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(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21) APPLICATION No:
1301/MAS/1997A
(22) Date of filing of Application:16/06/1997 (43) Publication Date: 09/06/2006
(54) Title of the invention:
CATALYST ELEMENT FOR
PURIFYING EXHAUST GASES FROM
INTERNAL COMBUSTION ENGINE.
(51)International classification: B 01 D
53/94 , F 01 N 3/28 .
(31) Priority Document No.160271/1996
(32) Priority Date:20/06/1996
(33) Name of priority country: JAPAN .
(87) WIPO No. :
(61) Patent of addition to
Application No. :
Filed on:
(62) Divisional to
Application No.:
Filed on:
(71) Name of Applicant
HONDA GIKEN KOGYO KABUSHIKI
KAISHA , MITSUI KINZOKU KOGYO
KABUSHIKI KAISHA .
Address of Applicant:
1-1,2-CHOME,MINAMI-AOYAMA,
MINATO-KU, TOKYO,
1-1,2-CHOME,NIHONBASHI
MUROMACHI,CHUO-KU,TOKYO,
JAPAN.
(72) Name of the Inventor(s):
JUN FUJII.
TOSHIYA KUNISAKI.
MASAHARU NAKAMORI.
HIROSHI KATO.
(57) Abstract
In a catalyst element 3A for purifying exhaust gases having a metallic carrier 30 and a catalyst carrying layer
L3, an undercoat layer Ll is formed by coating the surface of the carrier 30 with a heat resistant inorganic oxide which
is superior in adhesion to a metal. The catalyst carrying layer L3 is then formed by carrying platinum (Pt) and
rhodium (Rh) on an alumina layer L2. The catalyst carrier layer L3 can thus be adhered in a close and better contact
with the carrier 30 via the undercoat layer LI. Even when the carrier 30 is subjected to thermal expansion and
vibrations, the amount of peeling of the platinum and rhodium off (or away from) the carrier 30 can be minimized.
Consequently, the decrease in the purifying characteristics can be minimized.
The Patent Office Journal 09/06/2006 10771