Metallic core member for catalytic converter and catalytic converter containing same

• US 4,928,485 A
• Filed: 06/06/1989
• Issued: 05/29/1990
• Est. Priority Date: 06/06/1989
• Status: Expired due to Fees

• Current Assignee: Engelhard Corporation (BASF SE)
• Original Assignee: W R Grace & Company - CONN (WR Grace & Company)
• Inventors: Whittenberger, William A.
• Primary Examiner(s): Hart, Douglas
• Application Number:
  US07/362,089
• Time in Patent Office: 357 Days
• Field of Search: 60/299, 60/300, 422/180, 502/527
• US Class Current: 60/299
• CPC Class Codes: F01N 13/009 having two or more separate purifying devices arranged in series
• CPC Class Codes: F01N 2330/04 Methods of manufacturing
• CPC Class Codes: F01N 2350/02 Fitting ceramic monoliths in a metallic housing
• CPC Class Codes: F01N 2510/00 Surface coverings
• CPC Class Codes: F01N 2530/04 Steel alloys, e.g. stainless steel
• CPC Class Codes: F01N 3/2026 directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
• CPC Class Codes: F01N 3/2814 all sheets, plates or foils being corrugated
• CPC Class Codes: F01N 3/2853 using mats or gaskets between catalyst body and housing
• CPC Class Codes: F01N 3/2857 the mats or gaskets being at least partially made of intumescent material, e.g. unexpanded vermiculite
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

There is provided a novel core member for use in a catalytic converter characterized by a corrugated nonnesting thin metal foil having a given length and a given width, which strip is overfolded to provide portions of about equal length. Along the fold line is attached a wire or rod, as, for example, by welding. The wire containing ends are gathered and secured to form a central core. This core may by spirally wound to fit within a peripheral housing, and the free ends of the core members secured to the housing, as by welding. This assembly may be used in a catalytic converter and may be equipped to be electrically heated from a battery using the resistance of the corrugated thin metal strip portions to effect heating thereof.

Claims

1. A core member useful in a catalytic converter comprising:

(a) a strip of corrugated nonnesting thin metal foil having a given length and a given width, said strip being folded to provide portions of about equal length; and

(b) a wire secured along the fold line of said folded strip.

2. A core member in accordance with claim 1 wherein the wire has a length greater than the width of the thin metal foil.

3. A core member in accordance with claim 1 wherein the thin metal foil is corrugated in a herringbone or chevron pattern.

4. A core member in accordance with claim 1 wherein the metal is a stainless steel.

5. A core member in accordance with claim 1 wherein the corrugated thin metal foil is provided with a wash coat of at least one refractory metal oxide.

6. A core member in accordance with claim 5 wherein the refractory metal oxide coating has a catalyst deposited thereon.

7. A core member in accordance with claim 6 wherein the catalyst comprises a noble metal.

8. A core member in accordance with claim 6 wherein the noble metal is selected from the group consisting of palladium, platinum, rhodium, ruthenium and mixtures thereof.

9. A polycellular catalytic module for a catalytic converter comprising a plurality of core members as defined in claim 1, said core members being collected at their wire-containing ends;

means for binding the ends of the wires to form a central core;

a peripheral housing for compacting and retaining said core members; and

means for securing the free ends of said core members to said peripheral housing.

10. A polycellular catalytic module as defined in claim 9 having a gas intercepting face and wherein the cell density at the gas intercepting face is from 50 to 700 cells per square inch.

11. A polycellular catalytic module as defined in claim 9 wherein the wires project from each side of the thin metal foil, and the means for binding the projecting ends of the wires is a metal ring.

12. A polycellular catalytic module as defined in claim 9 wherein the housing is a circular metallic member.

13. A polycellular catalytic module as defined in claim 9 wherein the means for securing each of the free ends of the core members to the housing is a tab formed at each of the free ends of the core members and said tab is welded to the housing.

14. A polycellular catalytic module as defined in claim 9 wherein the housing is a circular member, the distance from the central core to the inner surface of the housing is less than the lengths of the thin metal portions, and the core members are spirally wound about the central core.

15. A polycellular catalytic module as defined in claim 9 wherein the housing is oval and the distances from the central core to the inside of the peripheral housing are less than the lengths of the thin metal portions.

16. An electrically heatable polycellular catalytic module in accordance with claim 9 wherein one pole of a voltage source is connected to the central core, and the other pole of a voltage source is connected to the housing.