Nitrogen oxide removal

Forzatti, P., Lietti, L., and Tronconi, E., Nitrogen oxides removal, in Industrial Encyclopedia of Catalysis (I. T. Horvath New York, Wiley (2002). 

Most of the existing processes for nitrogen oxide removal are chemically based requiring high temperature or expensive catalysts. The main techniques involve either selective noncatalytic reduction (SNCR) or selective catalytic reduction (SCR). SNCR uses ammonia for conversion of NO to N2 and H20 at elevated temperatures (550-850 K). SCR can use catalysts such as Ti02 with active coatings of V2Os and WO, . 

There continue to be many absorbers for the removal of water-soluble gases. Acid gases and some volatile organic compounds can be absorbed readily in water by the types of equipment previously discussed. These processes are essentially absorption with chemical reaction. For a discussion of absorption in air pollution control and a description of several absorption systems for sulfur dioxide and nitrogen oxide removal, see Schnelle and Brown. A more detailed discussion of many more processes for flue gas desulfurization employing absorption is given by Lunt and Cunic. ... 

However, it can be stated that with a stoichiometric exhaust gas composition, the overall rate of carbon monoxide removal is one to two orders of magnitude higher than the overall rate of either hydrocarbon and nitrogen oxide removal. 

Activated carbon baghouse filter with Sorbalite for removal of mercury and other metals Ammonia injection system for nitrogen oxides removal and... 

Heidenreich S, Nacke M, Hackel M, and Schaub G. Catalytic filter elements for combined particle separation and nitrogen oxides removal from gas streams. Powder Technol. 2008 180 86-90. 

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