A method of producing a porous metal oxide nanoparticles

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Provided is a method of producing a nanoporous metal oxide material including two or more first metal oxides selected from the group consisting of alumina, zirconia, titania, iron oxide, rare-earth oxides, alkali metal oxides and alkaline earth metal oxides. The method includes a process of preparing a fluid raw material composition containing raw materials of the two or more first metal oxides, which contains colloidal particles of at least one of the first metal oxides. What follows are processes of mixing the fluid raw material composition at a shear rate of 1000 sec -1 or more such that the change in the particle diameter in the fluid raw material composition (mean particle diameter of the colloidal particles after mixing/ mean particle diameter of the colloidal particles before mixing) is 1.3 or more, and then heat-treating the fluid raw material composition without practical coprecipitation. Thus, obtained is the nanoporous metal oxide material which has nanopores each with a diameter of 10 nm or less, and in which the metal oxides are homogeneously dispersed in a wall constituting the nanopores.