# US 2014/0194278 A1 · Porous silicon carbide nanocomposite structure comprising nanowires and method of preparing the same

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- Number: US 2014/0194278 A1
- Document ID: US20140194278A1
- Status: Published application
- Kind: A1
- Application number: 13/975,861
- Filed: 2013-08-26
- Published: 2014-07-10
- Earliest claimed: 2013-01-10
- Assignees: Korea Institute of Science and Technology
- Applicants: Korea Institute of Science and Technology
- Inventors: Sang Woo KIM; In Ho KIM; Dong Ju MOON
- Web page: https://patentgrep.com/patent/US20140194278A1

## CPC

- B01J 23/42: Platinum
- B01J 23/44: Palladium
- B01J 23/464: {Rhodium}
- B01J 23/50: Silver
- B01J 23/52: Gold
- B01J 23/72: Copper
- B01J 23/745: Iron
- B01J 23/75: Cobalt
- B01J 23/755: Nickel
- B01J 35/58: Fabrics or filaments
- B01J 35/613: {10-100 m2/g}
- B01J 35/633: {less than 0.5 ml/g}
- B01J 35/647: {2-50 nm}
- B01J 37/0009: {Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

Provided are a porous silicon carbide nanocomposite structure comprising nanowires that are self-formed, a preparation method thereof, and a catalyst comprising the same, in which the catalyst with excellent activity may be prepared by uniformly supporting a catalytically active component in meso-macro pores and nanowires.

## Claims

### Claim 1

A silicon carbide nanocomposite structure comprising:
a silicon carbide nanocomposite having a meso-macro pore structure; and
a Si—Al—O-based nanowire formed on a surface of and inside the silicon carbide nanocomposite.

### Claim 2 (depends on 1)

The silicon carbide nanocomposite structure according to claim 1, wherein the silicon carbide nanocomposite structure comprises silicon carbide, an inorganic binder, and transition metal nanoparticles.

### Claim 3 (depends on 1)

The silicon carbide nanocomposite structure according to claim 1, wherein the nanowire comprises Si as a main component, and Al and O elements.

### Claim 4 (depends on 1)

The silicon carbide nanocomposite structure according to claim 1, wherein the meso pore has a diameter from 2 to 50 nm and a pore volume is from 0.05 to 2 cm3/g.

### Claim 5 (depends on 1)

The silicon carbide nanocomposite structure according to claim 1, wherein the macro pore has a diameter from 50 to 5,000 nm and a pore volume is from 0.05 to 20 cm3/g.

### Claim 6 (depends on 1)

The silicon carbide nanocomposite structure according to claim 1, wherein the nanowire has a diameter from 10 to 100 nm.

### Claim 7 (depends on 1)

The silicon carbide nanocomposite structure according to claim 1, wherein the inorganic binder is aluminum oxide, silicon oxide, or magnesium oxide.

### Claim 8 (depends on 1)

The silicon carbide nanocomposite structure according to claim 1, wherein the transition metal nanoparticles are nickel or cobalt.

### Claim 9 (depends on 1)

A method of preparing the silicon carbide nanocomposite structure according to claim 1, the method comprising:
forming a composite comprising silicon carbide, an inorganic binder, and transition metal nanoparticles by treating a mixture comprising a silicon carbide particle, an inorganic binder precursor, and a transition metal precursor with supercritical carbon dioxide;
adding a binder to the composite and then molding the binder-added composite, to thus obtain a molded body; and
sintering the molded body.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the treating of the mixture comprising a silicon carbide particle, an inorganic binder precursor, and a transition metal precursor with supercritical carbon dioxide is performed by first treating the silicon carbide particles and the inorganic binder precursor with supercritical carbon dioxide, adding the transition metal precursor thereto, and then again treating the mixture with supercritical carbon dioxide, or
mixing the silicon carbide particle, the inorganic binder precursor, and the transition metal precursor and treating the mixture with supercritical carbon dioxide at a time.

### Claim 11 (depends on 9)

The method according to claim 9, wherein the forming of a composite comprising silicon carbide, an inorganic binder, and transition metal nanoparticles by treating the mixture with supercritical carbon dioxide comprises
obtaining a uniformly mixed fluid after introducing the mixture into a supercritical carbon dioxide reactor; and
forming the composite comprising silicon carbide, the inorganic binder, and the transition metal nanoparticles by warming and pressurizing the mixed fluid in the supercritical reactor.

### Claim 12 (depends on 9)

The method according to claim 9, wherein the inorganic binder precursor is one or more selected from aluminum nitrate, aluminum chloride, aluminum sulfate, aluminum acetate, aluminum oxalate, aluminum formate, aluminum propionate, and aluminum alkoxide.

### Claim 13 (depends on 9)

The method according to claim 9, wherein the inorganic binder precursor is used in an amount to provide a weight ratio of the silicon carbide and the inorganic binder of from 1:9 to 9:1, when the inorganic binder is formed by the reaction of the inorganic binder precursor.

### Claim 14 (depends on 9)

The method according to claim 9, wherein the transition metal precursor is one or more selected from nickel nitrate, nickel chloride, nickel sulfide, nickel oxalate, nickel citrate, nickel formate, and nickel acetate.

### Claim 15 (depends on 9)

The method according to claim 9, wherein the composite is molded into a form of cylindrical or spherical bead.

### Claim 16 (depends on 9)

The method according to claim 9, wherein the supercritical carbon dioxide treatment is performed at a temperature from 30 to 300° C. and a pressure from 0.5 to 30 bar.

### Claim 17 (depends on 9)

The method according to claim 9, wherein when the sintering is performed at 800 to 1,300° C.

### Claim 18 (depends on 1)

A catalyst comprising:
the silicon carbide nanocomposite structure according to claim 1; and
a catalytically active component supported by the silicon carbide nanocomposite structure.

### Claim 19 (depends on 18)

The catalyst according to claim 18, wherein the catalytically active component is one or more selected from Ni, Co, Pt, Pd, Rh, Cu, Fe, Ag, and Au.

### Claim 20 (depends on 1)

A method of preparing a catalyst, the method comprising:
supporting a catalytically active component precursor by the silicon carbide nanocomposite structure according to claim 1; and
subjecting the silicon carbide nanocomposite structure by which the catalytically active component precursor is supported to heat treatment under a hydrogen gas atmosphere.

### Claim 21 (depends on 20)

The method according to claim 20, further comprising performing a supercritical carbon dioxide treatment prior to the heat treatment.