Process for preparing fine metal oxide particles

Details Process for preparing fine metal oxide particles Process for preparing fine metal oxide particles

2007-06-26

2007-06-26

Vanoy, Timothy C. (Department: 1754)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S263000, C423S622000, C423S594190, C423S604000, C423S632000, C423S608000, C423S635000, C423S639000, C423S605000, C423S631000, C423S625000, C977S773000, C977S775000, C977S811000

Reexamination Certificate

active

10521642

ABSTRACT:
Disclosed is a process for preparing fine metal oxide particles, comprising the following steps of reacting a reactant mixture comprising i) water, ii) at least one water-soluble metal nitrate and iii) ammonia or ammonium salt at 250–700° C. under 180–550 bar for 0.01 sec to 10 min in a reaction zone to synthesize the metal oxide particles, the metal nitrate being contained at an amount of 0.01–20 wt % in the reactant mixture; and separating and recovering the metal oxide particles from the resulting reaction products. According to the present invention, nano-sized metal oxide particles are synthesized, while the harmful by-products generated concurrently therewith are effectively decomposed in the same reactor.

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Philip C. Dell'Orco et al. “Reactions of Nitrate Salts with Ammonia in Supercritical Water” Ind. Eng. Chem. Res., vol. 36, No. 7, pp. 2547-2557, (1997).

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