Effects of SO2 on NO adsorption and NO2 formation over TiO2 low-temperature SCR catalyst

Azhar Uddin, Koji Ishibe, Shengji Wu, Caili Su, Eiji Sasaoka

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14 Citations (Scopus)

Abstract

TiO2 is known as a low-temperature selective catalyst for the reduction (LT-SCR) of NO with NH3. Furthermore, it is well-known that the oxidation of NO over the catalyst plays an important role in the LT-SCR. Adsorption of SO2 and NO over two kinds of TiO2 catalysts was investigated using a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effect of the presence of SO2 on the adsorption of NO over the catalysts and the formation NO2 from NO was studied. The relationship between the NO2 formation, the NO adsorption, and the SO2 adsorption was also studied. The presence of SO2 was essential for the oxidative adsorption of NO over the catalysts. SO2 was adsorbed and converted to SO4 2-, then NO adsorbed, on the SO2 pre-adsorbed catalyst and converted to NO3-. The presence of both SO2 and NO contributed to the formation NO2 from NO over the TiO 2 samples. It was found that NO2 was evolved from an equimolar reaction of NO and SO2.

Original languageEnglish
Pages (from-to)1672-1676
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume46
Issue number6
DOIs
Publication statusPublished - Mar 14 2007

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ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

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