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通过浸渍法向商业V2O5(WO3)/TiO2催化剂中掺杂了不同浓度的Ni或Zr元素,并对催化剂进行了K中毒前后的活性测试以及EDS、BET、XRD、FT-IR、H2-TPR、XPS表征测试.结果表明,掺杂Ni或Zr后催化剂抗K中毒能力显著增强,EDS和XRD结果显示Ni和Zr能进入催化剂体系,催化剂载体TiO2保持原有锐钛矿晶型,其他元素则以高度分散或无定形状态存在.NH3吸附FT-IR实验证明掺杂Ni后催化剂表面形成了新的Lewis酸位,而Zr的加入使原有Bronsted酸位得以增强,这是两种元素的掺杂均能提高催化剂抗K中毒能力的原因.H2-TPR和XPS实验证实掺杂后催化剂氧化还原能力得到了增强,弥补了比表面积减少的不利因素.
The commercial V2O5 (WO3) / TiO2 catalysts were doped with different concentrations of Ni or Zr by impregnation method. The catalysts were tested for their activity before and after K poisoning as well as EDS, BET, XRD, FT-IR, H2-TPR, XPS characterization test.The results show that the ability of anti-K poisoning of the catalyst after Ni or Zr doping is significantly enhanced, EDS and XRD results show that Ni and Zr can enter the catalyst system, the catalyst carrier TiO2 maintains the original anatase crystal form, the other elements Highly dispersed or amorphous state.NH3 adsorption FT-IR experiments show that the surface of the catalyst doped with Ni formed a new Lewis acid sites, and the addition of Zr so that the original Bronsted acid sites can be enhanced, which is the doping of two elements All of which can improve the reason of the ability of the catalyst to resist K poisoning.H2-TPR and XPS experiments confirmed that the redox ability of the catalyst was enhanced after the doping, which made up for the unfavorable factors of the specific surface area reduction.