Patent ID: 8012905
Filing Date: 2011-09-06
Classification: B01J,H01M,Y02E

Abstract:
1. A method for preparing a platinum based nano-size catalyst comprising the following steps: a) carrying out 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, in order to form a suspension containing colloidal particles of platinum or platinum/ad-metal, wherein the solvent is a mixed solution of H b) mixing the resulting suspension with a co-solvent; c) subjecting the mixture of step b) to centrifugal treatment, thereby giving rise to platinum or platinum/ad-metal colloidal particle portion and a liquid portion; d) repeating the co-solvent mixing and centrifugal treatment to the platinum or platinum/ad-metal colloidal particle portion, until the resulting liquid portion substantially does not contain a product of the reduction reaction; and e) drying the platinum or platinum/ad-metal colloidal particle portion to obtain a platinum based nano-size catalyst; wherein the co-solvent is a mixture of ethylene glycol and acetone or a mixture of ethylene glycol and C