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 Fuel Chemistry and Technology, ;2016, 44(02): 225-231. shu

Probing NH₃-SCR catalytic activity and SO₂ resistance over aqueous-phase synthesized Ce-W@TiO₂ catalyst

1.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China

Corresponding author: ZHANG Qiu-lin,
Received Date: 15 September 2015
Available Online: 29 November 2015
Fund Project: 国家自然科学基金(U1137603,201307047)项目资助. (U1137603,201307047)

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.
- aqueous-phase method,
- NH₃-SCR,
- Ce-W@TiO₂,
- NO conversion,
- SO₂ resistance
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沈阳化工大学材料科学与工程学院沈阳 110142

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Probing NH₃-SCR catalytic activity and SO₂ resistance over aqueous-phase synthesized Ce-W@TiO₂ catalyst