Far infrared study of cation motion in dry and solvated mono- and divalent zeolites x and y. Technical report

Technical Report · Thu Mar 10 04:00:00 EST 1977

OSTI ID:7220866

Butler, W M; Angell, C L; McAllister, W; Risen, Jr, W M

Far infrared ion motion bands have been observed and assigned in the spectra of dry synthetic zeolites X and Y containing Li/sup +/, Na/sup +/, K/sup +/, Rb/sup +/, Cs/sup +/, Ag/sup +/, Ca2/sup +/, Sr2/sup +/, and Ba2/sup +/ cations. The site I' and site II cation vibrational bands overlap and form the strongest feature in the spectra of samples exchanged with monovalent ions. The site I cation band appears at lower frequency than the site II envelope in these samples, but in divalent ion exchanged zeolites the opposite order occurs. A very low frequency site III cation band, typical of monovalent X zeolites, has been observed in CsY. For a given cation, the frequency on X is higher than on Y due to the higher framework charge of X zeolites. The vibrational frequencies also follow an approximate m raised to minus 1/2 power dependence for the two types of cation and the two forms of the zeolite. Solvation of the monovalent zeolites with H/sub 2/O, THF, DMSO, pyridine, and CH/sub 2/Cl/sub 2/ results in the appearance of a new band at higher frequency than the ion-framework modes which concurrently diminish in intensity, especially the site III band. The high frequency band is due to ion motion in a solvation shell which is unsymmetric at low hydration levels and at all solvation levels with organic adsorbates.

• Research Organization: Brown Univ., Providence, RI (USA). Dept. of Chemistry
• OSTI ID: 7220866
• Report Number(s): AD-A-038665
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400200* -- Inorganic
Organic
& Physical Chemistry
ALKALI METALS
ALKALINE EARTH METALS
BAND THEORY
CATIONS
CHARGED PARTICLES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FAR INFRARED RADIATION
INFRARED RADIATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
METALS
MINERALS
RADIATIONS
SOLVATION
VIBRATIONAL STATES
ZEOLITES