Characterization of Cu/Al/sub 2/O/sub 3/ catalysts

Journal Article · Fri Oct 27 04:00:00 EDT 1978 · J. Catal.; (United States)

OSTI ID:6971734

Friedman, R M ^[1]; Freeman, J J; Lytle, F W

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1. Monsanto Corp

Catalysts containing 1.8-16Vertical Bar3< copper on ..gamma..-alumina were prepared by minimum solution impregnation and characterized by X-ray diffraction, diffuse reflectance, optical spectroscopy, ESCA, ESR, X-ray absorption edge shifts, and extended X-ray absorption fine structure. At low copper contents, the copper apparently enters the defect spinel of the ..gamma..-alumina support to give a well-dispersed cupric aluminate phase not detected by X-ray diffraction. In this phase most cupric ions are in a tetragonally distorted octahedral environment and approx. 10Vertical Bar3< are in tetrahedral coordination. The proportion shifts with calcination time above 600/sup 0/C towards the bulk spinel cation distribution of 60Vertical Bar3< tetrahedral and 40Vertical Bar3< octahedral. All the alumina samples studied had maximum capacities of approx. 4 wt Vertical Bar3< copper per 100 sq m/g support surface; above this loading a discrete CuO phase was formed. Copper/aluminum catalysts are used as oxidation catalysts and in automobile exhaust emission control.

• OSTI ID: 6971734
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 55:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL PREPARATION
COPPER
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
LOADING
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS HANDLING
METALS
MINERALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SPINELS
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
TRANSITION ELEMENTS
USES