Effect of gas composition on the selective reduction of NOx with ammonia over Vanadia based catalysts

Authors : Souad Djerad, Marcus CROCOLL, Lakhdar TİFOUTİ, Werner WEİSWEİLER

Pages : 3-12

View : 15 | Download : 10

Publication Date : 2018-04-01

Article Type : Research Paper

Abstract :The catalytic reduction of NO x under different oxygen concentrations leading to different NO/NO 2 compositions has been studied in the presence of V3W9Ti and V8W9Ti catalysts in a tubular flow reactor. The results have shown that increasing O 2 concentration leads to increase the NO x reduction in low temperature range [150-275 °C]. Slight effect of O 2 concentration on NO x conversion was observed at higher temperatures. SCR reaction also occurred in the absence of gaseous oxygen but with low NO conversion indicating the strong redox properties of both catalysts. Aged catalysts exhibited relative good activities in NO x reduction. This is probably due to the sol gel method used for the preparation of the catalysts known to improve the catalysts properties.
Keywords : SCR, Oxygen concentration, NO NO2 mixture, Ammonia oxidation, TPD, Aging