Lanthana-promoted Rh/SiO/sub 2/. I. Studies of CO and H/sub 2/ adsorption and desorption

Journal Article · Fri Jan 01 04:00:00 EST 1988 · J. Catal.; (United States)

OSTI ID:5469151

Underwood, R P; Bell, A T

Promotion of a Rh/SiO/sub 2/ catalyst with lanthana results in a partial coverage of the supported Rh crystallites with LaO/sub x/ islands. These moieties reduce the capacity of Rh to adsorb CO but have little effect on the chemisorption of H/sub 2/ because of spillover of H atoms from the exposed Rh sites onto the surface of the LaO/sub x/ islands. At elevated temperatures, the LaO/sub x/ islands promote the dissociation of CO. It is proposed that this process occurs preferentially at Rh sites located along the perimeter of the LaO/sub x/ islands. Support for this interpretation is provided by infrared spectra of CO adsorbed on lanthana-promoted Rh/SiO/sub 2/. 40 references.

• Research Organization: Lawrence Berkeley Lab., CA
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5469151
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 109:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010408* -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DESORPTION
DISSOCIATION
ELEMENTS
HYDROGEN
HYDROGENATION
INFRARED SPECTRA
KINETICS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
METALS
METHANATION
MINERALS
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PROMOTERS
RARE EARTH COMPOUNDS
REACTION KINETICS
RHODIUM
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENTS