公开(公告)号：EP1211395A4

公开(公告)日：2004-08-04

申请号：EP01943882

申请日：2001-06-29

申请人： ICT CO LTD ,  MITSUBISHI MOTORS CORP ,  INT CATALYST TECHNOLOGY INC

发明人： NAKAJIMA HIROYUKI ,  SUZAWA TAKUMI ,  SETO HIROKUNI ,  TASHIRO KEISUKE ,  NAKAYAMA OSAMU ,  TANIGUCHI SHIGEYOSHI ,  GOTOH HIDEKI

IPC分类号： B01D53/94 ,  B01J37/02 ,  F01N3/08 ,  F01N3/20 ,  F01N3/28 ,  B01J23/40

CPC分类号： B01D53/945 ,  B01D53/944 ,  B01J37/0244 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/20 ,  F01N3/2803 ,  F01N2510/06 ,  F01N2570/12 ,  Y02T10/22

摘要： A catalyst device for clarification of exhaust gas which is disposed in an exhausting route of an internal combustion engine capable of being operated at least at theoretical and lean air-fuel ratios, characterized in that it has a three component catalyst (4) comprising an inner layer (12a) containing primarily rhodium as a noble metal activating in a reduced oxygen content atmosphere and a surface layer (12b) containing primarily platinum or palladium as a noble metal activating in a enhanced oxygen content atmosphere. The catalyst device effectively removes HC due to activation of platinum or palladium in lean operation and, when O2 is temporarily short in the change from lean to stoichiometric air-fuel ratio, removes HC by supplementing O2 through utilizing the function of platinum or palladium to store O2, and as a result prevents the temporary great decrease of its ability to remove HC. Accordingly, the catalyst device secures the satisfactory performance of removing HC even in lean region without the increase of the amount of a noble metal in the three component catalyst.

公开(公告)号：EP0832688A4

公开(公告)日：1999-08-18

申请号：EP97916636

申请日：1997-04-09

申请人： ICT CO LTD ,  INT CATALYST TECHNOLOGY INC

发明人： OKUMURA AKIHISA ,  HORI MASAO ,  GOTOH HIDEKI ,  HORIUCHI MAKOTO

IPC分类号： B01D53/94 ,  B01J23/46 ,  B01J27/053 ,  B01J27/02

CPC分类号： B01D53/9418 ,  B01D2251/206 ,  B01D2255/102 ,  B01D2255/1028 ,  B01D2255/2042 ,  B01D2255/206 ,  B01D2255/2073 ,  B01D2255/20738 ,  B01D2255/20746 ,  B01D2255/20753 ,  B01D2255/407 ,  B01D2255/504 ,  B01J23/468 ,  B01J27/053 ,  Y02T10/24

摘要： An exhaust gas purifying catalyst comprises a substrate which carries thereon iridium as a catalyst activating substance, sulfur for improving a catalyst activity of iridium, and platinum as needed. Preferably, sulfur is contained in the form of sulfate radical. An exhaust gas purifying method comprises passing exhaust gases from an internal combustion engine through the exhaust gas purifying catalyst with an exhaust gas temperature at an inlet of the exhaust gas purifying catalyst being set to 200 to 700 DEG C. In purification of exhaust gases, the above constitution and method exhibit activity over a wide temperature range, in particular, with respect to removal of nitrogen oxides in an oxidizing atmosphere, and have heat resistance and durability to be excellent in serviceability.

摘要翻译： 废气净化催化剂包括其上承载有作为催化剂活化物质的铱，用于提高铱的催化剂活性的硫和根据需要的铂的衬底。 优选地，硫以硫酸根的形式被包含。 一种废气净化方法包括使来自内燃机的废气通过废气净化催化剂，废气净化催化剂入口处的废气温度设定为200-700℃。在废气净化中， 上述构造和方法在宽温度范围内展现出活性，特别是在氧化气氛中除去氮氧化物方面具有活性，并且具有耐用性和耐用性，以便于使用性。