Citation: Yaping Zhang, Longfei Wang, Juan Li, Huiyan Zhang, Haitao Xu, Rui Xiao, linjun Yang. Promotional roles of ZrO₂ and WO₃ in V₂O₅-WO₃/TiO₂-ZrO₂ catalysts for NO_x reduction by NH₃: Catalytic performance, morphology, and reaction mechanism[J]. Chinese Journal of Catalysis, ;2016, 37(11): 1918-1930. doi: 10.1016/S1872-2067(16)62510-X shu

Promotional roles of ZrO₂ and WO₃ in V₂O₅-WO₃/TiO₂-ZrO₂ catalysts for NO_x reduction by NH₃: Catalytic performance, morphology, and reaction mechanism

Yaping Zhang ^a, ,
Longfei Wang ^a ,
Juan Li ^a ,
Huiyan Zhang ^a ,
Haitao Xu ^a,b ,
Rui Xiao ^a ,
linjun Yang ^a

a Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China;
b Nanjing Yuhang Environmental Technology Company, Nanjing 211102, Jiangsu, China

Received Date: 23 May 2016
Revised Date: 9 July 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (51306034), Key Research & Development Projects of Jiangsu Prov-ince (BE2015677) and the National Basic Research Program of China (2013CB228505).

V₂O₅/TiO₂-ZrO₂ catalysts containing various amounts of WO₃ were synthesized. The catalyst mor-phologies, catalytic performances, and reaction mechanisms in the selective catalytic reduction of NO_x by NH₃ were investigated using in situ diffuse-reflectance infrared Fourier-transform spectros-copy, temperature-programmed reduction (TPR), X-ray diffraction, and the Brunau-er-Emmett-Teller (BET) method. The BET surface area of the triple oxides increased with increasing ZrO₂ doping but gradually decreased with increasing WO₃ loading. Addition of sufficient WO₃ helped to stabilize the pore structure and the combination of WO₃ and ZrO₂ improved dispersion of all the metal oxides. The mechanisms of reactions using V₂O₅-9%WO₃/TiO₂-ZrO₂ and V₂O₅-9%WO₃/TiO₂ were compared by using either a single or mixed gas feed and various pretreatments. The results suggest that both reactions followed the Eley-Ridel mechanism; however, the dominant acid sites, which depended on the addition of WO₃ or ZrO₂, determined the pathways for NO_x reduction, and involved[NH₄⁺-NO-Brönsted acid site]^* and[NH₂-NO-Lewis acid site]* intermediates, respectively. NH₃-TPR and H₂-TPR showed that the metal oxides in the catalysts were not reduced by NH₃ and O₂ did not reoxidize the catalyst surfaces but participated in the formation of H₂O and NO₂.
- Zirconia,
- Tungsten oxide,
- Selective catalytic reduction by ammonia,
- In situ infrared diffuse-reflectance,
- Fourier-transform spectroscopy
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Promotional roles of ZrO₂ and WO₃ in V₂O₅-WO₃/TiO₂-ZrO₂ catalysts for NO_x reduction by NH₃: Catalytic performance, morphology, and reaction mechanism