TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method further involves reducing the precipitated metal on the particulate support; and forming an alloy on the particulate support. The precipitated metal is reduced to its metallic oxidation state. The forming and separating steps are also performed in the container. The loading of the pre-deposited material on the particulate support is up to 90 (preferably 5-60) wt.%. The dispersion is formed using a solution comprising a first dissolved metal and a second dissolved metal, both of which are precipitated on the particulate support upon removal of heat from the dispersion. A post-deposited material is deposited onto the particulate support after the separating step. The removing step includes cooling the dispersion at a rate of at least 20 (preferably 50-100)degreesC/minute. The cryogenic liquid is at a temperature that is at least 20 degreesC below the freezing point of the solvent portion.Preferred Component: The particulate support is a particulate carbon support or a particulate electrically conductive polymer support. It comprises 1-30 (preferably 1-10) wt.% dispersion. The container has a cover that allows for a gas but no particulate support to exit from.Preferred Properties: The precipitated metal on the particulate support has a deposit size that is less than 20, preferably 2-3 nm. The pre-deposited material has a deposit size that is less than 20, preferably 2-3 nm. The particulate support has an average size of at least 100 (preferably 200-300) nm.Preferred Material: The dissolved metal is a metal-containing compound from a metal sulfate, a metal nitrate, a metal nitrite, a metal oxalate, metal acetate, or metal formate; or an inorganic metal-containing compound. The particulate support used to form the dispersion comprises a pre-deposited material from a pre-deposited metal compound and/or a pre-deposited metal in its metallic oxidation state. The post-deposited material is a pre-deposited metal compound and/or a pre-deposited metal in its metallic oxidation state.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The solvent is water (preferably), an alcohol, acetic acid, carbon tetrachloride, ammonia, 1,2 dichloroethane, N,N-dimethylformamide, or formamide. The cryogenic liquid is liquid nitrogen, liquid hexane, liquid helium, liquid argon, an ice water/hydrous calcium chloride mixture, an acetone/dry ice mixture, or a diethyl ether/dry ice mixture.    TECHNOLOGY FOCUS - METALLURGY - Preferred Component: The alloy comprises metals derived from the pre-deposited material and the precipitated metal; or metals derived from the first and second precipitated metals.Preferred Property: The alloy has a deposit size that is less than 20 (preferably 2-3) nm.