Method for the removal of nitrogen oxides from exhaust gases

Details Method for the removal of nitrogen oxides from exhaust gases Method for the removal of nitrogen oxides from exhaust gases

B - Operations, Transporting

01

D

23/353, 252/45

B01D 53/34 (2006.01) B01D 53/86 (2006.01)

Patent

CA 1078146

METHOD FOR THE REMOVAL OF NITROGEN OXIDES FROM EXHAUST GASES Abstract of the Disclosure The specification discloses a method for the removal of nitrogen oxides from exhaust gases which also contain sulfur oxides by a dry catalytic reduction process using a moving catalyst bed reactor wherein the exhaust gases are catalytically contacted with ammonia at 250 to 450°C. As the catalyst is removed from the reactor, treated to regenerate the catalytic activity and returned to the reactor, the temperature is main- tained at 100°C or higher and/or the concentration of steam in the surrounding atmosphere is maintained at 2 % by volume or lower. By this means, it is found that a decrease of the catalyst activity usually associated with the conventional processes can be effectively prevented.

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