Effect of added palladium on activity of CuO in oxidation of carbon monoxide and isotope exchange of oxygen and carbon monoxide. II. Isotope exchange of CO on CuO, Pd, and palladized cupric oxide
In the reaction of homomolecular isotope exchange of CO at temperatures from -78 to 375/sup 0/C, the activities of the following catalysts have been investigated: (I) CuO; (II) CuO + 0.05% Pd; (III) CuO + 0.1% Pd; (IV) CuO + 0.2% Pd; (V) CuO + 0.5% Pd; (VI) CuO + 1% Pd; (VII) Pd sponge. On specimen I, the reaction proceeds at considerably higher rates (K) and with lower activation energies (E) than on specimen VII. The introduction of Pd into CuO leads to a nonadditive increase in catalyst activity in comparison with that of cupric oxide (by a factor of approx. 2 to 4), the observed effects depending on the content of Pd in the samples and also on the dispersity of the Pd particles. Over the range of temperatures investigated, the maximum activity is shown by sample III, which has an average size of the Pd crystals of about 30 A. Possible mechanisms are discussed for isotope exchange in CO molecules in these catalysts and for the promoting effect of Pd on the activity of CuO.
- Research Organization:
- Inst. of Chemical Technology, Moscow, USSR
- OSTI ID:
- 6198291
- Journal Information:
- Kinet. Catal. (Engl. Transl.); (United States), Vol. 21:6; Other Information: Translated from Kine. Katal.; 21: No. 6, 1494-1500(Nov 1980)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON 13
ISOTOPIC EXCHANGE
CARBON MONOXIDE
OXIDATION
COPPER OXIDES
CATALYTIC EFFECTS
OXYGEN 18
PALLADIUM
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HIGH TEMPERATURE
LOW TEMPERATURE
MEDIUM TEMPERATURE
MIXTURES
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
DATA
DIFFRACTION
DISPERSIONS
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
INFORMATION
ISOTOPES
KINETICS
LIGHT NUCLEI
METALS
MICROSCOPY
NUCLEI
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PLATINUM METALS
REACTION KINETICS
SCATTERING
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400203* - Isotope Exchange & Isotope Separation- (-1987)