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Effects of the morphology and crystal-plane of TiO2 on NH3-SCR performance and K tolerance of V2O5-WO3/TiO2 catalyst
Cao, Jun1,2,3,4; Liu, Weizao3,4; Kang, KeKe1,2; Chen, Li1,2; Qiao, Xu3,4; Yao, Xiaojiang1,2
2021-08-05
摘要V2O5-WO3/TiO2 is the commercial NH3-SCR catalyst, the morphology and crystal-plane of its support can influence the denitration performance and K tolerance efficiently. TiO2 nano-rods (TiO2-NRs, mainly exposed the {100} facets) has larger BET surface area than those of TiO2 nano-octahedrons (TiO2-NOs, mainly exposed the {101} facets) and TiO2 nano-truncated octahedrons (TiO2-NTs, mainly exposed the {001} facets). The larger BET surface area was conducive to the dispersion of active species, thereby generating more active sites and enhancing the amount of V5+ ratio. Moreover, there was a stronger interaction between the active species (V2O5 and WO3) and TiO2-NRs support, which led to the increase of chemisorbed oxygen ratio and the improvement of surface acidity and redox ability. Furthermore, NH3-SCR reaction over V2O5-WO3/TiO2-NRs (i.e., VWTi-NRs) catalyst followed by both Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms. While it only followed by an L-H mechanism over V2O5-WO3/TiO2- NOs (i.e., VWTi-NOs) and V2O5-WO3/TiO2-NTs (i.e., VWTi-NTs) catalysts.
关键词Morphology and crystal-plane V2O5-WO3/TiO2 catalyst K tolerance NH3-SCR Reaction mechanism
DOI10.1016/j.apcata.2021.118285
发表期刊APPLIED CATALYSIS A-GENERAL
ISSN0926-860X
卷号623页码:13
通讯作者Liu, Weizao(liuwz@cqu.edu.cn) ; Yao, Xiaojiang(yaoxj@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000686137900005
语种英语