Patent ID: 9675964
Date: 2017-06-13
CPC Classifications: B01J,B22F,B82Y,C01G,C01P,C22C

Claim:
1. A method of producing a composite nanoparticle (M-A x O y ), comprising: generating, in an inert gas, an alloy (A-M) nanoparticle, which contains 0.1 at. % to 30 at. % of a noble metal (M), with the balance being a base metal (A) and inevitable impurities, and which has a particle size of 1 nm to 100 nm; heating the alloy (A-M) nanoparticle and bringing the alloy (A-M) nanoparticle into contact with a supplied oxidizing gas during transportation of the alloy (A-M) nanoparticle with the inert gas; oxidizing the base metal component (A) in the floating alloy (A-M) nanoparticle, and phase-separating into the thus-oxidized base metal component (A wherein the one noble metal particle and the one base metal oxide particle are present at a 1:1 particle number ratio, and wherein a thermal oxidation of the alloy (A-M) nanoparticle is carried out at a temperature of 400° C. or higher.