| http://www.w3.org/ns/prov#value | - It is a preferred practice to initially impregnate the carrier material with the uranium component, for example from an aqueous uranyl nitrate solution, the uranium-impregnated carrier material being oxidized, preferably in air, at a temperature of from about 370??? C. to about 650??? C. prior to impregnation with the rhodium and platinum and/or palladium components.
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