METHOD AND CATALYST FOR THE SIMULTANEOUS REMOVAL OF CARBON MONOXIDE AND NITROGEN OXIDES FROM FLUE OR EXHAUST GAS

摘要

A method and a catalyst, where flue gas or exhaust gas containing harmful carbon monoxide, organic compounds (VOC) and NOx is contacted with a layered catalyst in which a first layer comprises an oxidation catalyst and in an underlying layer a NH3-SCR catalyst for the simultaneous removal of the carbon monoxide and NOx.

主权项

1. Method for the reduction of amounts carbon monoxide, volatile organic compounds and nitrogen oxides in flue or exhaust gas comprising the steps of:
introducing ammonia and/or a precursor thereof into the flue or exhaust gas; converting the precursor if any into ammonia; contacting the gas and the ammonia at a temperature of up to 350° C. with a layered catalyst comprising an upper first catalyst layer with an oxidation catalyst and an underlying second catalyst layer with an NH3-SCR catalyst supporting completely the first layer and oxidizing at least part of the amounts of carbon monoxide and the volatile organic compounds in the upper first layer without affecting the ammonia further contained in the gas and reducing the amounts of nitrogen oxides in the underlying second catalyst layer by reaction with the ammonia.