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Content archived on 2024-04-15

SELECTIVE CATALYTIC REDUCTION OF NOX.

Objective



THE SELECTIVE CATALYTIC REDUCTION OF NO USING NH3 (SCR), A TECHNIQUE FOR REDUCING NOX EMISSIONS FROM STATIONARY SOURCES WAS DEVELOPED MAINLY IN JAPAN AND IS NOW EMPLOYED IN VARIOUS EUROPEAN COUNTRIES.
IN ADDITION TO FUNDAMENTAL RESEARCH INTO THE REACTION MECHANISM OF THE REDUCTION NH3 + NO -> N2 + H2O, RESEARCH INTO THE APPLICATION OF SCR TO EUROPEAN CONDITIONS IS ALSO REQUIRED. BY FAR THE MOST IMPORTANT CONSIDERATION, HOWEVER, IS THE FINANCIAL ASPECT: 50 TO 70% OF THE COST - 0,5 TO 1,2 CT/KWH - IS DUE TO THE CATALYST. A MODIFIED PROCESS USING LESS AND/OR CHEAPER MATERIAL MAY YIELD SIGNIFICANT COST REDUCTIONS.

A POSSIBLE WAY OF ACHIEVING THIS IS TO USE EQUIMOLAR NO/NO2 REDUCTION. ECN'S RESEARCH HAS SHOWN THAT EQUIMOLAR REDUCTION IS SIGNIFICANTLY FASTER THAN NO REDUCTION. THE RESULTS OF THIS RESEARCH AND A CRITICAL REVIEW OF THE LITERATURE ARE BEING PUBLISHED. IN ORDER TO EVALUATE THE POTENTIAL APPLICATIONS OF EQUIMOLAR NOX REDUCTION, HOWEVER, MORE DETAILED KNOWLEDGE IS REQUIRED CONCERNING :

1. THE SPEED OF THE EQUIMOLAR REACTION UNDER DIFFERENT FLUE GAS CONDITIONS;
2. THE INFLUENCE OF DIFFERENT CATALYST MATERIALS;
3. FLUE GAS MODIFICATION PROCESSES TO OBTAIN THE EQUIMOLAR MIXTURE NO / NO2.

THE PROPOSED EXPERIMENTAL RESEARCH WILL FOCUS ON POINTS 1 AND 2. A STUDY WILL BE CARRIED OUT INTO POINT 3 TO ASSESS POSSIBILITIES TO OBTAIN THE REQUIRED NO / NO2 RATIO OF ONE.

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ENERGY RESEARCH CENTRE OF THE NETHERLANDS
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