Binary metal oxides supported on TiO2 for low-temperature selective catalytic reduction of NOx with NH3

Bi Jun Wu, Xiao Qin Liu, Ping Xiao, Shu Gang Wang

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21 Scopus citations

Abstract

The manganese-based binary metal oxides supported on titanium dioxide (MnOx-A/TiO2) were prepared, where A means Fe2O3, WO3, MoO3 and Cr2O3. Their catalytic activity, N2 selectivity and SO2 poisonous tolerance were investigated. The catalytic performance at low temperature decreased in the following order: Mn-W/TiO2 > Mn-Fe/TiO2 > Mn-Cr/TiO2 > Mn-Mo/TiO2, while N2 selectivity: Mn-Fe/TiO2 > Mn-W/TiO2 > Mn-Mo/TiO2 > Mn-Cr/TiO2. In presence of 0.01% SO2 and 6% H2O, the NOx conversion of Mn-W/TiO2, Mn-Fe/ TiO2, Mn-Mo/TiO2 maintained 98.5%, 95.8% and 94.2% respectively after 8 h at 120°C at GHSV 12600 h-1. As effective promoters, WO3 and Fe2O3 can increase N2 selectivity and the resistance to SO2 of MnOx/TiO2 significantly. The Fourier transform infrared spectrum (FT-IR) spectra of NH3 showed that unlike Fe2O3, WO3 also provides part of Lewis acid sites. In presence of low concentration of SO2, Mn-W/TiO2 exhibited excellent catalytic performance for low temperature selective catalytic reduction of NO with NH3.

Original languageEnglish
Pages (from-to)75-80
Number of pages6
JournalZhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering
Volume28
Issue number23
StatePublished - 15 Aug 2008

Keywords

  • Binary metal oxides
  • Fourier transform infrared spectrum
  • Low-temperature selective catalytic reduction
  • NH temperature programmed desorption
  • Selective catalytic reduction of NO with NH

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