Metallic supported catalytic system and a method of making it

Details Metallic supported catalytic system and a method of making it Metallic supported catalytic system and a method of making it

1979-03-26

1981-01-27

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252472, 252477R, 4232135, B01J 2104, B01J 2386

Patent

active

042474221

ABSTRACT:
A method of making and using a metallic supported catalytic system for automotive emission control is disclosed. A plain carbon steel foil is formed into a matrix having a plurality of aligned micropassages; forming is preferably carried out by corrugating one strip of foil and winding said corrugated strip along with one or more noncorrugated foil strips to create a honeycomb matrix. The formed matrix is then immersed in a hot lead bath containing alloying ingredients which displace iron atoms in said foil to provide diffusion alloying substantially throughout the entire thickness of said foil. The contact points between said foil strips are diffusion bonded to lock the entire matrix. The alloyed matrix is then heated to form an oxide film from at least one of the alloying ingredients. The bonded matrix is then coated with a refractory wash and with a catalytic ingredient. The entire coated and heat treated matrix is then placed in a suitable housing through which hot automotive emissions are directed with a predetermined pressure, flow pattern and chemical content for effecting fusion of the coatings and emission cleanup.

REFERENCES:
patent: 3397154 (1968-08-01), Talsma
patent: 3907708 (1975-09-01), Lacroix
patent: 3920583 (1975-11-01), Pugh
patent: 4096095 (1978-06-01), Cairns

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