Competitive hydrogenation of benzene and toluene on group VIII metals: correlation with the electronic structure

Journal Article · Mon Dec 01 04:00:00 EST 1986 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(86)90182-X· OSTI ID:5662459

Phuong, T T; Massardier, J; Gallezot, P

It has been shown previously that the ratio K/sub T/B/ of the adsorption coefficients of toluene and benzene determined from a kinetic analysis of the competitive hydrogenation of these hydrocarbons can be used to probe the electronic structure of platinum. Because toluene is more of an electron donor than benzene, the larger the electron deficiency of platinum, the larger the K/sub T/B/ values. In the present work the use of competitive hydrogenation has been extended to other Group VIII metals. This was intended to unveil possible relations between the intrinsic electronic structure of these metals (e.g., the density of states in the d-band) and the K/sub T/B/ ratios. The reactions were carried out on Ru, Rh, Pd, Os, Ir, and Pt. Since previous studies have shown that the K/sub T/B/ ratios are sensitive to modifications of the electronic structure induced by the particle environment, these side effects should be kept as low as possible. Accordingly all the catalysts were prepared on silica which is one of the most inert of supports. The particle sizes were essentially in the range 2-5 nm to minimize potential size effects on the electronic structure. It was also checked that the catalysts contain a negligible amount of sulfur, chlorine, and alkali metals liable to induce electron transfer with the metal. 8 references.

• Research Organization: Universite Claude Bernard Lyon I, Villeurbanne, France
• OSTI ID: 5662459
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 102:2; ISSN JCTLA
• 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
ADSORPTION
ALKYLATED AROMATICS
AROMATICS
BENZENE
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COMPETITION
CORRELATIONS
ELECTRONIC STRUCTURE
ELEMENTS
HYDROCARBONS
HYDROGENATION
IRIDIUM
METALS
MINERALS
ORGANIC COMPOUNDS
OSMIUM
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PARTICLE SIZE
PLATINUM
PLATINUM METALS
RHODIUM
RUTHENIUM
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SORPTION
SYNTHESIS
TOLUENE
TRANSITION ELEMENTS