B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
23/342, 252/88
B01J 23/38 (2006.01) B01D 53/94 (2006.01) B01J 23/42 (2006.01) B01J 23/46 (2006.01) B01J 23/63 (2006.01) B01J 35/00 (2006.01) B01J 37/02 (2006.01)
Patent
CA 2027329
ABSTRACT OF THE DISCLOSURE A catalyst composition has an upstream stage and a downstream stage, the upstream stage containing a catalytic material which is different from the catalytic material contained on the downstream stage and is characterized by having a low ignition temperature, e.g., 350°C to less than 400°C, for the substantially simultaneous conversion of HC, CO and NOx pollutants contained in, e.g., the exhaust of an automobile engine operating at a substantially stoichio- metric air-to-fuel weight ratio. The downstream catalytic material is characterized by having a higher conversion efficiency for substantially simultaneous conversion of HC, CO and NOx than the upstream catalytic material at elevated operation temperatures which may be, for example, from about 400 to 800°C. The method of the invention includes passing a gaseous exhaust stream containing HC, CO and NOx pollu- tants sequentially through first the upstream and then through the downstream catalytic materials.
Sim & Mcburney
The Engelhard Corporation
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