The enhanced SCR performance of Mn/TiO2 catalyst by Mo modification: Identification of the promotion mechanism. (16th August 2018)

• Record Type: Journal Article
• Authors: Sun, Xiao; Guo, Rui-tang; Liu, Jian; Fu, Zai-guo; Liu, Shuai-wei; Pan, Wei-guo; Shi, Xu; Qin, Hao; Wang, Zhong-yi; Liu, Xing-yu
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 33(2018)
• Page Start: 16038
• Page End: 16048
• Publication Date: 2018-08-16
• Subjects: Mn/TiO2 catalyst -- SCR -- Mo modification -- Promotion; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.07.057
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this work, Mo-modified Mn/TiO2 catalysts synthetized by co-precipitation method were applied in the SCR abatement of NOx by NH3 . Ranging from 50 to 400 °C, Mn/TiO2 modified with Mo showed higher efficiency in SCR reaction than Mn/TiO2 without Mo. Among Mn/TiO2 catalysts with different Mo doping amount, MnMo/TiO2 -0.04 catalyst showed not only the highest SCR activity but also the best N2 selectivity. Furthermore, MnMo/TiO2 -0.04 also exhibited stronger resistance to SO2 poisoning compared with Mn/TiO2 . On the basis of the characterization means including BET, XRD, H2 -TPR, XPS and NH3 -TPD, MnMo/TiO2 -0.04 was characterized with the decreased crystallinity, the increased reducibility and more surface acid sites, along with the enrichment of surface adsorbed oxygen species and Mn 4+ species. Furthermore, the analysis results of in situ DRIFT study showed that Langmuir-Hinshewood (L-H) model should be employed in explaining the accelerated SCR reaction over MnMo/TiO2 -0.04. Graphical abstract: Highlights: Mo modification could effectively enhance the SCR performance and SO2 tolerance of Mn/TiO2 catalyst. The addition of Mo could facilitate the adsorption of NH3 and NOx on Mn/TiO2 catalyst. Mo modification could improve the reactivity of adsorbed NOx and NH3 species over Mn/TiO2 catalyst.