Preparation of supported nano-sized catalyst particles via a polyol process
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United States of America Patent
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Apr 22, 2003
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N/A
app pub date -
Jun 19, 2000
filing date -
Jun 19, 2000
priority date (Note) -
Expired
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Abstract
High activity, supported, nanosized metallic catalysts for methanol reformation and methods of fabricating such catalysts are disclosed. In one embodiment, soluble metal species are dissolved in a polyhydroxylic alcohol (polyol) solution. Platinum and ruthenium are preferred metal species. Other soluble metal species can be used, such as soluble Group 6, 7 and 8 metals. The polyol solvent is preferably a viscous alcohol, such as a diol, triol, or tetraol, to minimize particle diffusion and inhibit particle growth. The polyol solution is heated to reduce the metal(s) to a zero valent state. Typically, the heating temperature will range from 20.degree. C. to 300.degree. C., and the heating period will range from 1 minute to 5 hours. A high surface area conductive support material can be mixed with the polyol solution to form the supported catalysts in situ. Activated carbon, metals, and metal oxides, having a surface area from 20 to 2000 m.sup.2 /g, are typical support materials.
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