Method for purifying exhaust gases

Details Method for purifying exhaust gases Method for purifying exhaust gases

1995-10-23

1998-09-08

Lewis, Michael

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232391, B01D 5394

Patent

active

058041524

ABSTRACT:
An automotive exhaust catalyst includes a support, which is less likely to adsorb SO.sub.x contained in exhaust gases thereon, an NO.sub.x storage compound loaded on the support, and a noble metal element loaded on the support. The support is an alumina support with a Ti--Zr composite oxide loaded thereon, or is formed of a Ti--Zr or Ti--Zr--Y composite oxide. The composite oxide inhibits the NO.sub.x storage compound, which is selected from alkali metals, alkaline-earth metals and rare-earth elements, from being poisoned by sulfur, and enhances the thermal resistance of the support. Thus, the automotive exhaust catalyst can effectively purify NO.sub.x contained in lean-side exhaust gases, even after it is subjected to a thermal durability test.

REFERENCES:
patent: 5075276 (1991-12-01), Ozawa et al.
patent: 5294421 (1994-03-01), Muraki et al.
patent: 5388406 (1995-02-01), Takeshima et al.
patent: 5412945 (1995-05-01), Katoh et al.

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