# US 12,214,334 B2 · Supported catalyst particles

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- Number: US 12,214,334 B2
- Document ID: US12214334B2
- Status: Granted
- Kind: B2
- Application number: 17/435,007
- Filed: 2020-02-12
- Published: 2022-05-05
- Granted: 2025-02-04
- Earliest claimed: 2019-02-28
- Assignees: Cataler Corporation; Toyota Jidosha Kabushiki Kaisha
- Applicants: Cataler Corporation; Toyota Jidosha Kabushiki Kaisha
- Inventors: Hiroki Nihashi; Shogo Kawamura; Tomomasa Aikawa; Isao Naito; Shogo Shirakawa; Masahide Miura; Nobuyuki Takagi; Norimichi Shimano
- Web page: https://patentgrep.com/patent/US12214334B2

## CPC

- B01J 23/464: {Rhodium}
- B01D 53/9413: {Processes characterised by a specific catalyst}
- B01J 21/04: Alumina
- B01J 21/066: {Zirconium or hafnium; Oxides or hydroxides thereof}
- B01J 23/42: Platinum
- B01J 23/44: Palladium
- B01J 35/393: {Metal or metal oxide crystallite size}
- B01J 35/45: Nanoparticles
- B01J 37/0211: {using a colloidal suspension}
- B01J 37/04: Mixing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- B01D 2255/1025: Rhodium
- B01D 2255/9202: Linear dimensions
- B01D 2257/404: Nitrogen oxides other than dinitrogen oxide
- B01J 2235/30: Scanning electron microscopy; Transmission electron microscopy
- F01N 3/10: by thermal or catalytic conversion of noxious components of exhaust
- F01N 3/28: Construction of catalytic reactors
- 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)
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)

## Abstract

A supported catalyst particles include oxide carrier particles and noble metal particles supported on the oxide carrier particles, wherein the mass of the noble metal particles is less than or equal to 5 mass % based on the mass of the oxide carrier particles, and the average particle size of the noble metal particles measured by transmission electron microscopy is 1.0-2.0 nm, with the standard deviation σ less than or equal to 0.8 nm.

## Claims

### Claim 1

A supported catalyst particle, comprising
an oxide carrier particle and noble metal particles supported on the oxide carrier particle,
wherein a noble metal constituting the noble metal particles is rhodium,
the noble metal particles have a mass of 5% by mass or less based on the mass of the oxide carrier particle,
the noble metal particles have an average particle size of 1.0 nm to 2.0 nm with a particle size standard deviation σ of 0.8 nm or less, as measured by observation with a transmission electron microscope, and
a presence ratio of noble metal particles having a particle size of less than 1.0 nm is 5% by mass or less with respect to the total mass of the noble metal particles.

### Claim 2 (depends on 1)

The supported catalyst particle according to claim 1, wherein the noble metal particles have a particle size standard deviation σ of 0.6 nm or less.

### Claim 3 (depends on 1)

The supported catalyst particle according to claim 1, wherein the noble metal particles have an average particle size of 1.2 nm to 1.8 nm.

### Claim 4 (depends on 1)

The supported catalyst particle according to claim 1,
wherein the noble metal particles have a mass of 1.0% by mass or less based on the mass of the oxide carrier particle.

### Claim 5 (depends on 1)

The supported catalyst particle according to claim 1, wherein the oxide carrier particle is a particle of an oxide of one or more metals selected from titanium, zirconium, cerium, and aluminum.