Abstract
Modification of zeolites, based on chemisorption of silane or diborane and subsequent hydrolysis of the chemisorbed hydride groups, is studied in large port mordenite. The effective pore size can be changed in a controlled way by applying silanation and/or boranation processes under well-defined reaction conditions, such as degree of chemisorption, reaction temperature and pressure, extent of secondary reactions. As a result, the molecular sieving properties are changed in such a way that very high selectivities towards different gases (N 2 , O 2 , Ar, Kr, Xe, CO, CH 4 ) are created and very efficient gas separations are obtained on modified samples. The modification process can also be applied for encapsulating gas molecules in zeolites, and the effect of reaction conditions on the efficiency of the encapsulation is studied.
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