Gas Separation and Cleaning

or vapor molecules, after the degasitication process, can go through the pore structure of crystalline and ordered nanoporous materials through a series of channels and/or cavities. Each layer of these channels and cavities is separated by a dense, gas-impermeable division, and within this adsorption space the molecules are subjected to force fields. The interaction with this adsorption field within the adsorption space is the base for the use of these materials in adsorption processes. Sorption operations used for separation processes imply molecular transfer from a gas or a liquid to the adsorbent pore network [2], 

Zeolites A, -X, ZSM-5, chabazite, clinoptilolite, mordenite, and other nanoporous materials are used for removing H20, NH3, NO, N02, S02, SH2, C02, and other impurities from gas streams [2,27-37,110-114], For instance, in gas cleaning, zeolites are normally used for the removal of H20, 

The Physical Chemistry of Materials Energy and Environmental Applications 

Among natural zeolites, clinoptilolite is more profusely distributed in the earth s core, and, consequently, the most applied in adsorption applications [31]. Clinoptilolite is a member of the heulandite family, with a molar ratio Si/Al 4, and about 22 water molecules compose the unit cell, where Na, K, Ca, and Mg are the most common chargebalancing cations [31,115], 

It has also been revealed [29] that the pore size and the affinity of a zeolite structure can be modified by chemical treatment of the zeolite structure the silane, borane, or disilane molecules are chemisorbed on the zeolite surface by reacting with the silanol groups of the zeolite [113], Polar molecules, for example, water and amines presorbed in the zeolite can be used to modify the operation of the molecular sieve and the interaction toward adsorbate molecules of the zeolite [113], 

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