Investigation and characterization on MnOx/TiO2 for low-temperature selective catalytic reduction of NOx with NH3

Bi Jun Wu, Xiao Qin Liu, Shu Gang Wang, Lin Zhu, Lin Yan Cao

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A series of catalysts of manganese oxides supported on TiO2 with various loadings of manganese and calcination temperatures were prepared. The catalytic activity in low temperature selective catalytic reduction of NOx with NH3 was investigated. With the aid of such characteristics as X-ray diffraction (XRD), surface area (BET), temperature programmed reduction (TPR), Fourier transform infrared (FT-IR) and NH3 temperature programmed desorption (NH3-TPD), the optimum condition for MnOx/TiO2 catalysts preparation was found. The NOx conversion increases with the loading of manganese, while the N2 selectivity decreases. The calcination temperature also has an impact on the activity and selectivity. Both of the catalytic activity and the N2 selectivity of MnO2 are higher than those of the mixture of MnO2 and Mn2O3. At a space velocity of 12 600 h-1, MnO2 yields 97% NOx conversion at 80°C and nearly 100% conversion and 100% N2 selectivity at 120°C. With the presence of 6% H2O, the conversion reaches 99.0% at 120°C. This suggests that MnO2 is the most promising catalytic species for low temperature selective catalytic reduction of NO with NH3.

Original languageEnglish
Pages (from-to)221-226
Number of pages6
JournalRanshao Kexue Yu Jishu/Journal of Combustion Science and Technology
Volume14
Issue number3
StatePublished - 2008

Keywords

  • Low-temperature selective catalytic reduction
  • MnO/TiO
  • Selective catalytic reduction (SCR)

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