A NOx occlusion reduction type catalyst composite particle precursor aq. NOx occlusion reduction typ

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PROBLEM TO BE SOLVED : To provide an aqueous solution of composite particle precursor which contains metal elements, precursors of composite particles, at a high concentration in a stable state in an aqueous solution and enables sufficiently fine composite particles having sufficiently high NOxtreatment capability to be produced efficiently. SOLUTION : The aqueous solution of composite particles contains : a first compound containing at least one metal element selected from a group consisting of alkali metals and alkaline earth metals; a second compound containing at least one metal element selected from a group consisting of titanium, aluminum, zirconium, and rare earth metals; a third compound having multidentate ligand; a fourth compound containing at least one metal element selected from a group consisting of platinum, rhodium, palladium, gold, silver, copper, cobalt, iron, manganese, and nickel; and ammonia. COPYRIGHT : (C)2008, JPO&INPIT