Nature of active sites in catalytic zeolites and metal dichalcogenide inclusion complexes

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6320334

Suib, S L

Applications of zeolites include oil spill cleanup and petroleum refining. Zeolite ZSM-5 catalyzes methanol conversion to gasoline. Studies were made on the active sites, and the thermal, ion exchange, electronic, and chemical properties, by Moessbauer, EPR, luminescence lifetime, and EXAFS spectroscopy on europium-exchanged zeolites A, X, Y, and ZSM-5. The europium zeolite catalyzes thermolytic water dissociation by a process which probably involves europium conversion between the 2+ and 3+ oxidation states. X-ray spectroscopy differences between the surface and interior of zeolites may influence the determination of zeolite selectivity; this was studied by Auger electron spectroscopy in order to observe metal migration and reduction. A study of the isomerization of 1-butene by europium zeolites showed the influence of the silica-alumina ratio, extent of europium exchange, activation pretreatment conditions, structural integrity, cation migration, and impurity levels.

• OSTI ID: 6320334
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AUGER ELECTRON SPECTROSCOPY
CATALYSIS
CHALCOGENIDES
CHEMICAL ACTIVATION
CHEMICAL PROPERTIES
ELECTRON SPECTROSCOPY
ELEMENTS
EUROPIUM
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
RARE EARTHS
SPECTRA
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
USES
X-RAY SPECTRA
ZEOLITES