Studies of acid states formed by doping cations onto oxide surfaces: Final report

Technical Report · Mon Jun 01 04:00:00 EDT 1987

OSTI ID:6511403

Dumesic, J A

We have used quantitative gravimetric, calorimetric and spectroscopic methods to determine the number, type and strength of acid sites on metal oxides. The methods will allow future studies of quantitative relationships between surface acidity and catalytic properties of metal oxides, thereby allowing researchers to understand and prepare new catalytic materials. In our particular studies, we have determined the factors that are responsible for determining the strength of Lewis acid sites generated by depositing various metal oxides onto silica. In addition, we have identified a number of factors responsible for the generation of Bronsted acid sites on silica. From our catalytic studies of isopropanol dehydration, the catalytic activity is not simply related to the Lewis acid strength. Instead, Bronsted acid sites are more effective for this reaction than Lewis acid sites. We are currently using microcalorimetric measurements to understand further the quantitative aspects of acidity for our chosen catalytic probe reaction.

• Research Organization: Wisconsin Univ., Madison (USA)
• DOE Contract Number: FG02-84ER13183
• OSTI ID: 6511403
• Report Number(s): DOE/ER/13183-1; ON: DE87010861
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALCOHOLS
ALKALINE EARTH METALS
ALUMINIUM
BROENSTED ACIDS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CONVERSION
DEHYDRATION
ELEMENTS
GALLIUM
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ACIDS
IRON
LEWIS ACIDS
MAGNESIUM
METALS
MINERALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PROPANOLS
SCANDIUM
SILICA
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENTS
ZINC