... . it is the sodium form of the Type A crystal structure. 4A molecular sieve has an effective pore opening of about ... adsorb, in sequence of adsorption rate, argon, krypton, xenon, ammonia, carbon monoxide, C2H4, C2H2, CH3OH, C2H5OH, CH3CN2, CS2, CH3CL, CH3Br, and ... carbon dioxide.Deep drying of air, natural gas, alkane and refrigerant. ...