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JOURNAL OF MECHANICAL ENGINEERING  > 2016  >  44(2): 225-231.
LIU Xin, NING Ping, LI Hao, SONG Zhong-xian, WANG Yan-cai, ZHANG Jin-hui, TANG Xiao-su, WANG Ming-zhi, ZHANG Qiu-lin. Probing NH3-SCR catalytic activity and SO2 resistance over aqueous-phase synthesized Ce-W@TiO2 catalyst[J]. JOURNAL OF MECHANICAL ENGINEERING, 2016, 44(2): 225-231.
Citation: LIU Xin, NING Ping, LI Hao, SONG Zhong-xian, WANG Yan-cai, ZHANG Jin-hui, TANG Xiao-su, WANG Ming-zhi, ZHANG Qiu-lin. Probing NH3-SCR catalytic activity and SO2 resistance over aqueous-phase synthesized Ce-W@TiO2 catalyst[J]. JOURNAL OF MECHANICAL ENGINEERING, 2016, 44(2): 225-231.
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Probing NH3-SCR catalytic activity and SO2 resistance over aqueous-phase synthesized Ce-W@TiO2 catalyst

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  • Corresponding author: Tel: +86 871 65170905, E-mail: qiulinzhang_kmust@163.com
  • Received Date: 15 Sep 2015
  • Rev Recd Date: 29 Nov 2015
    Abstract
  • A series of mixed Ce, W and Ti oxides catalysts have been prepared and employed to selective catalytic reduction of NO with ammonia (NH3-SCR).It was found that Ce-W@TiO2 exhibited the optimal catalytic activity.Over 90% of NO conversion could be obtained by the surface TiO2-coated Ce-W@TiO2 catalyst at 205-515℃.The presence of SO2 leads to a decrease of low-temperature NO catalytic conversion and an increase of NO conversion above 425℃ over various catalysts, while Ce-W@TiO2 exhibits the optimal low-temperature SO2 resistance.It is noted that introducing Ti into Ce-W mixed oxide via the conventional co-precipitation method attributed to the decrease of surface W atomic abundance and acidic sites as well as inferior low-temperature NO conversion and SO2 resistance.In contrast, the surface TiO2-coated Ce-W@TiO2 catalyst prepared via a modified aqueous-phase method exhibit increased surface W atomic abundance and acidic sites as well as the superior low-temperature NO conversion and SO2 resistance.

     

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