石油化工高等学校学报2024，Vol.37Issue(4)：40-48,9.DOI:10.12422/j.issn.1006-396X.2024.04.006
MoOx状态调控及其对VOx/MoOx-TiO2催化剂脱硝性能和热稳定性的影响
The Regulation of MoOx State and Its Effect on the Denitration Performance and Thermal Stability of VOx/MoOx-TiO2 Catalysts
摘要
Abstract
Ammonium heptamolybdate was dissolved in water or oxalic acid solution,and then compounded with TiO2 to prepare MoOx-TiO2 support,and the VOx/MoOx-TiO2 catalysts were obtained after loading vanadium by impregnation method.The structure and properties of the catalysts were characterized by XRD,SEM,BET,XPS,H2-TPR and NH3-TPD,and its denitration activity and high temperature aging performance were investigated.The results showed that the denitrification efficiency of VMoTiO-F prepared by oxalic acid-assisted dissolution of(NH4)6Mo7O24 was greater than 80.0%at 210～510 ℃,which was better than that of VMoTiH-F prepared by water dissolution.Because there was more MoOx on the surface of VMoTiO-F,the interaction with VOx was enhanced,which promoted the production of more low-valence VOx and surface chemisorbed oxygen(Oα)active species on the surface of the catalyst.At the same time,the interaction between VOx and MoOx could also improve the low-temperature redox performance and facilitate the electron transfer in the catalytic process.After high temperature aging,VMoTiH-F had more MoOx into the TiO2 lattice than VMoTiO-F,which was helpful to improve the thermal stability of TiO2.However,anatase TiO2 in VMoTiO-A was seriously sintered or even partially transformed into inert rutile crystal during high temperature aging,resulting in the loss of surface acid sites and the reduction of redox properties.Therefore,the denitrification performance of VMoTiH-A catalyst was significantly higher than that of VMoTiO-A.关键词
VOx/MoOx-TiO2/氨选择性催化还原/MoOx-TiO2复合载体/活性VOx/热稳定性Key words
VOx/MoOx-TiO2/NH3-SCR/MoOx-TiO2 composite support/Active component VOx/Thermal stability分类
化学化工引用本文复制引用
方萍,陈康欣,林雨婷,范楷浩,单承宇,刘雪松..MoOx状态调控及其对VOx/MoOx-TiO2催化剂脱硝性能和热稳定性的影响[J].石油化工高等学校学报,2024,37(4):40-48,9.基金项目
国家自然科学基金面上项目(52370115) （52370115）
浙江省教育厅科研项目(Y202043125) （Y202043125）
绍兴文理学院横向项目(010/2024横). （010/2024横）
