| 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 DEG 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. |