Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 31, Issue -, Pages 240-247Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2014.07.037
Keywords
Water effect; MnOx-NbOx-CeO2 catalysts; Acid sites; Fast SCR reaction; NO/NO2 ratio
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Funding
- Ministry of Science and Technology of China [2010CB732304]
- Science and Technology Department of Zhejiang Province Project [2011C31010]
- National Natural Science Foundation of China [51202126]
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A MnOx-NbOx-CeO2 catalyst for low temperature selective catalytic reduction (SCR) of NOx with NH3 was prepared by a sol-gel method, and characterized by NH3-NO/NO2 SCR catalytic activity, NO/NH3 oxidation activity, NOx/NH3 TPD, XRD, BET, H-2-TPR and in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The results indicate that the MnOx-NbOx-CeO2 catalyst shows excellent low temperature NH3-SCR activity in the temperature range of 150-300 degrees C. Water vapor inhibits the low temperature activity of the catalyst in standard SCR due to the inhibition of NOx adsorption. As the NO2 content increases in the feed, water vapor does not affect the activity in NO2 SCR. Meanwhile, water vapor significantly enhances the N-2 selectivity of the fresh and the aged catalysts due to its inhibition of the decomposition of NH4NO3 into N2O. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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