US 7,842,642 B2 · Catalyst carrier and catalyst using the same

Abstract

The catalyst carrier in accordance with the present invention is a catalyst carrier comprising a support containing an oxide and an element in group 3A of the periodic table, and a coating part covering at least a part of a surface of the support; wherein the coating part contains an element in group 3A of the periodic table; and wherein the element in group 3A contained in the coating part has a concentration higher than that of the element in group 3A contained in the support. In this case, even when a catalyst in which rhodium is supported by the catalyst carrier is used for a long time in a high temperature environment, the grain growth of rhodium particles can be suppressed, and the catalyst can fully be prevented from lowering its activity.

Claims12

Dependent claims

A catalyst comprising:

a catalyst carrier, said catalyst carrier comprising a crystal particle containing an oxide and an element in group 3A of the periodic table, and a coating part covering an upper surface of the crystal particle;
and
a catalytic material;
wherein the coating part contains an element in group 3A of the periodic table;
wherein the element in group 3A contained in the coating part has a concentration higher than that of the element in group 3A contained in the crystal particle;
wherein the catalytic material is in contact with an upper exterior surface of the coating part;
and
wherein the crystal particle contains a zirconium oxide and a lanthanum oxide.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/632,945Filed 22 Jul 2005

Priority

JP P2004-21493022 Jul 2004

Published

US 2008/0090722 A117 Apr 2008

Granted

30 Nov 2010

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

B01D 53/945
Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]:…
B01J 21/066
Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof: zirconium or hafnium; Oxides or hydroxides thereof
B01J 23/63
Platinum group metals: with rare earths or actinides
B01J 35/19
Catalysts, in general, characterised by their form or physical properties: catalysts containing parts with different compositions

Catalyst carrier and catalyst using the same

Life of this patent

Catalyst carrier and catalyst using the same

Life of this patent

Abstract

Claims12