Method for encapsulating nanoparticles in a zeolite matrix
| DWPI Title: Metal nanocluster composite material preparation, e.g. used in hydrogen electro-oxidation, involves treating porous zeolitic material with metal compound solution, and contacting metal ion-exchanged zeolitic material with organic monomer |
| Abstract: A method for preparing a metal nanocluster composite material. A porous zeolitic material is treated with an aqueous metal compound solution to form a metal ion-exchanged zeolitic material, heated at a temperature ramp rate of less than 2° C./min to an elevated temperature, cooled, contacted with an organic monomer and heating to induce polymerization, and heating the composite material to greater than 350° C. under non-oxidizing conditions to form a metal nanocluster-carbon composite material with nanocluster sizes between approximately 0.6 nm and 10 nm. |
| Use: The method is useful for preparing metal nanocluster composite material used in as catalyst, e.g. in electro-oxidation of hydrogen and electro-reduction of oxygen in fuel cells and in commercialization of fuel cell powered vehicles. |
| Advantage: The method provides material is highly conductive carbon metal compound zeolite composite from which the zeolite can be optionally removed. The contacting of metal compound zeolite material with organic compound allows stabilization of metal compound nanoclusters and provides way for electrical conduction required for electrocatalyst. The removal of zeolite phase by acid or base treatment provides improvement in electro-activity of catalyst as measured by standard electrochemical techniques. The method allows nanocluster size to be controlled by controlling heat rate with slower heating rates to yield smaller sizes. |
| Novelty: Metal nanocluster composite material preparation comprises treating porous zeolitic material with aqueous metal compound solution, heating and cooling metal ion-exchanged zeolitic material, contacting metal ion-exchanged zeolitic material with organic monomer, removing air from metal ion-exchanged zeolitic material using vacuum treatment, inducing polymerization of the monomer, and heating polymer composite material to greater than 350°C under non-oxidizing conditions. |
| Filed: 2/26/2004 |
| Application Number: US2004788020A |
| Tech ID: SD 7389.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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