| 摘要 |
A method for purifying combustion exhaust gases provides for conducting the combustion operation, e.g., running a natural gas-fueled internal combustion engine, sufficiently rich of the stoichiometric air-to-fuel ratio to provide reducing values (carbon monoxide and hydrogen) in at least the stoichiometric quantity needed to reduce nitrogen oxides: the ratio air: fuel (as used) to air: fuel (stoichiometric) is in the range 0.89 to 1.0. The exhaust gas is contacted with a platinum group metal (platinum and rhodium) catalyst to effectuate reduction of NOx formed in the combustion or otherwise contained in the exhaust gas, to nitrogen and oxidation of carbon monoxide.
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