Citation: Lei Pang, Chi Fan, Lina Shao, Junxia Yi, Xing Cai, Jian Wang, Ming Kang, Tao Li. Effect of V₂O₅/WO₃-TiO₂ catalyst preparation method on NO_x removal from diesel exhaust[J]. Chinese Journal of Catalysis, ;2014, 35(12): 2020-2028. doi: 10.1016/S1872-2067(14)60218-7 shu

Effect of V₂O₅/WO₃-TiO₂ catalyst preparation method on NO_x removal from diesel exhaust

Lei Pang ^a,b ,
Chi Fan ^a ,
Lina Shao ^a ,
Junxia Yi ^b ,
Xing Cai ^b ,
Jian Wang ^b ,
Ming Kang ^b ,
Tao Li ^a,c,,

1.
a. School of Chemistry & Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;

Corresponding author: Tao Li,
Received Date: 20 June 2014
Available Online: 2 September 2014

V₂O₅/WO₃-TiO₂ catalysts were prepared by conventional impregnation (VWTi-con) and ultrasound-assisted impregnation methods (VWTi-HUST). Their catalytic performance was tested for the selective catalytic reduction (SCR) of NO with NH₃. The effects of the preparation methods on the catalyst properties were studied. The catalysts were characterized by X-ray diffraction, scanning electron microscopy, Raman and X-ray photoelectron spectroscopy. Both structural investigation and NH₃-SCR activity showed that the preparation method had a strong effect on the thermal behavior of the V₂O₅/WO₃-TiO₂ catalysts. After a hydrothermal treatment, a significant loss of NO reduction activity was observed for the VWTi-con catalyst, which suffered severe sintering and even formed a rutile V_xTi_1-xO₂ solid solution, while the VWTi-HUST catalyst had the same good hydrothermal stability as a commercial catalyst, indicating that the VWTi-HUST catalyst can be used in a commercial diesel after-treatment system. The ultrasound-assisted impregnation method produced a stronger interaction between the vanadium species and WTi support, which stabilized the vanadium species in the reduced state.
- Selective catalytic reduction,
- Nitrogen oxide,
- Vanadium catalyst,
- Hydrothermal stability,
- Diesel engine
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Effect of V₂O₅/WO₃-TiO₂ catalyst preparation method on NO_x removal from diesel exhaust