Isotopic identification of surface site transfer on Ni/Al/sub 2/O/sub 3/ catalysts

Journal Article · Thu Jul 28 04:00:00 EDT 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100326a045· OSTI ID:6254674

Gugla, P G; Bailey, K M; Falconer, J L

Isotope labeling with temperature-programmed reaction (TPR) for CO hydrogenation was used to separate two distinct CO adsorption sites on a Ni/Al/sub 2/O/sub 3/ catalysts. One site is Ni metal and has the higher activity for CO hydrogenation. The less-reactive CO is on the Al/sub 2/O/sub 3/ support. Only the Ni metal is occupied at 300 K, and transfer for CO between the two sites occurs at higher temperatures. In the presence of adsorbed H/sub 2/, CO that was adsorbed on the Ni metal moved to the Al/sub 2/O/sub 3/ support. This is an activated process, and the only pathway to occupy the Al/sub 2/O/sub 3/ sites is by adsorption on the Ni. The reverse transfer from Al/sub 2/O/sub 3/ to Ni occurs if some of the H/sub 2/ is desorbed; surface hydrogen inhibits this reverse process. These results show that during a typical TPR experiment, transfer between sites competes with reaction.

• Research Organization: Univ. of Colorado, Boulder (USA)
• OSTI ID: 6254674
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:15; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

090121 -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON 12
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
ISOTOPES
LIGHT NUCLEI
METHANATION
NICKEL COMPLEXES
NUCLEI
OXIDES
OXYGEN COMPOUNDS
SORPTIVE PROPERTIES
STABLE ISOTOPES
SURFACE PROPERTIES
TRANSITION ELEMENT COMPLEXES