초록

Selective reduction of NOx with NH3 as well as decomposition of excess NH3 is provided over a wide temperature range by a platinum-gold catalyst.

대표청구항 ▼

A process for reducing oxides of nitrogen while maintaining an effluent free of ammonia in a gas stream containing at least about 0.8 moles of ammonia for each mole of NOx present, at least 2 mole % of oxygen, comprising the step of passing the gas stream over a catalyst containing an amount of nobl

A process for reducing oxides of nitrogen while maintaining an effluent free of ammonia in a gas stream containing at least about 0.8 moles of ammonia for each mole of NOx present, at least 2 mole % of oxygen, comprising the step of passing the gas stream over a catalyst containing an amount of noble metal which is effective to catalyze the reduction of nitrogen oxides to nitrogen, wherein the noble metal consists essentially of from about 0.001 to about 5.0 percent platinum and from about 0.0005 to about 2.5 percent gold by weight of support and noble metal and the temperature of the gas stream is maintained within a range in which the noble metal catalyst is effective to decompose ammonia.