公开(公告)号：EP2671846A4

公开(公告)日：2017-11-22

申请号：EP12741532

申请日：2012-02-02

Applicant: NAT INST ADVANCED IND SCIENCE & TECH

Inventor： KOGA KENJI ,  HIRASAWA MAKOTO ,  SAKURAI HIROAKI ,  KOSHIZAKI NAOTO

IPC: C01G7/00 ,  B01J23/62 ,  B01J23/89 ,  B82Y30/00 ,  B82Y40/00 ,  C01G55/00

CPC classification number: B01J23/8926 ,  B01J23/42 ,  B01J23/52 ,  B01J23/56 ,  B01J23/62 ,  B01J23/63 ,  B01J23/66 ,  B01J35/0013 ,  B01J37/14 ,  B01J37/34 ,  B22F1/0018 ,  B22F1/02 ,  B22F9/12 ,  B22F9/14 ,  B22F2999/00 ,  B82Y30/00 ,  B82Y40/00 ,  C01G3/00 ,  C01G7/00 ,  C01G19/02 ,  C01G55/00 ,  C01P2002/84 ,  C01P2004/03 ,  C01P2004/62 ,  C22C1/02 ,  C22C5/00 ,  C22C5/02 ,  C22C5/04 ,  B22F1/0088 ,  B22F2201/03

Abstract: Provided is a clean production method of: producing, with good reproducibility, a composite nanoparticle, which has one high purity noble metal nanoparticle combined with one oxide nanoparticle; and being capable of generating a heterointerface uniformly, with avoiding, for example, residual poisoning substances. Characterized is that a composite nanoparticle (M-A x O y ) is produced by: 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 (preferably 1 nm to 100 nm), to heat the alloy (A-M) nanoparticle and to bring the alloy nanoparticle into contact with a supplied oxidizing gas during transporting the alloy nanoparticle with the inert gas, to oxidize the base metal component (A) in the alloy (A-M) nanoparticle floating in the gases, and to phase separate into the thus-oxidized base metal component (A x O y ) and the noble metal component (M), to thereby obtain a composite nanoparticle (M-A x O y ).