Patent Number: 6,254,842

Title: Method for using a close coupled catalyst

Abstract: A stable, close-coupled catalyst, an article comprising the close-coupled catalyst and a related method of operation. The close-coupled catalyst comprises a catalyst support and a palladium catalytic component. Preferably and optionally, there are stabilizers including alkaline metal oxide, and rare earth metal components selected from the neodymium and lanthanum components. The close-coupled catalyst composition includes substantially no additional oxygen storage component such as praseodymium or cerium compounds. There is preferably a catalyst such as a three-way catalyst downstream of the close-coupled catalyst. The downstream catalyst preferably includes an oxygen storage component such as cerium oxide or praseodymium oxide.

Inventors: Hu; Zhicheng (Edison, NJ), Heck; Ronald M. (Frenchtown, NJ), Rabinowitz; Harold N. (Upper Montclair, NJ)

Assignee: Engelhard Corporation

International Classification: B01J 23/58 (20060101); B01D 53/94 (20060101); B01J 23/54 (20060101); F02B 1/00 (20060101); F02B 1/04 (20060101); B01J 008/02 (); C01B 021/00 (); C01B 023/00 (); F01N 003/10 ()

Expiration Date: 07/03/2018