SUPPORTED NANOPARTICLE CATALYST,申请号EP20020806593-传众专利搜索

SUPPORTED NANOPARTICLE CATALYST

申请公布号：EP1450948(A2)

申请号：EP20020806593

申请日期：2002.10.01

申请公布日期：2004.09.01

申请人：

3M INNOVATIVE PROPERTIES COMPANY

发明人：MAO, SHANE, S.;MAO, GUOPING

分类号：B01J35/02;B01J21/18;B01J23/42;B01J23/46;B01J35/00;B01J37/02;B01J37/03;H01M4/86;H01M4/88;H01M4/92;H01M8/10

主分类号：B01J35/02

摘要：A supported catalyst is provided comprising catalyst metal nanoparticles having an average particle size of 3.0 nm or less, or more typically 2.0 nm or less, and typically having a standard deviation of particle size of 0.5 nm or less, which are supported on support particles at a loading of 30% or more. Typical catalyst metals are selected from platinum, palladium, ruthenium, rhodium, iridium, osmium, molybdenum, tungsten, iron, nickel and tin. Typical support particles are carbon. A method of making a supported catalyst is provided comprising the steps of: a) providing a solution of metal chlorides of one or more catalyst metals in solvent system containing at least one polyalcohol, typically ethylene glycol containing less than 2% water; b) forming a colloidal suspension of unprotected catalyst metal nanoparticles by raising the pH of the solution, typically to a pH of 10 or higher, and heating said solution, typically to 125 ° C. or higher; c) adding support particles to the colloidal suspension; and d) depositing the unprotected catalyst metal nanoparticles on the support particles by lowering the pH of said suspension, typically to a pH of 6.5 or lower.