Volume 40 Issue 04
Apr.  2012
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Article Navigation >  Journal of Fuel Chemistry and Technology  > 2012  >  (04): 463-468
WANG Zhi, WANG Deng-jun, WANG Yan-li, QIAO Wen-ming, ZHAN Liang, LING Li-cheng. Low-temperature selective catalytic reduction of NO2 with urea supported on pitch-based spherical activated carbon[J]. Journal of Fuel Chemistry and Technology, 2012, (04): 463-468.
Citation: WANG Zhi, WANG Deng-jun, WANG Yan-li, QIAO Wen-ming, ZHAN Liang, LING Li-cheng. Low-temperature selective catalytic reduction of NO2 with urea supported on pitch-based spherical activated carbon[J]. Journal of Fuel Chemistry and Technology, 2012, (04): 463-468.
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Low-temperature selective catalytic reduction of NO2 with urea supported on pitch-based spherical activated carbon

  • State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

  • Received Date: 2011-03-11
  • Rev Recd Date: 2011-06-24
  • Publish Date: 2012-04-30
    Abstract
  • Urea as reducing agent supported on pitch-based spherical activated carbon (PSAC) was studied for NO2 reduction at low temperatures (30~90℃). The results showed that increasing urea loading from 8% to 30% raised the reaction probabilities of selective catalytic reduction (SCR) of NO2 by urea, which resulted in significant increase of the SCR activity; moreover, the NOx removal period was extended. In the temperature range of 30~90℃, high reaction temperature was unfavorable for NOx removal on account of the decreased NO2 adsorption on PSAC.It was found that the SCR activity was improved by increasing NO2 or O2 concentration in the feed gas. However, further increase in O2 concentration above 9% made a weak contribution to the improvement of the SCR activity. Decreasing space velocity not only increased the SCR activity but also prolonged the NOx removal period. More than 85% NOx conversion for 49 h could be achieved over PSAC with 8% urea loading at 30℃ under the condition of 0.05% NO2, 21% O2 and a space velocity of 2000h-1.
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