Process for preparing platinum based electrode catalyst for...

Details Process for preparing platinum based electrode catalyst for... Process for preparing platinum based electrode catalyst for...

2006-06-08

2010-11-09

Kastler, Scott (Department: 1793)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C423S022000, C502S325000, C502S326000

Reexamination Certificate

active

07829496

ABSTRACT:
The present invention discloses a method for preparing platinum (Pt) based nano-size catalyst which is useful as an electrode catalyst of a direct methanol fuel cell (DMFC). This method includes the implementation of a reduction reaction of a platinum precursor and an optional ad-metal precursor with a reducing agent in a solvent and in the presence of a stabilizer to form a suspension containing colloidal particles of platinum or platinum/ad-metal; mixing the suspension with a co-solvent; subjecting the resultant mixture to a centrifugal treatment to form a platinum or platinum/ad-metal colloidal particle portion and a liquid portion, repeating the co-solvent mixing and centrifugal treatment to the platinum or platinum/ad-metal colloidal particle portion until the resultant liquid portion no longer contains the product of the reduction reaction; and drying the resultant platinum or platinum/ad-metal colloidal particle portion to obtain a platinum based nano-size catalyst.

REFERENCES:
patent: 6462095 (2002-10-01), Bonsel et al.
patent: 7160525 (2007-01-01), Peng et al.
patent: 2004/0087441 (2004-05-01), Bock et al.
patent: 2006/0057502 (2006-03-01), Okada et al.
patent: WO2005/092784 (2005-10-01), None

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