Catalytic converter

Details Catalytic converter Catalytic converter

1996-12-20

1999-03-30

Tran, Hien

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422171, 422177, 422180, 422199, 60300, 55DIG30, F01N 310

Patent

active

058884564

ABSTRACT:
A catalytic converter includes a housing, a honeycomb heater fixed to inside the housing, and a catalytic element disposed downstream of the honeycomb heater. The honeycomb heater has a first honeycomb structure made of metal having a first partition wall having a plurality of first throughholes, and at least one electrode for electrifying the first honeycomb structure. The catalytic element fixed to inside the housing and disposed downstream of the honeycomb heater has a second honeycomb structure having a second partition wall having a plurality of second throughholes, and a catalytic compound loaded on the second honeycomb structure. A horizontal cross-section of the honeycomb structure is made smaller than that of the honeycomb structure. Further, a gap between an outflow end surface of the honeycomb structure and an inflow end surface of the honeycomb structure is made large. According to the catalytic converter, a durability of a honeycomb structure, particularly resistance against vibrations extending over a long period of time can be improved while maintaining an exhaust gas purification ability under severe driving conditions. Further, according to the present invention, the temperature of a honeycomb heater can be raised in a short period of time.

REFERENCES:
patent: 3768982 (1973-10-01), Kitzner et al.
patent: 5063029 (1991-11-01), Mizuno et al.
patent: 5202548 (1993-04-01), Kondo et al.
patent: 5264186 (1993-11-01), Harada et al.
patent: 5323607 (1994-06-01), Tanaka et al.
patent: 5614155 (1997-03-01), Abe et al.
SAE Technical Paper Series, "A Structurally Durable EHC for the Exhaust Manifold" by Mizuno et al.
Patent Abstracts of Japan--vol. 17, No. 186 (M-1395), Apr. 12, 1993 & JP 04 339122 A (NGK Spark Plug Co), Nov. 26, 1992--abstract.

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