Citation: SONG Zhong-xian, ZHANG Qiu-lin, ZHANG Jin-hui, NING Ping, LI Hao, WANG Yan-cai, WANG Ming-zhi, DUAN Yan-kang. Effect of WO₃ content on the catalytic activity of CeO₂-ZrO₂-WO₃ for selective catalytic reduction of NO with NH₃[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(6): 701-707. shu

Effect of WO₃ content on the catalytic activity of CeO₂-ZrO₂-WO₃ for selective catalytic reduction of NO with NH₃

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

Corresponding author: NING Ping,
Received Date: 4 January 2015
Available Online: 10 March 2015
Fund Project: 国家自然科学基金(U1137603) (U1137603)云南省人陪基金(14118682) (14118682)昆明理工大学分析测试基金(20140588) (20140588)四川理工学院重点实验室开放基金(LYJ1309)。 (LYJ1309)

A series of CeO₂-ZrO₂-WO₃ catalysts (CZW) was prepared by the hydrothermal method. The effect of WO₃ content on their catalytic properties for selective reduction of NO_<em>x with NH₃ was investigated. The catalysts were characterized by X-ray diffraction, N₂ sorption, H₂ temperature-programmed reduction, NH₃ temperature-programmed desorption and NO temperature-programmed desorption techniques. It was shown that WO₃ existed as amorphous species in the CZW. Introduction of WO₃ in the CZW dramatically enhanced its surface acidity and gave rise to strongly adsorbed NO species, consequently increasing the catalytic activity. In addition, appropriate amounts of WO₃ also increased the surface area and improved the reduction behavior of the catalyst. Compared to the CeO₂-ZrO₂, the CZW with 20% WO₃ not only exhibited high resistivity to SO₂, but also had a wider reaction temperature window. It showed a NO_x conversion of> 90% at the space velocity of 60 000 h^-1 in the temperature range of 200~463 ℃.
- selective catalytic reduction,
- WO₃,
- redox property,
- acidity
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Effect of WO3 content on the catalytic activity of CeO2-ZrO2-WO3 for selective catalytic reduction of NO with NH3

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Effect of WO₃ content on the catalytic activity of CeO₂-ZrO₂-WO₃ for selective catalytic reduction of NO with NH₃