Catalyst for purifying exhaust gases
AssigneeCataler Corporation
InventorsKoichi Kasahara, Yasunori Sato, Kenichi Taki
Life of this patent
Estimating the term…
Abstract
A catalyst for purifying exhaust gases exhibits not only effective purifying characteristics even in a low temperature range such as immediately after an engine starts but also high exhaust gas purifying ability. In the catalyst for purifying exhaust gases of a first aspect of the invention, HC adsorbed at low temperature are released at high temperature and the released HC are purified by a catalyst metal. This catalyst for purifying exhaust gases has an excellent advantage in purifying HC at low temperature as well as excellent exhaust gas purifying ability.
Claims6
A catalyst for purifying exhaust gases, comprising:
- a catalyst support having tubular passages through which exhaust gases flow in an axial direction;
- a coating layer formed on a surface of the catalyst support and composed of zeolite, refractory inorganic oxide, and a first catalyst metal loaded on a surface of the refractory inorganic oxide;
- and
- a second catalyst metal loaded on a front stage part of the coating layer, which is an upstream end of the exhaust gas flow, and/or a rear stage part of the coating layer, which is a downstream end of the exhaust gas flow.
Dependencies are inferred from the claim text.