caa a22 4500 606173544 CHVBK 20210128100733.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11244-015-0469-7 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0469-7 Activity Enhancement of W-CeZr Oxide Catalysts by SO2 Treatment in NH3-SCR [Elektronische Daten] [Ari Väliheikki, Tanja Kolli, Mika Huuhtanen, Teuvo Maunula, Riitta Keiski] The impact of sulphur and hydrothermal aging on W-CeZr and CeZr catalysts was investigated. Sulphur treatments for W-CeZr and CeZr were done in the absence and presence of water (S- and S+H2O-treatments, respectively) for 5h at 400°C. Similarly, hydrothermal aging (H2O-treatment) for W-CeZr and CeZr catalysts was done in a gas phase. The W and S contents were analyzed using XRF. The studied catalysts were characterized by BET, BJH, DRIFTS, XPS and NH3 desorption methods. In addition, the activity of the catalysts was tested in NH3-SCR reaction. The NOx conversion over the fresh W-CeZr catalyst was 85% at 350°C whereas the fresh CeZr was not active in NOx reduction. In the case of W-CeZr and CeZr catalysts, S+H2O and S-treatments increased the NOx conversion up to 92-98% at the temperature range of 350-400°C. The increased portion of chemisorbed oxygen due to S- and S+H2O-treatments enhances the NOx reduction reactions. The water treatment had no effect on the NH3-SCR activity which indicates that the S-compounds are the major reason for enhanced activity. Springer Science+Business Media New York, 2015 Sulphur dioxide nationallicence Ceria-zirconia nationallicence Tungsten nationallicence Nitrogen oxides nationallicence NH3-SCR nationallicence Väliheikki Ari Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland aut Kolli Tanja Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland aut Huuhtanen Mika Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland aut Maunula Teuvo Dinex Ecocat Oy, Typpitie 1, 90620, Oulu, Finland aut Keiski Riitta Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 1002-1011 1022-5528 58:14-17<1002 2015 58 11244 https://doi.org/10.1007/s11244-015-0469-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0469-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Väliheikki Ari Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland aut NATIONALLICENCE 700 1- Kolli Tanja Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland aut NATIONALLICENCE 700 1- Huuhtanen Mika Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland aut NATIONALLICENCE 700 1- Maunula Teuvo Dinex Ecocat Oy, Typpitie 1, 90620, Oulu, Finland aut NATIONALLICENCE 700 1- Keiski Riitta Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 1002-1011 1022-5528 58:14-17<1002 2015 58 11244