Method for preparing catalysts supported on carbon nanotubes networks
View Patent ↗A new method for preparing a supported catalyst is herein provided. The supported catalyst comprises a carbon nanotube network structure containing metal catalysts. The metal catalyst may be loaded onto functionalized carbon nanotubes before forming the carbon nanotube network structure. Alternatively, the metal catalyst may be loaded onto the carbon nanotube network structures themselves.
1. A method for preparing a supported catalyst comprising the steps of:
de-aggregating aggregates of carbon nanotubes to provide de-aggregated carbon nanotubes;
functionalizing said de-aggregated carbon nanotubes to provide functionalized carbon nanotubes;
loading metal catalysts onto said functionalized carbon nanotubes to provide metal loaded carbon nanotubes; and
forming a carbon nanotube network structure from said metal loaded carbon nanotubes with a linking agent.
2. The method of claim 1 , wherein said metal catalyst is selected form the group consisting of ruthenium, osmium, rhodium, iridium, palladium, platinum, or metal oxides, metal halides, metal carbides, metal nitrides, metal phosphides and metal sulfides of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, La, Ce, W or combination thereof.
3. The method of claim 1 , wherein the steps of de-aggregating and functionalizing are accomplished concurrently by oxidizing said aggregates.
4. The method of claim 3 , wherein oxidizing said aggregates comprises contacting said aggregates with an oxidizing agent selected from the group consisting of potassium chlorate, sulfuric acid, HNO 3 , persulfate, H 2 O 2 , CO 2 , O 2 , steam, N 2 O, NO, NO 2 , O 3 , and ClO 2 .
5. The method of claim 3 , wherein oxidizing said aggregates comprises contacting said aggregates with an oxidizing agent selected from the group consisting of CO 2 , O 2 , steam, and O 3 .
6. The method of claim 1 , wherein said linking agent comprises a diamine linking agent.
7. The method of claim 6 , wherein said diamine linking agent comprises ethylenediamine.
8. The method of claim 6 , wherein said functionalized carbon nanotubes comprise carboxylated carbon nanotubes.
9. The method of claim 6 , wherein said functionalized carbon nanotubes comprise N-hydroxysuccinimide ester-activated carbon nanotubes.
10. The method of claim 9 , wherein said functionalized carbon nanotubes comprise carboxylated carbon nanotubes, and further wherein said N-hydroxysuccinimide ester-activated carbon nanotubes are formed by activating said carboxylated carbon nanotubes to an N-hydroxysuccinimide ester.
11. The method of claim 10 , wherein said activating said carboxylated carbon nanotubes to an N-hydroxysuccinimide ester comprises carbodiimide coupling using 1-ethyl-3(3-dimethylaminopropyl)-carbodiimide.