B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 37/02 (2006.01) F01N 3/20 (2006.01)
Patent
CA 2079122
-15- Abstract of the Invention A three-way catalyst system for treating the exhaust stream of a compressed natural gas (CNG) fueled engine operating slightly rich of stoichiometry, the said catalyst system providing high conversions and low light-off temperature for the removal of HC, CO, and NOX. A high surface area gamma alumina support is impregnated with an intimate mixture of 0.2-30% Pd and 0.5-20% La2O3, the Pd being in crystalline form with a particle size in the range of 5-500 angstroms. A method of making such catalyst system comprising sequentially impregnating a high surface area gamma alumina support with lanthana and palladium by incipient wetness techniques, such techniques comprising the procedure of contacting alumina first with a lanthanum nitrate solution of desired concentration to obtain 0.5-20% lanthana, contacting the lanthana impregnated alumina with a palladium nitrate solution of desired concentration to obtain a 0.2-30% palladium content in the catalyst, each of said steps being separated by drying and calcination. A method of treating exhaust gas from a CNG fueled engine with the catalyst system described above, comprising: (a) operating said engine at slightly rich of stoichiometry; (b) exposing such catalyst to the exhaust gases in the range of 400-750°C and at a space velocity in the range of 0-100 K hr-1, said exhaust gas being converted at an efficiency greater than 90% for each of NO, CO, and CH4. 6181L
Chattha Mohinder S.
Subramanian Somasundaram
Watkins William L. H.
Ford Motor Company Of Canada Limited
Sim & Mcburney
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