US EPA

1751869 

Technical Report 

Selective catalytic reduction of NO/NO2 with NH3 

Tuenter, G; Muller, HGP; Snepvangers, LJM 

1991 

NTIS/02977329_a 

GRA and I 

GRA and I 

It has been demonstrated that on a commercial grade deNO(sub x) catalyst, the equimolar reduction of NO(sub x) is much faster than in the cases of either pure NO or pure NO(sub 2). NO however, being the predominant NO(sub x) component in flue gases, must be partly oxidized to NO(sub 2) prior to entering the catalytic reactor. The aim of the project is to evaluate the perspective of a modified selective catalytic process to reduce NO(sub x) emissions from flue gas. The modified process is based on the equimolar NO/NO(sub 2) reduction, including a partial oxidation of NO. The experimental program of the project is concerned with the determination of the rate of equimolar reduction on different catalysts and under conditions relevant for large scale applications. It is concluded from this project that the rate of reduction of an equimolar NO/NO(sub 2) gas mixture is higher than the reduction of NO which in term is higher than the reduction rate of NO(sub 2). However, attaining an equimolar composition in the flue gas is, for the modification processes considered, hardly feasible, if economical aspects are taken into consideration. Development of cheap processes for flue gas composition modification with respect to the NO(sub 2) content like catalytic oxidation of NO is concluded to be an essential step to arrive at a commercially attractive modification of the SCR process. A description of the experimental program along with the results and the final conclusions is given. 8 figs., 7 tabs. (ERA citation 16:019957) 

Flue Gas; *Nitric Oxide; *Nitrogen Dioxide; *Ammonia; *Catalytic Effects; Titanium Oxides; Tungsten; Vanadium Oxides; Catalysts; Commercialization; Denitrification; Reaction Kinetics; Reducing Agents; Reduction; Foreign technology; *Air pollution control; EDB/200202; EDB/400201; EDB/010800; EDB/540120