The Influence of MSI (Metal-Support Interactions) and the Solvent in Liquid-Phase Reactions

Vannice, M. A.

The Pennsylvania State University (United States)

关键词: Platinum;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Catalytic Effects;    Interactions;    Oxygen;   

DOI  :  10.2172/824023
RP-ID  :  None
RP-ID  :  FG02-84ER13276
RP-ID  :  824023

美国|英语

来源: UNT Digital Library

【 摘 要 】

Results were repeatedly obtained that were consistent with a hypothesis proposed at the beginning of this program, i.e., due to Metal-Support Interactions (MSI), unique active sites can be created in the metal-support interfacial region to enhance activity and improve selectivity in certain types of reactions, especially those involving the hydrogenation of carbonyl and unsaturated C=C bonds. Higher turnover frequencies (TOF-molecule/s/site) and increased selectivity for C=O bond versus C=C bond hydrogenation was established in the hydrogenation reactions of: acetone, crotonaldehyde, acetophenone, phenylethanol, acetylcyclohexane, benzaldehyde, benzyl alcohol, phenylacetaldehyde and citral over Pt/TiO{sub 2} MSI catalysts. Higher rates of hydrogenation benzene, toluene and xylene could be obtained over certain supported Pt and Pd catalysts. Au/TiO{sub 2} catalysts were developed that were active for CO hydrogenation at subambient temperatures. The influence of support and metal crystallite size were established for the adsorption of H{sub 2}, CO and O{sub 2} on families of Pt and Pd catalysts.