Skip to Content
Find More Like This
Return to Search

Metal/metal oxide doped oxide catalysts having high deNOx selectivity for lean NOx exhaust aftertreatment systems

United States Patent

March 16, 2004
View the Complete Patent at the US Patent & Trademark Office
A lean NOx catalyst and method of preparing the same is disclosed. The lean NOx catalyst includes a ceramic substrate, an oxide support material, preferably .gamma.-alumina, deposited on the substrate and a metal promoter or dopant introduced into the oxide support material. The metal promoters or dopants are selected from the group consisting of indium, gallium, tin, silver, germanium, gold, nickel, cobalt, copper, iron, manganese, molybdenum, chromium, cerium, vanadium, oxides thereof, and combinations thereof. The .gamma.-alumina preferably has a pore volume of from about 0.5 to about 2.0 cc/g; a surface area of between about 80 to 350 m.sup.2 /g; an average pore size diameter of between about 3 to 30 nm; and an impurity level of less than or equal to 0.2 weight percent. In a preferred embodiment the .gamma.-alumina is prepared by a sol-gel method, with the metal doping of the .gamma.-alumina preferably accomplished using an incipient wetness impregnation technique.
Park; Paul W. (Peoria, IL)
Caterpillar Inc (Peoria, IL)
10/ 024,430
December 18, 2001
This invention was made with Government support under CRADA Number PNNL-157 between Caterpillar and Battelle as operator of Pacific Northwest national Laboratory under its U.S. Department of Energy contract. To that end, the United States Government may have certain rights to this invention.