Characterization of platinum-zirconium alloys by competitive hydrogenation of toluene and benzene

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

DOI:https://doi.org/10.1016/0021-9517(86)90008-4· OSTI ID:5251012

Szymanski, R; Charcosset, H; Gallezot, P; Massardier, J; Tournayan, L

The catalytic activities of Pt and Pt/sub 1-x/Zr/sub x/ catalysts (0 less than or equal to x less than or equal to 0.25) supported on C or ZrO/sub 2/ have been studied in the hydrogenation of benzene either pure or in competition with toluene. The turnover frequencies of C/sub 6/H/sub 6/ hydrogenation are not sensitive to the alloy composition. In contrast, the ratio K/sub T/B of the adsorption coefficients of toluene and benzene, derived from kinetic analysis of the competitive hydrogenation of these hydrocarbons, increases linearly with the alloy composition x. Since toluene is more of an electron donor than benzene, the higher the values of K/sub T/B, the higher the number of unoccupied states in the Pt d band. This is consistent with an electron transfer from Pt to Zr in agreement with the Engel-Brewer theory. The catalytic activity of Pt/sub 0.75/Zr/sub 0.25/ poisoned with sulfur is more easily regenerated because the electron-deficient platinum is less strongly bonded with electrophilic sulfur

• Research Organization: l'Universite Claude Bernard Lyon I, Villeurbanne (France)
• OSTI ID: 5251012
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 97:2; 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
ALKYLATED AROMATICS
ALLOYS
AROMATICS
BENZENE
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
ELECTRON TRANSFER
ELEMENTS
HYDROCARBONS
HYDROGENATION
METALS
NONMETALS
ORGANIC COMPOUNDS
PLATINUM
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
PLATINUM METALS
POISONING
REGENERATION
SULFUR
SURFACE PROPERTIES
TOLUENE
TRANSITION ELEMENTS
ZIRCONIUM ALLOYS