CATALYST FOR PURIFYING EXHAUST GAS, PROCESS FOR PRODUCING THE SAME, AND METHOD FOR PURIFYING EXHAUST GAS

WIPO Patent Application WO/1999/033560

A1

An exhaust gas purifying catalyst comprising a carrier containing rutile titania, an NOx occluding material supported on a carrier comprising at least one member selected among alkali metal, alkaline earth metal and rare earth elements, and a noble metal supported on the carrier. Since the rutile TiO2 and the NOx occluding material form a finely divided composite oxide, a catalyst poison is liable to be decomposed even when the NOx occluding material is poisoned by sulfur, and thus this material can readily recover the capability of occluding NOx. Therefore it is possible to inhibit the sulfur poisoning of the NOx occluding material and to maintain a high NOx purifying rate even after high-temperature application.

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HASEGAWA YORIKO (JP)
KIMURA MAREO (JP)
TAKAHASHI NAOKI (JP)
SUZUKI HIROMASA (JP)
MURAMOTO RIEMI (JP)
SOBUE KAZUAKI (JP)

PCT/JP1998/005791

July 08, 1999

December 22, 1998

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TOYOTA MOTOR CO LTD (JP)
TOYODA CHUO KENKYUSHO KK (JP)
HASEGAWA YORIKO (JP)
KIMURA MAREO (JP)
TAKAHASHI NAOKI (JP)
SUZUKI HIROMASA (JP)
MURAMOTO RIEMI (JP)
SOBUE KAZUAKI (JP)

B01D53/94; B01J21/06; B01J23/00; B01J23/58; B01J23/63; F01N3/08; (IPC1-7): B01J23/56; B01D53/94; B01J23/58; F02D41/04

JPS62256757A	1987-11-09
JPS57127444A	1982-08-07
JPH07256105A	1995-10-09
JPH0985053A	1997-03-31
JPH08192051A	1996-07-30
JPH10211431A	1998-08-11

See also references of EP 1064998A4

Ohkawa, Hiroshi (Nakamura-ku Nagoya-shi, Aichi-ken, JP)

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