Effects of the morphology and crystal-plane of TiO2 on NH3-SCR performance and K tolerance of V2O5-WO3/TiO2 catalyst

被引：59
作者：
Cao, Jun [1 ,2 ,3 ,4 ]
Liu, Weizao [3 ,4 ]
Kang, KeKe [1 ,2 ]
Chen, Li [1 ,2 ]
Qiao, Xu [3 ,4 ]
Yao, Xiaojiang [1 ,2 ]
机构：
[1] Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Res Ctr Atmospher Environm, Key Lab Reservoir Aquat Environm CAS, Chongqing 400714, Peoples R China
[2] Univ Chinese Acad Sci UCAS Chongqing, Chongqing Sch, Coll Resources & Environm, Chongqing 400714, Peoples R China
[3] Chongqing Univ, Coll Mat Sci & Engn, Engn Res Ctr Energy & Environm Chongqing, Chongqing 400044, Peoples R China
[4] Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China
来源：
APPLIED CATALYSIS A-GENERAL | 2021年 / 623卷
基金：
中国国家自然科学基金;
关键词：
Morphology and crystal-plane; V2O5-WO3/TiO2; catalyst; K tolerance; NH3-SCR; Reaction mechanism; LOW-TEMPERATURE SCR; IN-SITU FTIR; SELECTIVE REDUCTION; SO2; TOLERANCE; NITRIC-OXIDE; NO; MECHANISM; NANOCRYSTALS; DEACTIVATION; CEO2;
D O I：
10.1016/j.apcata.2021.118285
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
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.
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页数：13
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