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Carbon dioxide adsorbs reversibly on a silica gel containing 3-aminopropyl groups bonded to surface atoms of silicon. These act as the active sites for the chemisorption of CO 2 at room temperature which is liberated by temperature programmed desorption at about 100°C. The material is capable of adsorbing about 10 STP cm 3 of dry CO 2 per gram and can be regenerated upon...
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