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

doi:10.1016/S1872-2067(16)62510-X

Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (11): 1918-1930.DOI: 10.1016/S1872-2067(16)62510-X

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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

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:2016-05-23 Revised:2016-07-09 Online:2016-11-25 Published:2016-11-25
Contact: Huiyan Zhang,Tel:+86-25-83790667; Fax:+86-25-83791003; E-mail:101011613@seu.edu.cn
Supported by:
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).

Abstract

Abstract:

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.

Key words: Zirconia, Tungsten oxide, Selective catalytic reduction by ammonia, In situ infrared diffuse-reflectance, Fourier-transform spectroscopy, Reaction mechanism

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.

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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

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