Cs2O in the supercages of Cs-impregnated X and Y zeolites attacks the siliceous portions of the lattice (siloxane bridges), with formation of (Si–O–Cs+)2 groups which allow the occlusion (reversible at high temperature) of CO in the sodalite units, as indicated by the formation of an IR band at 2150 cm–1.
E. Garrone, N. Russo, P. Marturano, P. Marturano, B. Onida, F. Di Renzo and M. Laspéras, Chem. Commun., 1998, 1717 DOI: 10.1039/A803829E
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