METHOD FOR MANUFACTURING METAL OXIDE NANOPOROUS BODY

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PROBLEM TO BE SOLVED : To provide a method for manufacturing a metal oxide nanoporous body which exhibits high adhesive strength when stuck to various base materials such as a honeycomb filter and has excellent heat resistance and the coating film of which to be formed on the base material can be thinned. SOLUTION : The method for manufacturing the metal oxide nanoporous body comprises the steps of : preparing a raw material fluid composition containing at least one colloidal particle of the metal oxide selected from the group consisting of alumina, zirconia, titania, iron oxides, rare earth metal oxides, alkali metal oxides and alkaline-earth metal oxides and raw materials of two or more metal oxides; mixing the raw material fluid composition so that the quantity of the particle size to be decreased (which is the ratio of (the average particle size of the mixed colloidal particles)/(that of the colloidal particles before mixed)) becomes ≥1.3, heat-treating the mixed raw material fluid composition without coprecipitating them substantially and dispersing the metal oxides uniformly on a wall body which has nanopores each having ≤10 nm diameter and constitutes nanopores. COPYRIGHT : (C)2008, JPO&INPIT