【摘要】 以TiO2为载体,采用挤压成型法制备了钒系蜂窝整体式SCR脱硝催化剂,通过N2吸附-脱附(BET)、X射线衍射(XRD)、扫描电镜(SEM)、FT-Ra-man光谱等表征手段和催化活性测试对混合练泥工序中助催化剂WO3不同引入方式制备的催化剂进行了对比研究。实验结果表明,由钛钨粉制备的催化剂具有较大的比表面积及孔容积;而由偏钨酸铵制备的催化剂具有较均匀的微观结构形貌,活性物种分散性好,拥有更多的VO6八面体结构,且出现了WOx四面体结构,表现出良好的NH3-SCR活性和较宽的活性温度窗口,在空速为10000h-1,氨氮比为1.0时,活性温度范围内NO脱除率达到了93%。更多还原

【Abstract】 Vanadium contained honeycomb monolithic SCR DeNOx catalysts were prepared by extrusion molding with TiO2 as support.The catalysts obtained with different introduce way of WO3 in mixing process were comparative researched.The catalysts were characterized by brunauer-emmett-teller(BET),X-ray diffraction(XRD),scanning electron microscope(SEM),FT-Raman and evaluated by catalytic activity test.The experimental results show that: catalyst made by WO3-TiO2 powders has a higher surface area and a larger porous volume.Catalyst made by ammonium metatungstate has homogeneous microscopic structure.The active species are well dispersed on TiO2.In addition,much more actahedral vanadyl species is formed and tetrahedral wolframyl species is found.It presents a superior activity and has a wide activity temperature window.The NOx conversion is up to 93% in the activity temperature range at the gas hourly space velocity of 10000 h-1,n(NH3)/n(NO)=1.更多还原