Clinoptilolite and heulandite structural differences as revealed by multinuclear nuclear magnetic resonance spectroscopy

Journal Article · Thu Jan 27 04:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100055a031· OSTI ID:5146432

Ward, R L; McKague, H L ^[1]

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1. Lawrence Livermore National Lab., CA (United States)

Wide-line proton NMR has revealed differences in the water environment in two zeolitic isomorphs: clinoptilolite and heulandite. The proton spectrum of clinoptilolite is Gaussian in shape, while that of heulandite is a (reduced splitting) Pake doublet. Studies of clinoptilolite from five different locations and heulandite from nine different sites agree with this observation. These results suggest a simple nondestructive NMR method for distinguishing heulandite from clinoptilolite. Dehydration experiments are particularly informative. Proton line widths of clinoptilolite as a function of the dehydration temperature reveal three types of water binding, none being absorbed water. Similar studies with heulandite reveal a change from the Pake doublet to a Gaussian, which is probably associated with the heulandite to heulandite B transformation. [sup 27]Al and [sup 29]Si NMR studies of clinoptilolite indicate a change in framework structure and/or cation binding with dehydration. [sup 27]Al NMR of heulandite exhibits an increase in line width with dehydration temperature to 175[degrees]C. At this temperature the increase stops and the line width remains constant to 215[degrees]C, the maximum temperature studied. This agrees with the proton studies and is attributed to the heulandite to heulandite B transformation. [sup 29]Si NMR of heulandite reveals a framework structural change and/or cation binding with dehydration. All of these observations are reversible upon rehydration. 21 refs., 9 figs.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5146432
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:4; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
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58 GEOSCIENCES
580000 -- Geosciences
ALUMINIUM 27
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
ALUMINIUM SILICATES
CHEMICAL ANALYSIS
CLAYS
CLINOPTILOLITE
CRYSTAL STRUCTURE
DEHYDRATION
EVEN-ODD NUCLEI
HEULANDITE
HYDRATION
HYDROGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MINERALS
NATIONAL ORGANIZATIONS
NEVADA TEST SITE
NMR SPECTRA
NONDESTRUCTIVE ANALYSIS
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
SILICATE MINERALS
SILICATES
SILICON 29
SILICON COMPOUNDS
SILICON ISOTOPES
SOLVATION
SORPTION
SPECTRA
STABLE ISOTOPES
SURFACE PROPERTIES
US DOE
US ORGANIZATIONS
WATER
ZEOLITES