Krypton encapsulation

The crystal stmcture of a krypton encapsulate of partially Cs" -exchanged LTA was determined at ambient conditions after treatment at 400 °C and 635 atm.l It showed one JCr atom in the sodalite cavity, less than one Angstrom from its center, and four Kr atoms in the large cavity. The latter were arranged to form a rhombus, nearly a square, with dipoles induced by approaches to framework oxygens and Na" " cations alternating. The structure of... 

Parsons, R.M. and D.A. Knecht.1994. Designdocumentation Krypton encapsulation preconceptual design. INEL94/0054 UC-150. 

Modification of zeolites, based on chemisorption of silane or diborane and subsequent hydrolysis of the chemisorbed hydride groups can also be applied for encapsulating gas molecules in zeolites. For example, krypton and xenon can be encapsulated in mordenite combining the modification process with a physical adsorption of the noble gases at moderate pressures and temperatures (e.g. 100 kPa, 300 K). The encapsulates are homogeneous and stable towards acids, mechanical grinding and y-irradiation. By controlling the pore size reduction however, the thermal stability can be controlled. 

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