| http://www.w3.org/ns/prov#value | - The preferred synthetic crystalline zeolitic molecular sieves include types X, Y, L, T, and the divalent cation exchanged zeolites A, D and R. Crystalline zeolites having apparent pores sizes of at least 4.6 Angstroms are satisfactory because they permit rapid adsorption and desorption of the nitrogen molecules particularly in the lower temperature region, leading to faster operating cycles than a
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