US 2007/0191218 A1 · Oxidation catalyst for cleaning exhaust gas

Abstract

An oxidation catalyst for cleaning exhaust gas, excellent in the function of oxidizing high boiling point materials such as particulates and polycyclic aromatic hydrocarbons contained in the exhaust gas of internal-combustion engines is provided. The catalyst is a composite oxide containing two kinds of metal elements, wherein, when the two kinds of metal elements are defined as A and B, the value of the ionic radius of metal element A/the ionic radius of metal element B is in the range of from 1.349 to 1.580. The metal element A is selected from the group consisting of Sc, Y, Ho, Er, Tm, Yb, and Lu, and the metal element B is Mn. The composite oxide has a hexagonal structure.

Claims3

Dependent claims

An oxidation catalyst for cleaning exhaust gas comprising a composite oxide containing two kinds of metal elements and, when the two kinds of metal elements are defined as A and B, represented by the general formula of ABO3,

wherein the value of (the ionic radius of metal element A)/(the ionic radius of metal element B) is in the range of from 1.349 to 1.580.

Dependencies are inferred from the claim text.

Facts

Application

11/647,449Filed 29 Dec 2006

Priority

JP 2006-03679614 Feb 2006

Published

16 Aug 2007

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

B01J 23/002
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00: mixed oxides other than spinels, e.g. perovskite
B01D 53/945
Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]:…
B01J 23/10
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00: of rare earths
B01J 23/34
Manganese, technetium or rhenium: manganese

Oxidation catalyst for cleaning exhaust gas

Life of this patent

Oxidation catalyst for cleaning exhaust gas

Life of this patent

Abstract

Claims3