Mini-cascade catalyst system

Details Mini-cascade catalyst system Mini-cascade catalyst system

1996-01-16

1998-12-08

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232137, 422171, 422180, B01D 5394

Patent

active

058465022

ABSTRACT:
A catalyst system for converting hydrocarbons, carbon monoxide and nitrogen oxides contained in exhaust gas generated by an internal combustion engine. The catalyst system comprises: first, second, and third catalyst bricks arranged in series in an exhaust gas passage of an internal combustion engine downstream of an exhaust gas manifold. The first brick has the smallest volume and is closely coupled to an exhaust gas manifold of the engine and the first catalyst brick is positioned adjacent to and spaced apart from the second catalyst brick by a predetermined distance of no more than 10 inches. Each catalyst brick individually comprises a substrate material coated with a metallic catalyst carried on a porous support, wherein the metallic catalyst provided on the first brick comprises palladium.

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Ball, D.J., et al. "Warm-up and Underfloor Converter Parametric Study", SAE Paper 932765 (1993), pp. 179-189.
Paul. M. Laing, "Development of an Alternator-Powered Electrically-Heated Catalyst System", (SAE Paper 941042). (1994).

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