Effects of SO2 and H2O on low-temperature NO conversion over F-V2O5-WO3/TiO2 catalysts  

作　　者：Quanming Liang Jian Li Hong He Tao Yue Li Tong 

机构地区：[1]Beijing Municipal Institute of Labor Protection,Beijing Academy of Science and Technology,Beijing 100054,C hina [2]Key Laboratory of Beijing on Regional Air Pollution Control,Beijing University of Technology,Beijing 100124,China

出　　处：《Journal of Environmental Sciences》2020年第4期253-261,共9页环境科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2017YFC0210303);the Key Research and Development Program of Hebei province of China(No.19273706D);the Beijing Millions of Talents Project(No.2018A36);the National Natural Science Foundation of China(No.21607009);the Youth Core Plan of Beijing Academy of Science and Technology(No.YC201806)

摘　　要：F-V2 O5-WO3/Ti02 catalysts were prepared by the impregnation method.As the content of F ions increased from 0.00 to 0.35 wt.%,the NO conversion of F-V2 O5-WO3/TiO2 catalysts initially increased and then decreased.The 0.2 F-V2 O5-WO3/TiO2 catalyst(0.2 wt.%F ion)exhibited the best denitration(De-NOx)performance,with more than 95%NO conversion in the temperature range 160-360℃,and 99.0%N2 selectivity between 110 and 280℃.The addition of an appropriate amount of F ions eroded the surface morphology of the catalyst and reduced its grain size,thus enhancing the NO conversion at low temperature as well as the sulfur and water resistance of the V2 O5-WO3/Ti02 catalyst.After selective catalytic reduction(SCR)reaction in a gas flow containing SO2 and H2 O,the number of NH3 adsorption sites,active component content,specific surface area and pore volume decreased to different degrees.Ammonium sulfate species deposited on the catalyst surface,which blocked part of the active sites and reduced the NO conversion performance of the catalyst.On-line thermal regeneration could not completely recover the catalyst activity,although it prolonged the cumulative life of the catalyst.In addition,a mechanism for the effects of S02 and H2 O on catalyst NO conversion was proposed.

关 键 词：Fions Low temperature selective catalytic reduction Sulfur resistance On-line thermal regeneration 

分 类 号：X701[环境科学与工程—环境工程]