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    • 6. 发明申请
    • Supported nanoparticle catalyst
    • 负载纳米粒子催化剂
    • US20050009696A1
    • 2005-01-13
    • US10703751
    • 2003-11-07
    • Shane MaoGuoping Mao
    • Shane MaoGuoping Mao
    • B01J35/02B01J21/18B01J23/42B01J23/46B01J35/00B01J37/02B01J37/03H01M4/86H01M4/88H01M4/92H01M8/10
    • H01M4/92B01J21/18B01J23/42B01J23/462B01J35/0013B01J37/0203B01J37/0211B01J37/031H01M4/926H01M8/1004H01M2008/1095Y02P70/56
    • 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.
    • 提供了一种负载型催化剂,其包含平均粒径为3.0nm以下,更通常为2.0nm以下的催化剂金属纳米颗粒,通常具有0.5nm以下的粒径的标准偏差,负载在载体颗粒上 装载30%以上。 典型的催化剂金属选自铂,钯,钌,铑,铱,锇,钼,钨,铁,镍和锡。 典型的载体颗粒是碳。 提供一种制备负载型催化剂的方法,包括以下步骤:a)在含有至少一种多元醇(通常含有少于2%水的乙二醇)的溶剂体系中提供一种或多种催化剂金属的金属氯化物溶液; b)通过将溶液的pH提高至10或更高的pH而形成未保护的催化剂金属纳米颗粒的胶态悬浮液,并将所述溶液加热至125℃或更高; c)将胶体悬浮液中的载体颗粒加入; 和d)通过降低所述悬浮液的pH,将未保护的催化剂金属纳米颗粒沉积在载体颗粒上,通常达到6.5或更低的pH。