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NO oxidation over Co-La catalysts and NO x reduction in compact SCR

  • Tiejun Zhang
  • Jian Li
  • Hong He
  • Qianqian Song
  • Quanming Liang
Research Article

Abstract

A series of Co-La catalysts were prepared using the wet impregnation method and the synthesis of catalysts were modified by controlling pH with the addition of ammonium hydroxide or oxalic solution. All the catalysts were systematically investigated for NO oxidation and SO2 resistance in a fixed bed reactor and were characterized by Brunanuer–Emmett–Teller (BET) method, Fourier Transform infrared spectroscopy (FTIR), X–ray diffraction (XRD), Thermogravimetric (TG) and Ion Chromatography (IC). Among the catalysts, the one synthesized at pH = 1 exhibited the maximum NO conversion of 43% at 180°C. The activity of the catalyst was significantly suppressed by the existence of SO2 (300 ppm) at 220°C. Deactivation may have been associated with the generation of cobalt sulfate, and the SO2 adsorption quantity of the catalyst might also have effected sulfur resistance. In the case of the compact selective catalytic reduction (SCR), the activity increased from 74% to 91% at the highest gas hourly space velocity (GHSV) of 300000 h–1 when the NO catalyst maintained the highest activity, in excess of 50% more than that of the standard SCR.

Keywords

NO catalytic oxidation pH effect Low temperature Sulfur dioxide High space velocity SCR 

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Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Tiejun Zhang
    • 1
  • Jian Li
    • 1
    • 2
  • Hong He
    • 1
    • 2
  • Qianqian Song
    • 1
  • Quanming Liang
    • 1
  1. 1.Key Laboratory of Beijing on Regional Air Pollution ControlBeijing University of TechnologyBeijingChina
  2. 2.Beijing Key Laboratory for Green Catalysis and SeparationBeijing University of TechnologyBeijingChina

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