Main > GASES > Gas Separation Membranes > Org.: USA. Uc. (Zeolite.: CH4/CO2) > Work Description

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THE ZEOLITE used by the team, known as SAPO-34, contains silica, alumina, and phosphate, and it has an eight-membered ring. CO2 is the smaller molecule and adsorbs more strongly than CH4 in this type of zeolite. "These SAPO-34 membranes are 5 µm thick, and their pores are similar in size to the CH4 molecule so that CO2 preferentially permeates". "We have obtained high CO2 selectivities at 30 atm and 50 °C."

In a recent paper, the team showed that as the pressure drop across the membrane increases, both CO2 flux and CO2 permeate concentration increase for a 50-50 mixture of the two gases. However, the separation selectivity decreases as temperature increases.




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