Ni的添加对V-Mo/Ti脱硝催化剂性能的影响

Effect of Ni Doping on the Catalytic Performance of V-Mo/Ti Catalyst for Selective Catalyst Reduction of NO

制备了一系列不同NiO(0%、0.41%、0.93%)含量的V-Mo/Ti脱硝催化剂,考察了NiO含量对催化剂的影响。采用X射线荧光光谱(XRF)、X射线衍射(XRD)、N2-吸附脱附、H2-程序升温还原(H2-TPR)、NH3-程序升温脱附(NH3-TPD)和O2-程序升温脱附(O2-TPD)对催化剂样品进行表征。同时通过固定床微型反应器,对比了不同催化剂脱硝性能和抗SO2、H2O性能的差异。结果表明:V-Mo/Ti催化剂负载Ni后,还原性能和酸性性能都有所提升。同时,NiO的负载还导致了催化剂上化学吸附氧含量的增加,促进NO氧化为NO2。脱硝催化剂负载NiO后,能够有效增强催化剂的脱硝性能和抗SO2、H2O性能。

A series of V-Mo/Ti denitrification catalysts with different NiO(0%、0.41%、0.93%)content were prepared,and the effect of Ni on the catalysts was investigated.The catalysts were characterized by X-ray Fluorescence Spectrometer(XRF),Diffraction of X-rays(XRD),N2-adsorption,H2-Temperature Programmed Reduction(H2-TPR),NH3-Temperature Programmed Desorption(NH3-TPD),and O2-Temperature Programmed Desorption(O2-TPD).The denitrification performance and their resistance to SO2 and H2O of different catalysts were compared through fixed-bed microreactor.The results showed that the reducibility and acidity of V-Mo/Ti catalysts were improved after the loading of NiO.At the same time,the load of NiO also leads to the increase of chemisorption oxygen content on the catalyst,which can promote the oxidation of NO to NO2.It was found that the anti-SO2 and H2O properties of the catalyst could be effectively enhanced after the catalyst was supported with Ni.