Advanced NMR characterization of zeolite catalysts. Final technical report

Technical Report · Sat Mar 01 00:00:00 EST 1986

OSTI ID:5471644

Welsh, L B; Oldfield, E

The effort described in this report involved a joint industry-university program between the Signal Research Center, Inc., and the University of Illinois, designed to advance the state of knowledge of zeolite catalyst characterization technology for application to zeolite catalysts useful in coal liquefaction related processes. The program involved the application of new and improved high resolution solid state nuclear magnetic resonance (NRM) techniques to the characterization of zeolite catalysts and other related microporous materials. The NMR experiments were performed in the state-of-the-art NMR laboratory at the University of Illinois. In this report the first comprehensive investigation of /sup 17/O NMR of A and Y zeolites by means of static, MASS and VASS (variable angle sample spinning) NMR techniques is presented. The determination of the /sup 17/O isotropic chemical shifts, nuclear quadrupole coupling constants and electric field gradient tensor asymmetry parameters provides valuable supplementary information on zeolite structure. As an extension of the /sup 17/O NMR investigation of zeolites, results for gallosilicates and for several aluminophosphate materials have also been obtained. The work presented in this study demonstrates the ability of using /sup 17/O NMR to observe chemical changes in the oxygen environment of zeolites. This has important implications for the study of zeolite based catalysts. Chemical modifications of catalysts, such as framework substitutions or ion exchange which are commonly used to modify zeolite catalyst activity can be directly studied for their effect on the oxygen rich surface of the zeolite. It is also possible that this technique could be used to directly probe the interactions between the zeolite surface and reactant molecules. 29 refs., 14 figs., 7 tabs.

• Research Organization: Allied-Signal, Inc., Des Plaines, IL (USA). Engineered Materials Research Center
• DOE Contract Number: FG22-83PC60779
• OSTI ID: 5471644
• Report Number(s): DOE/PC/60779-T2; ON: DE86014827
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
01 COAL, LIGNITE, AND PEAT
CATALYSTS
CHEMICAL PREPARATION
STRUCTURAL CHEMICAL ANALYSIS
COAL LIQUEFACTION
ZEOLITES
LABELLING
NMR SPECTRA
CHEMICAL SHIFT
EXPERIMENTAL DATA
ISOTOPIC EXCHANGE
NUCLEAR MAGNETIC RESONANCE
OXYGEN 17
RESEARCH PROGRAMS
SILICON 29
X-RAY DIFFRACTION
COHERENT SCATTERING
DATA
DIFFRACTION
EVEN-ODD NUCLEI
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
LIQUEFACTION
MAGNETIC RESONANCE
MATERIALS
MINERALS
NUCLEI
NUMERICAL DATA
OXYGEN ISOTOPES
RESONANCE
SCATTERING
SILICON ISOTOPES
SPECTRA
STABLE ISOTOPES
SYNTHESIS
THERMOCHEMICAL PROCESSES
400201* - Chemical & Physicochemical Properties
010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction