Preparation of Ultrafine Platinum Dispersed Carbon Having High Spacefic Surface Area Using Potassium Hydroxide

Abstract

In order to simply prepare metal dispersed activated carbon, a soluble anisotropic pitch containing 1Owt% of platinum acetylacetonate complex as a precursor for metal particles was heat-treated in the presence of a large excess of potassium hydroxide (KOH). The heat treatment with KOH at 700-900°C enabled us to obtain highly activated carbon having more than 2000m2/g of BET specific surface area. The platinum particles pyrolytically appeared from the complex finely dispersed in activated carbon matrix. Besides their particle size was less than 1Onm in diameter, which means that the particles somewhat aggregated compared with those obtained after regular heat treatment without KOH at the corresponding temperature. To prevent the particles from aggregation, rapidly heating such as 50°C/min was effective, thereby, the particle size was able to controlled less than 3nm in diameter.