Catalyst and method of manufacture

摘要

Disclosed herein is a catalytic composition comprising a first catalyst composition portion that comprises a zeolite; and a second catalyst composition portion that comprises a catalytic metal disposed upon a porous inorganic substrate; the first catalyst composition portion and the second catalyst composition portion being in an intimate mixture.

主权项

1. A catalytic system for the conversion of nitrogen oxides in exhaust gases comprising an intimate mixture comprised of:
a first catalyst composition comprised of particles of a ferrierite that contains no metal ions and is not doped with a metal, and a second catalyst composition comprised of Ag on porous Al2O3 particles,wherein the ferrierite particles of the first catalyst composition are mixed with the particles of the second catalyst composition forming the intimate mixture in which the ferrierite particles are in contact with particles of the second catalyst composition in a weight ratio of ferrierite particles to second catalyst composition particles so that the catalyst system is capable of reducing the concentration of nitrogen oxide in the exhaust gases by between 15 weight percent to 90 weight percent at temperatures between 275° C. to 500° C.