Carbon monolith supported nanoparticle catalysts

Patent metadata

Field	Value
Publication number	US-9468922-B1
Application number	US-201514737085-A
Country	US
Kind code	B1
Filing date	Jun 11, 2015
Priority date	Jun 11, 2015
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

Pyrolysis of machined osseous tissue results in a monolith of carbon interwoven within the HA scaffold native to the original tissue. This HA framework prevents the collapse of the carbon to dense forms during pyrolysis. Upon removal of the HA scaffold after pyrolysis, a monolith that preserves the macroscopic form of the carbon remains. The monolith is placed in a solution of catalyst, noble metal ions for example, which is then reduced to facilitate the precipitation of nanoparticles of the catalyst. The novelty of this invention is that a high number of particles are contained within a relatively small, extremely high surface area solid support. The current invention demonstrates that the pyrolysis of intact bovine cortical bone produces high-carbon-surface-area monoliths, which can be used as a scaffold for reusable catalysts.

First claim

The invention claimed is:

1. A catalyst comprising a support scaffold of pyrolyzed osseous tissue having a high carbon surface area and a plurality of catalyzing nanoparticles deposited thereon; wherein said pyrolyzed osseous tissue comprises a section of bone.

2. The catalyst of claim 1 wherein said pyrolyzed osseous tissue has been pyrolyzed at < about 1200° C.

3. The catalyst of claim 1 wherein said pyrolyzed osseous tissue has a carbon surface area of at least 1000 m2/g as measured by the BET method.

4. The catalyst of claim 3 wherein said pyrolyzed osseous tissue has a carbon surface area of at least 1400 m2/g as measured by the BET method.

5. The catalyst of claim 1 wherein said catalyzing nanoparticles are noble metal nanoparticles.

6. The catalyst of claim 5 wherein said catalyzing nanoparticles are Pt, Pd, Au, or combinations thereof.

7. The catalyst of claim 1 wherein any hydroxyapatite present in said pyrolyzed osseous tissue has been removed.

8. A catalyst loaded osseous tissue monolith comprising a pyrolyzed osseous tissue scaffold comprising a section of bone which has been pyrolyzed at < about 1200° C. and a plurality of noble metal nanoparticles.

9. A process for creating a monolithic heterogeneous catalyst comprising:
supplying at least one section of osseous tissue comprising a section of bone;
heating said osseous tissue to a temperature < about 1200° C. to form a porous structure of carbon/hydroxyapatite composite;
placing said carbon/hydroxyapatite composite in a solution of catalyst; and,
treating said solution to facilitate the precipitation of nanoparticles of said catalyst.

10. The process of claim 9 wherein said heating is performed at a temperature up to about 1000° C.

11. The process of claim 9 wherein after said heating, said hydroxyapatite is removed from said composite.

Assignees

• Goodman Paul A
• Us Navy

Inventors

• Goodman Paul A

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J37/084 Primary

  Decomposition of carbon-containing compounds into carbon · CPC title

• B01J35/1028

  Operations & Transport · mapped topic