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Citation: DONG Guo-jun, ZHANG Yu-feng, ZHAO Yuan, BAI Yang. Effect of the pH value of precursor solution on the catalytic performance of V2O5-WO3/TiO2 in the low temperature NH3-SCR of NOx[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(12): 1455-1463. shu

Effect of the pH value of precursor solution on the catalytic performance of V2O5-WO3/TiO2 in the low temperature NH3-SCR of NOx

  • 1.

    College of Materials Science and Chemical Engineering, Key laboratory of Superlight Materials and Surface Technology of Education Ministry, Harbin Engineering University, Harbin 150001, China

  • Corresponding author: DONG Guo-jun, 
  • Received Date: 26 August 2014
    Available Online: 18 October 2014

    Fund Project: Supported by Fundamental Research Funds for Central Universities (HEUCF201403002) (HEUCF201403002)

  • V2O5-WO3/TiO2 catalyst for the selective catalytic reduction of NOx with NH3 (NH3-SCR) was prepared through wet impregnation and characterized by XPS, Raman spectra, H2-TPR, NH3-TPD, NH3-DRIFT, XRD and physical adsorption. The effect of the pH value of vanadium precursor solution on the catalytic performance of V2O5-WO3/TiO2 in the low temperature NH3-SCR of NOx was investigated to optimize the preparation conditions. The results indicated that with the enhancement of precursor solution acidity, more polymeric vanadium species are formed on the catalyst surface; meanwhile, the ratio of V4+(3+)/V5+, surface acidity, and quantity of active sites are increased, whereas the de-NOx performance of the V2O5-WO3/TiO2 catalyst is largely improved. As a result, a V2O5-WO3/TiO2 catalyst with high performance in de-NOx through NH3-SCR can be obtained by enhancing the precursor solution acidity in the preparation process.
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