Core/shell-type catalyst particles comprising metal or...

B - Operations – Transporting – 22 – F

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Details

B22F 1/02 (2006.01) B01J 23/38 (2006.01) B01J 23/74 (2006.01) B22F 1/00 (2006.01)

Patent

CA 2661489

The invention is directed to core/shell type catalyst particles comprising a Mcore / Mshell structure with Mcore = inner particle core and Mshell = outer particle shell, wherein the medium diameter of the catalyst particle (dcore+shell) is in the range of 20 to 100 nm, 5 preferably in the range of 20 to 50 nm. The thickness of the outer shell (tshell) is about 5 to 20 % of the diameter of the inner particle core of said catalyst particle, preferably comprising at least 3 atomic layers. The inner particle core (Mcore ) of the particles com- prises metal or ceramic materials, whereas the material of the outer shell (Mshell) comprises precious metals and/or alloys thereof. The core/shell type catalyst particles are preferably supported on suitable support materials such as carbon black and can be used as electrocatalysts for fuel cells and for other catalytic applications.

La présente invention concerne des particules de catalyseur du type à noyau/enveloppe comprenant une structure Mnoyau / Menveloppe telle que Mnoyau représente le noyau de la particule et que Menveloppe représente l'enveloppe externe de la particule, le diamètre moyen de la particule de catalyseur (dnoyau+enveloppe) se situant dans la plage 20 -100 nm et de préférence dans la plage 20 -50 nm. L'épaisseur de l'enveloppe externe (tenveloppe) représente environ 5 à 20 % du diamètre du noyau interne de la particule de catalyseur et comprend de préférence au moins 3 couches atomiques. Le noyau interne de la particule (Mnoyau ) desdites particules comprend des matériaux métalliques ou céramiques alors que le matériau de l'enveloppe externe (Menveloppe) comprend des métaux précieux et/ou des alliages de ces derniers. Les particules de catalyseur du type à noyau/enveloppe sont de préférence supportées sur des matériaux de support appropriés tels que le noir de carbone et peuvent être utilisées en tant qu'électrocatalyseurs pour des piles à combustible et pour d'autres applications catalytiques.

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