Advanced NMR characterization of zeolite catalysts. Third quarterly report, March 1-May 31, 1984
The program discussed in this report is a two-year two-phase joint UOP-University of Illinois study of the application of improved high resolution solid state nuclear magnetic resonance (NMR) techniques to the characterization of zeolite catalysts. During the first phase of this program very pure, and in some cases isotopically enriched faujasites will be prepared and studied by majic angle sample spinning NMR (MASS NMR) and variable angle sample spinning NMR (VASS NMR) on 500 and 360 MHz (Proton frequency) NMR spectrometers. During the second phase of this program these NMR techniques will be used to study the effects of impurity concentration, dealumination treatments and cation exchange on the NMR properties of faujasites. The initial emphasis of this program during Phase I is on the preparation and measurement of the NMR properties of /sup 17/O enriched Na-Y faujasites. The effort in each phase is broken into four tasks: (1) zeolite preparation. (2) standard zeolite characterization; (3) measurement of zeolite NMR properties; and (4) analysis of NMR data. The main efforts during the third three month period of the program have been the characterization of the /sup 17/O enriched zeolites, particularly X and Y zeolites, by high resolution sample spinning /sup 17/O NMR, and the preparation of additional /sup 17/O enriched zeolites. X and Y zeolites with Si/Al framework ratios from 1.22 to 7.6 have been prepared in either the Na, NH/sub 4/ or Ba form. MASS NMR and VASS NMR as well as static NMR measurements have been made on these materials for /sup 17/O NMR frequencies from 20.4 to 67.8 MHz. Computer simulations of the experimental NMR lineshapes are in progress. Results to date indicate that the observed spectra arise from two different types of oxygen sites, possibly O in Al-O-Si links and chemically bound OH groups. 2 references, 1 figure, 1 table.
- Research Organization:
- Signal UOP, Inc., Des Plaines, IL (USA). Research Center
- DOE Contract Number:
- FG22-83PC60779
- OSTI ID:
- 6754293
- Report Number(s):
- DOE/PC/60779-3; ON: DE84014115
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ZEOLITES
CHEMICAL PREPARATION
NMR SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
ALUMINIUM 27
ALUMINIUM OXIDES
EXPERIMENTAL DATA
NMR SPECTROMETERS
OXYGEN 17
RESEARCH PROGRAMS
SILICA
SILICON 29
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
CHALCOGENIDES
DATA
EVEN-ODD NUCLEI
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MEASURING INSTRUMENTS
MINERALS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
SILICON COMPOUNDS
SILICON ISOTOPES
SILICON OXIDES
SPECTRA
SPECTROMETERS
STABLE ISOTOPES
SYNTHESIS
400201* - Chemical & Physicochemical Properties