초록 ▼

There is provided a process and apparatus for carrying out the process, to remove nitrogen oxides from a gas stream. The process is characterized by passing the gas stream through a first catalytic zone in the absence of added ammonia and in the presence of an oxidation catalyst to convert the NO co

There is provided a process and apparatus for carrying out the process, to remove nitrogen oxides from a gas stream. The process is characterized by passing the gas stream through a first catalytic zone in the absence of added ammonia and in the presence of an oxidation catalyst to convert the NO content thereof to NO2, thereafter introducing ammonia into the gas stream, and catalytically reducing the NO2 to nitrogen and water in the presence of a catalyst. Higher conversion to innocuous materials is obtained.

대표청구항 ▼

A process for removing nitrogen oxides, including NO and NO2, from a gas stream containing free oxygen and converting them to nitrogen and water which comprises the steps of contacting said gas stream with an oxidation catalyst in a first zone in the substantial absence of added ammonia under reacti

A process for removing nitrogen oxides, including NO and NO2, from a gas stream containing free oxygen and converting them to nitrogen and water which comprises the steps of contacting said gas stream with an oxidation catalyst in a first zone in the substantial absence of added ammonia under reaction conditions effective to substantially convert the NO present in said gas stream to NO2, and thereafter contacting the gas stream from said first zone with a reduction catalyst in a second zone under reaction conditions effective to reduce the NO2 present in said gas stream to nitrogen and water.