Microstructural and spectroscopic investigations of the supported copper-alumina oxide system: Nature of aging in oxidizing reaction media

Journal Article · Tue Mar 31 23:00:00 EST 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90338-I· OSTI ID:6975806

Tikhov, S F; Sadykov, V A; Kryukova, G N; Paukshtis, E A; Popovskii, V V; Starostina, T G; Kharlamov, G V; Anufrienko, V F; Poluboyarov, V F; Razdobarov, V A; Bulgakov, N N; Kalinkin, A V ^[1]

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1. Academy of Sciences, Novosibirsk (Russian Federation)

By means of electron microscopy, infrared spectroscopy of adsorbed CO, XPS, and ESR the state of the copper oxide component of the Cu-Al-O system (CuO/[gamma]-Al[sub 2]O[sub 3] and bulk CuAl[sub 2]O[sub 4] catalysts) has been investigated. Several types of copper-oxygen entities were detected on the catalyst surfaces: isolated ions, weak magnetic associates, two- and three-dimensional clusters, defect CuO phase. The dependence of their distribution on compositon, preparation, and pretreatment conditions and their reducibility by carbon monoxide have been analyzed. The enthalpy of oxygen adsorption on copper atoms in various structures has been calculated by a semiempirical, interacting-bond method. The most reactive species are three-dimensional clusters reducing to Cu[sup 0] by CO even at 163 K. Prolonged treatment in reaction media (CH[sub 3]OH, CH[sub 2]O, O[sub 2] at 673-873 K) annealed extended defects in CuO particles and destroyed the clusters, forming perfect CuO particles and bulk aluminate.

• OSTI ID: 6975806
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 134:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALCOHOLS
ALDEHYDES
ALUMINATES
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COPPER
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELECTRON SPIN RESONANCE
ELEMENTS
FORMALDEHYDE
HYDROXY COMPOUNDS
INFRARED RADIATION
MAGNETIC RESONANCE
METALS
METHANOL
MICROSCOPY
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
REDUCTION
RESONANCE
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY SPECTROSCOPY