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 · Mon Aug 01 04:00:00 EDT 1988

OSTI ID:6833548

Vannice, M A

The principal objectives of our research 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 quide us in the development of new and improved catalyst systems for particular reactions.'' We chose to do this by investigating Pt and Pd dispersed on selected supports using a multifaceted approach involving DSC, TGA, NMR, adsorption, and kinetic studies of 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. Each of these aspects will be addressed. 15 refs., 4 figs.

• Research Organization: Pennsylvania State Univ., University Park (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG02-84ER13276
• OSTI ID: 6833548
• Report Number(s): DOE/ER/13276-4; ON: DE88016900
• 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
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTIONS
CHEMISORPTION
DOCUMENT TYPES
ELEMENTS
ENTHALPY
HYDROCARBONS
HYDROGENATION
MAGNETIC RESONANCE
METALS
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
PROGRESS REPORT
RESONANCE
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS