Hexagonal-cell honeycomb catalyzer for purifying exhaust gas

Details Hexagonal-cell honeycomb catalyzer for purifying exhaust gas Hexagonal-cell honeycomb catalyzer for purifying exhaust gas

2011-08-02

2011-08-02

Bhat, N. (Department: 1771)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

C422S177000, C422S182000, C422S183000, C060S300000, C060S301000

Reexamination Certificate

active

07988921

ABSTRACT:
A hexagonal-cell honeycomb catalyzer is for purifying an exhaust gas. The catalyzer comprising a support that has a plurality of cells and a purification layer that has an HC absorption layer and a three-way catalyst layer. The HC absorption layer is formed on the honeycomb-formed surface of each wall of the support. The three-way catalyst layer is formed on the surface of the HC absorption layer. Provided that the HC absorption layer has a thickness a1and the three-way catalyst layer has a thickness b1at a thin portion of the purification layer of which thickness is minimum and the HC absorption layer has a thickness a2and the three-way catalyst layer has a thickness b2at a thick portion of the purification layer of which thickness is maximum, a ratio of a1/b1and a ratio of a2/b2are both within a range of 1/20 to 5/1.

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