# US 2014/0194280 A1 · Nox purification catalyst

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0194280 A1
- Document ID: US20140194280A1
- Status: Published application
- Kind: A1
- Application number: 14/209,164
- Filed: 2014-03-13
- Published: 2014-07-10
- Earliest claimed: 2014-03-13
- Assignees: Cambridge Enterprise Limited; Toyota Jidosha Kabushiki Kaisha
- Inventors: Mayuko OSAKI; Hirohito HIRATA; Naoyuki HARA; Brian JOHNSON; Andrew WHEATLEY; Helen SKELTON; Muriel LEPAGE
- Web page: https://patentgrep.com/patent/US20140194280A1

## CPC

- B01J 23/8906: {Iron and noble metals}
- B01D 53/9413: {Processes characterised by a specific catalyst}
- B01J 35/393: {Metal or metal oxide crystallite size}
- B01J 35/45: Nanoparticles
- B01D 2255/106: Gold
- B01D 2255/20738: Iron
- B01D 2255/9202: Linear dimensions
- B01D 2258/012: Diesel engines and lean burn gasoline engines
- B01J 37/0018: {Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)}
- B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- B01J 2235/15: X-ray diffraction
- B01J 2235/30: Scanning electron microscopy; Transmission electron microscopy
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

The present invention relates to a catalyst able to exhibit an NOx purification performance at a low temperature and/or in an oxidizing atmosphere, that is, a nitrogen oxides purification catalyst composed of particles having an average particle size of 0.2 to 100 nm and including gold atoms and iron atoms in a state of close proximity.

## Claims

### Claim 1

A nitrogen oxide purification catalyst comprising particles having an average particle size of 0.2 to 100 nm and including gold atoms and iron atoms in a state of close proximity.

### Claim 2 (depends on 1)

A catalyst as set forth in claim 1, wherein said gold atoms and iron atoms are included in a state of close proximity wherein at least one of the gold atoms is contiguous with at least one of the iron atoms in primary particles that are nanoparticles.

### Claim 3 (depends on 1)

A catalyst as set forth in claim 1, wherein the composition of said Au and Fe is Au:Fe=7:93 to 91:9 (at %).

### Claim 4 (depends on 1)

A catalyst as set forth in claim 1, wherein a composition of said Au and Fe is Au:Fe=8:92 to 26:74 (at %).

### Claim 5 (depends on 1)

A catalyst as set forth in claim 1, wherein said nanoparticles are supported on a metal oxide carrier.

### Claim 6 (depends on 1)

A catalyst as set forth in claim 1, wherein said average particle size is 0.2 to 30 nm.