Deposition of dispersed metal particles onto substrates using supercritical fluids
First Claim
1. A method for producing metal particles or mixed metal particles dispersed on a particulate substrate comprisinga. exposing an organometallic and the particulate substrate to a supercritical or near supercritical fluid under conditions to form a mixture of the fluid and the organometallic,b. allowing the mixture to remain in contact with the substrate for a time sufficient to deposit dispersed organometallic onto the substrate,c. venting the mixture,d. thereby adsorbing the organometallic onto the substrate, and thene. reducing the dispersed organometallic to dispersed metal particles with a reducing agent.
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Abstract
A method for producing dispersed metal particles on a substrate and the compositions produced is disclosed. A method for producing the particles comprises exposing an organometallic and a particulate substrate to supercritical or near supercritical fluid under conditions to form a mixture of the fluid and the organometallic, allowing the mixture to remain in contact with the substrate for a time sufficient to deposit dispersed organometallic onto the substrate, venting the mixture, thereby adsorbing the organometallic onto the substrate, and reducing the dispersed organometallic to dispersed metal particles with a reducing agent.
93 Citations
31 Claims
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1. A method for producing metal particles or mixed metal particles dispersed on a particulate substrate comprising
a. exposing an organometallic and the particulate substrate to a supercritical or near supercritical fluid under conditions to form a mixture of the fluid and the organometallic, b. allowing the mixture to remain in contact with the substrate for a time sufficient to deposit dispersed organometallic onto the substrate, c. venting the mixture, d. thereby adsorbing the organometallic onto the substrate, and then e. reducing the dispersed organometallic to dispersed metal particles with a reducing agent.
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30. A method for producing particulate substrate-supported dispersed metallic particles comprising
a. mixing an organometallic in a supercritical or near supercritical fluid to form a mixture, b. exposing a particulate substrate to the mixture of a) under supercritical or near supercritical conditions for a period of time sufficient to deposit dispersed organometallic on the substrate, c. venting the mixture, d. thereby adsorbing the organometallic onto the substrate, and then e. reducing the organometallic to dispersed metal particles with a reducing agent.
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31. A method for producing particulate substrate-supported dispersed metallic particles comprising
a. adding a particulate substrate and an organometallic to a reactor, b. adding a supercritical fluid to the reactor to form a mixture with the organometallic, c. allowing the organometallic to remain in contact with the substrate for a time sufficient to deposit dispersed organometallic onto the substrate, d. venting the reactor, e. thereby adsorbing the organometallic onto the substrate, and then f. adding a gaseous reducing agent to the reactor, and g. contacting the reducing agent and organometallic until the organometallic is reduced to dispersed metal particles.
Specification