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Zn+ cations, probable Tl4Zn12 and Tl6 clusters, and zeolite desilication (less likely dealumination): crystallographic study of the incomplete reaction of Zn vapor with TI+-exchanged zeolite X

Article Abstract:

Issues concerning the use of single-crystal X-ray diffraction to study exchangeable cations in zeolites are presented.

Observations, Crystallography, X-rays, X-ray diffraction, Cations

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Structure of dehydrated Zn2+-exchanged zeolite X. overexchange, framework dealumination and reorganization, stoichiometric retention of monomeric tetrahedral aluminate

Article Abstract:

Fully dehydrated single crystals of Zn2+-exchanged zeolite X were prepared by ion exchange using an aqueous solution at 80 degrees Centigrade resulted in over-exchange due formally to the uptake of Zn(OH)2. As the temperature rose to 400 degrees Centigrade, evacuation caused the zeolite framework to lose aluminate and to reconstruct itself to become enriched in silicon. Moreover, the zeolite has lost its long-range Si/Al ordering, leading to the change of space group from Fd3 to Fd3m. Some, perhaps all, of the lost aluminate have been retained to fill sodalite cavities with Zn7-(HAl04)10+ and similar clusters somewhat poorer in Zn2+ and richer in H+.

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Crystal structure of anhydrous NH4+-exchange zeolite X partially reacted with HgCI2 vapor. Cationic Chloromercuric clusters, regular Octahedral Hg(II), and regular trigonal Hg(II)

Article Abstract:

Issues concerning the use of single-crystal X-ray diffraction to investigate the product of the reaction of fully NH4+-exchanged zeolite X and HgCI2 are discussed.

Research and Development in the Physical, Engineering, and Life Sciences, All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Chemistry, Zeolites, Analysis, Chemical research

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