Journal
CHEMICAL ENGINEERING JOURNAL
Volume 240, Issue -, Pages 62-73Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.11.053
Keywords
Zirconium-based composite oxide; Ammonia; Selective catalytic reduction; Nitrogen oxides
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Funding
- National Natural Science Foundation of China [21173153]
- National High-Tech Research and Development (863) Program of China [2013AA065304]
- Project from Sichuan Provincial Environment Office of China [2011HB002]
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A series of monolithic acidic zirconium-based composite oxide catalyst (Ce-ZrTiSiWOx) were prepared by different introduction methods and loading contents of CeO2 for selective catalytic reduction (SCR) of NO, with ammonia. In this work, a acidic zirconium-based composite oxide (10 wt.% CeO2/ZrTiSiWOx) catalyst prepared only by impregnation method presented good NH3-SCR activity and high N-2 selectivity in a broad operation temperature window, comparative strong tolerance of gas hourly space velocities (GHSV), water, sulfur and hydrothermal aging. Compared with V2O5/TiSiWOx and Fe-ZSM-5 catalysts, the CeO2/ZrTiSiWOx catalyst showed a better NH3-SCR performance and higher thermal aged performance. More than 80% NOx could be removed in the temperature range of 277-545 degrees C under GHSV of 30,000 h(-1) over the monolithic 10 wt.% CeO2/ZrTiSiWOx catalyst. More surface atomic concentration of Ce, strong reducible ability and the maximum acid amount are important reasons for the high NH3-SCR activity of the CeO2/ZrTiSiWOx catalyst. (C) 2013 Elsevier B.V. All rights reserved.
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