Effects of oxygen vacancy of yttria-stabilized zirconia support on carbon monoxide oxidation over copper catalyst

Journal Article · Sun May 01 04:00:00 EDT 1994 · Journal of Catalysis; (United States)

OSTI ID:7107441

Dow, Wei-Ping; Huang, Ta-Jen ^[1]

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1. National Tsing Hua Univ., Taiwan (China)

CO oxidation activity was measured at atmospheric pressure and at temperatures of 300 to 450[degrees]C over copper catalysts supported on 6.8 mol% yttria-stabilized zirconia (YSZ). Fresh, high-temperature reduced with CO, and reoxidized catalysts were investigated using two reacting atmospheres, oxygen lean and oxygen rich. Temperature-programmed reduction using CO as reducing gas was employed to characterize the dispersion and the copper oxide species of catalysts before and after the reaction. Results were discussed in light of the occupancy of surface oxygen vacancies of YSZ bulk oxygen vacancies of YSZ support, and the interfacial Cu[sub 2]O formation owing to surface oxygen vacancies of YSZ support. These also suggest that geometric interfacial metal-support interaction can enhance the activity of copper catalyst by improving the dispersion and stabilizing the interfacial Cu[sub 2]O through the oxygen vacancies of support. A mechanism in which oxygen vacancies of YSZ support can protect the interfacial Cu[sub 2]O to avoid further reduction or oxidation has been proposed. The occurrence of penetration, redispersion, and split of copper species crystallites has also been explained by an oxygen vacancy model. 69 refs., 12 figs., 2 tabs.

• OSTI ID: 7107441
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 147:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010408 -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER
ELEMENTS
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES