Performance and tolerance to SO2 of MnOx-WO3 /TiO2 catalyst for selective catalytic reduction of NOx with NH3

Bi Jun Wu, Ping Xiao, Jin Ma, Xiao Qin Liu

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The performances of Mn-W/TiO2 catalyst for selective catalytic reduction (SCR) of NO with NH3 and its resistance to different concentrations of SO2 at various temperatures were investigated. The results suggest that WO3 can increase the active sites and enhance the strength of acid. It is an excellent promoter of MnOx/TiO2. The NOx conversion ranges from 80.3% to 99.6% during 100°C to 350°C at gaseous hourly space velocity (GHSV) 18 900 h?1, while N2 product selectivity yields 100%~98.7% over Mn-W/TiO2. The NOx conversion maintains 98.5% at 120°C in presence of 0.01% SO2 and 6% H2O. The impact on catalytic activity will disappear if the temperature rises over 250°C with SO2 concentration above 0.01%. At 300°C the NOx conversion can reach to 99% as high as the commercial V-W/TiO2 catalyst's level with 0.07% SO2 in the stream gas. The Mn-W/TiO2 shows excellent performance for SCR NO with NH3 and it is the one of best catalysts with strong resistance to SO2 by now. It was found that the impact of SO2 is reversible and the activity will recover spontaneously with the rise of temperature.

Original languageEnglish
Pages (from-to)62-67
Number of pages6
JournalZhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering
Volume30
Issue number11
StatePublished - 15 Apr 2010

Keywords

  • MnO-WO /TiO
  • Performance
  • Resistance to SO
  • Selective catalytic reduction of NO with NH

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