| 摘要 |
<p>A method of processing a composite oxide containing molybdenum and cobalt (e.g. from waste catalysts) by mixing the oxide an aqueous extracting solution obtained by dissolving at least one of ammonia, an ammonia forming material or an organic base in water, thereby extracting molybdenum and cobalt into an aqueous phase. The aqueous phase can then be dried and calcined to form a composite oxide. Ammonia forming materials include ammonia carbonate, ammonia bicarbonate and urea. The organic base can be an aliphatic amine such as mono-, di- or tri- methylaimine, ethylamine or allylamine, an aromatic amine or a quaternary ammonium compound. The method can be used to form composite oxide catalysts containing molybdenum and cobalt for the production of unsaturated aldehydes and carboxylic acids by heat treating the calcined mixed oxide in the presence of a reducing material such as hydrogen, ammonia, carbon monoxide, or C1-6hydrocarbons, alcohols, aldehydes or amines.</p> |
