Characterization of catalysts with metal-support effects and of the species adsorbed on their surfaces: Final progress report, September 1, 1984--August 30, 1988

Technical Report · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6862175

Vannice, M A

Objectives of our current grant were: ''to gain a better understanding of the chemistry and physics which produce these metal-support effects and, as a consequence, to use this information to guide us in the development of new and improved catalyst systems for particular reactions.'' We investigated Pt and Pd dispersed on selected supports using a multifaceted approach involving DSC, TGA, NMR, adsorption, and kinetic studies of selected probe selected probe reactions. This approach has led us to the preparation of: (1) the most active Pd catalysts to date for benzene hydrogenation; (2) the most active Pt catalysts to date (by more than an order of magnitude) for acetone hydrogenation to isopropanol; and (3) the only Pt catalysts capable of significant selectivity to crotyl alcohol during crotonaldehyde hydrogenation. Calorimetric studies using DSC have shown that the principal reason for decreased chemisorption capacity on TiO/sub 2/-supported Pt and Pd is the physical blockage of metal surface by TiO/sub x/ species rather than by a large decrease in the heats of adsorption, Q/sub ad/. Also, with Pd a large crystallite size effect was found which increased Q/sub ad/ values on particles smaller than 3 nm. 4 figs.

• Research Organization: Pennsylvania State Univ., University Park (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG02-84ER13276
• OSTI ID: 6862175
• Report Number(s): DOE/ER/13276-T2; ON: DE88013753
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION HEAT
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENZENE
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DOCUMENT TYPES
ELEMENTS
ENTHALPY
HYDROCARBONS
HYDROGEN
HYDROGENATION
METALS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
PROGRESS REPORT
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SURFACES
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS