Advanced NMR characterization of zeolite catalysts. Fourth quarterly report, 1 June 1984-31 August 1984

Technical Report · Sat Sep 01 04:00:00 EDT 1984

OSTI ID:6361970

Welsh, L B

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 magic angle sample spinning NMR (MASS NMR) and variable angle sample spinning NMR (VASS NMR) on 500 and 360 MHz (Proton frequency) NMR spectrometers. The NMR techniques that will be emphasized are the measurement and analysis of the /sup 17/O NMR properties, /sup 27/Al NMR intensity quantitation, and /sup 27/Al and /sup 29/Si NMR relaxation rates. 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 main efforts during the fourth three-month period of the program continue to be the characterization of the /sup 17/O enriched zeolites, particularly X and Y zeolites, by both static and sample spinning /sup 17/O NMR. The main emphasis has been on obtaining NMR data with both hydrated and calcined samples and simulating the static /sup 17/O NMR line. The complex /sup 17/O NMR spectrum can be simulated by two quadrupolar spectra, one coming from oxygen in a Si-O-Si configuration and one from oxygen in an Al-O-Si configuration. Good simulations have been obtained for zeolite A (only Si-O-Al), dealuminated zeolite Y (mainly Si-O-Si) and zeolite Y with a Si/Al ratio of about 2.8. 1 figure, 1 table.

• Research Organization: Signal UOP, Inc., Des Plaines, IL (USA). Research Center
• DOE Contract Number: FG22-83PC60779
• OSTI ID: 6361970
• Report Number(s): DOE/PC/60779-4; ON: DE85000456
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM 27
ALUMINIUM ISOTOPES
CHEMICAL PREPARATION
DATA
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FAUJASITE
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MEASURING INSTRUMENTS
MINERALS
NMR SPECTRA
NMR SPECTROMETERS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
OXYGEN 17
OXYGEN ISOTOPES
RESEARCH PROGRAMS
SILICATE MINERALS
SILICON 29
SILICON ISOTOPES
SPECTRA
SPECTROMETERS
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
ZEOLITES