CATALYTIC TREATMENT OF EXHAUST GASES

摘要

Nitrogen oxides are removed from a waste gas by reaction with carbon monoxide in the presence of a wire mesh selected from copper-containing alloys. Where the exhaust gas contains lead species or other impurities which tend to poison the catalyst, the exhaust gas contacts a molten alkali metal carbonate mixture which removes the lead species prior to the gas contacting the catalyst. Other poisonous impurities such as sulfur dioxide are also removed by the carbonate mixture.