US 12,440,827 B2 · Catalyst for simultaneously inhibiting emission of ammonia and nitrous oxide

Abstract

An object of the present invention is to increase the reduction performance of nitrogen oxides compared to existing three-way catalysts; simultaneously inhibit the emission of ammonia and nitrous oxide; simplify a process by means of a method of further doping an iridium-ruthenium catalyst into a commercial three-way catalyst; and expand the scope of application. The present invention provides a catalyst for simultaneously inhibiting the emission of ammonia and nitrous oxide by doping an iridium-ruthenium catalyst component into a three-way catalyst (TWC), a diesel oxidation catalyst, or a lean NOx trap supported on a honeycomb support.

Claims6

Dependent claims

A catalyst for simultaneously inhibiting the emission of ammonia and nitrous oxide, comprising an iridium-ruthenium catalytic component doped onto a three-way catalyst (TWC) supported on a honeycomb substrate,

wherein the three-way catalyst comprises a support that includes a mixture of Al2O3 and at least one selected from a group consisting of SiO2, CeO2, CexZr1-xO2, Pr6O11, NiO, and BaO, wherein the value of x is in the range of 0<x<1, and
wherein the support, which comprises any one of Pt/Rh, Pd/Rh, or Pt/Pd/Rh, is doped with the iridium-ruthenium catalytic component.

Dependencies are inferred from the claim text.

Facts

Application

17/756,397Filed 25 Nov 2020

Priority

KR 10-2019-015473327 Nov 2019

Published

US 2023/0001387 A15 Jan 2023

Granted

14 Oct 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification34 codes

B01J 23/468
Ruthenium, rhodium, osmium or iridium: iridium
F01N 3/108
General auxiliary catalysts, e.g. upstream or downstream of the main catalyst: auxiliary reduction catalysts
B01D 53/9422
Processes characterised by a specific catalyst: for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich…
B01D 53/9427
Processes characterised by a specific catalyst: for removing nitrous oxide

Catalyst for simultaneously inhibiting emission of ammonia and nitrous oxide

Life of this patent

Catalyst for simultaneously inhibiting emission of ammonia and nitrous oxide

Life of this patent

Abstract

Claims6