with CO2 permeances of 3×10−8molm−2s−1Pa−1. The CO2/H2 separation exceeded the upper bounds (selectivity–permeability plot) for polymer membranes. The SAPO-34 membrane separated H2 from CH4 because CH4 is close to the SAPO-34 pore size and has a lower diffusivity than H2. The H2/CH4 separation selectivity had a small maximum with temperature, and decreased slightly with feed pressure and CH4 feed concentration. 
gas separation; zeolite membrane; SAPO-34; hydrogen purification; carbon dioxide; methane