The structure and activity of silica-supported palladium-cobalt alloys
- Institute of Physical Chemistry of the Polish Academy of Sciences, Warsaw (Poland)
- Institute of Isotopes of the Hungarian Academy of Sciences, Budapest (Hungary)
n-Hexane and methylcyclopentane conversions appeared to be very useful tools for probing surfaces of bimetallic Pd-Co composites supported on silica. Very large changes in activity and selectivity constitute a good basis for diagnosing the extent of interaction between two metal components. The overall activity of cobalt is much higher than that of palladium; in particular, Co predominantly promotes hydrogenolysis of hydrocarbons, whereas other, nondestruction reactions are preferred over Pd and the Pd-richest alloy. A variety of information offers several [open quotes]fingerprint-like[close quotes] parameters which enable one to characterize additional properties of these composition regions (i.e., the range of 25-75 at% Co) as compared to neopentane conversion. This work confirms earlier conclusions that the employed preparation method (incipient wetness coimpregnation technique) produces well-mixed Pd-Co alloy catalysts. Individual Pd-like properties promoting C[sub 5]-cyclic skeletal reactions (ring closure, isomerization) are observed up to 25% Co content only. 28 refs., 10 figs., 2 tabs.
- OSTI ID:
- 5224159
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 143:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
ALLOYS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COBALT ALLOYS
CYCLOALKANES
HEXANE
HYDROCARBONS
ORGANIC COMPOUNDS
PALLADIUM ALLOYS
PLATINUM METAL ALLOYS