ABSTRACT
The aim of the project is to evaluate the perspective of a modified selective catalytic reduction process to reduce NOx emissions from flue gas. In a previous study the activity of the equimolar NO/NO2 reduction was found to be higher then the NO reduction. The modified process is based on the equimolar NO/NO2 reduction. NO being the predominant NOx component in flue gas from stationary sources, must then be partly oxidized to NO2. A desk study is carried out to review the literature on methods for flue gas composition modification with respect to the NO/NO2 ratio. The evaluation of the modified SCR process also requires more knowledge about the increase in catalytic activity of the equimolar NO/NO2 reduction as compared to the NO reduction and about the effect of catalyst composition on the reaction rate. In order to investigate these aspects, an experimental programme is carried out, using four different catalyst materials; two commercial preparations and two self-prepared vanadium-titaniumdioxide catalysts. The results of activity measurements for NO, NO2 and the equimolar NO/NO2 reduction are reported, under conditions relevant for large scale applications. From these results some preliminary conclusions can be drawn with respect to the perspective of the modified process.
