Nanoparticle catalysts for conversion of cyclohexanol to cyclohexanone
Methods for converting an alcohol, such as cyclohexanol to a ketone, such as cyclohexanone, include reacting the alcohol in the presence of a catalyst and oxygen to produce the ketone. In one exemplary embodiment, the catalyst comprises a microporous copper chloropyrophosphate framework including a plurality of noble metal nanoparticles. In one exemplary embodiment, the noble metal nanoparticles include at least one metal selected from the group consisting of platinum, palladium, and gold.
1. A method of converting an alcohol to a ketone, comprising:
reacting the alcohol in the presence of a catalyst and oxygen to produce the ketone, wherein the catalyst comprises a microporous copper chloropyrophosphate framework including a plurality of noble metal nanoparticles.
2. The method of claim 1 , wherein the alcohol is a cyclic alcohol.
3. The method of claim 2 , wherein the alcohol is cyclohexanol and the ketone is cyclohexanone.
4. The method of claim 3 , further comprising providing a mixture of cyclohexanone and cyclohexanol, wherein the provided cyclohexanol is reacted in said reacting step.
5. The method of claim 4 , wherein the mixture comprises 5 wt. % to 95 wt. % cyclohexanol, based on the total weight of the cyclohexanol and cyclohexanone.
6. The method of claim 4 , wherein the mixture comprises 40 wt. % to 60 wt. % cyclohexanol, based on the total weight of the cyclohexanol and cyclohexanone.
7. The method of claim 1 , wherein the noble metal nanoparticles include at least one metal selected from the group consisting of platinum, palladium, and gold.
8. The method of claim 1 , wherein the noble metal nanoparticles include at least two metals selected from the group consisting of platinum, palladium, and gold.
9. A catalyst comprising a bimetallic microporous copper chloropyrophosphate framework including a plurality of platinum and gold noble metal nanoparticles, the microporous copper chloropyrophosphate framework having a general formula of Rb 9 Cu 6 (P 2 O 7 ) 4 Cl 4 (AuCl 4 )Rb 9 Cu 6 (P 2 O 7 ) 4 Cl 3 (PtCl 4 ).
10. The catalyst of claim 9 , wherein the catalyst has been activated at a temperature of about 300° C.
11. A method of making a catalyst, the method comprising:
mixing copper (II) fluoride, orthophosphoric acid, rubidium hydroxide, rubidium chloride, and at least one source of metal chloride;
heating the mixture in a sealed container to form a catalyst precursor including precursor complexes; and
activating the catalyst by heating the catalyst precursor at a temperature of at least 175° C. to converting the precursor complexes to noble metal nanoparticle sites.
12. The method of claim 11 , wherein the source of metal chloride is selected from the group consisting of K 2 PtCl 4 , K 2 PdCl 4 , HAuCl 4 , and KAuCl 4 .