Double rotation NMR studies of zeolites and aluminophosphate molecular sieves

Thesis/Dissertation · Thu Jul 01 00:00:00 EDT 1993

DOI:https://doi.org/10.2172/10125116· OSTI ID:10125116

Jelinek, Raz ^[1]

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1. Univ. of California, Berkeley, CA (United States)

Goal is to study the organization and structures of guest atoms and molecules and their reactions on internal surfaces within pores of zeolites and aluminophosphate molecular sieves. ²⁷Al and ²³Na double rotation NMR (DOR) is used since it removes the anisotropic broadening in NMR spectra of quadrupolar nuclei, thus increasing resolution. This work concentrates on probing aluminum framework atoms in aluminophosphate molecular sieves and sodium extra framework cations in porous aluminosilicates. In aluminophosphates, ordering and electronic environments of the framework ²⁷Al nuclei are modified upon adsorption of water molecules within the channels; a relation is sought between the sieve channel topology and the organization of adsorbed water, as well as the interaction between the Al nuclei and the water molecules. Extra framework Na⁺ cations are directly involved in adsorption processes and reactions in zeolite cavities.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10125116
• Report Number(s): LBL--34881; ON: DE94007032
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
665100
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
ALUMINIUM 27
ALUMINIUM PHOSPHATES
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
DOUBLE RESONANCE METHODS
MOLECULAR SIEVES
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS
POROUS MATERIALS
SODIUM 23
SORPTIVE PROPERTIES
STRUCTURAL CHEMICAL ANALYSIS
STRUCTURE AND PHASE STUDIES
WATER
ZEOLITES