Metal substrate having an insulating barrier

Details Metal substrate having an insulating barrier Metal substrate having an insulating barrier

1992-10-02

1994-02-22

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

60300, 422174, 502332, 502333, 502334, B01D 5334, B01J 2340, B01J 2356, F01N 310

Patent

active

052884708

ABSTRACT:
A metal substrate contains a barrier which functions as an electrical insulator. One can thus use the substrate to make an electrically heated catalytic converter, in which one must electrically isolate a catalyst-bearing strip from adjacent strips. One forms the substrate by first coating the substrate with a thin first layer of alumina washcoat and heating the substrate to a temperature of about 800.degree. to 1000.degree. C. This heating step produces the barrier, which may constitute a spinel. One can then apply a catalyst to the substrate, either by applying one or more secondary layer(s) of washcoat, having greater thickness than the first layer, and impregnating the second layer with the catalyst, or by coating the substrate with a washcoat which already contains the catalyst. Alternatively, one can omit the step of applying the catalyst, and can use the strips to form a heater for a stream of gas. One can use the heater in conjunction with a main catalytic heater, or as a stand-alone heater.

REFERENCES:
patent: 4601999 (1986-07-01), Retallick et al.
patent: 4762567 (1988-08-01), Retallick
patent: 4928485 (1990-05-01), Whittenberger
patent: 4976929 (1990-12-01), Cornelison et al.
patent: 5070694 (1991-12-01), Whittenberger
patent: 5118475 (1992-06-01), Cornelison
patent: 5141912 (1992-08-01), Ernest et al.

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