钕的添加对V2O5-MoO3/TiO2平板式脱硝催化剂性能的影响

本研究制备了一系列不同Nd含量的V₂O₅-MoO₃-Nd₂O₃/TiO₂平板式脱硝催化剂。采用XRD、N2-吸附脱附、XPS、H2-TPR、拉曼光谱、NH3-TPD和红外光谱等表征手段对催化剂进行分析。结果表明:适量的Nd2O3(0.25%、0.5%,质量分数)可以增强V₂O₅-MoO₃/TiO₂催化剂的还原性能,增加了催化剂的Oα/(Oα+Oβ)比率,从而提升了催化剂的脱硝活性。然而,过量Nd₂O₃(0.75%、1%)的添加,会导致催化剂酸性性能的显著降低,造成催化剂脱硝性能的下降。此外,过量Nd的添加还会对催化剂的耐磨性能有负面影响。各催化剂中,VMoN d(0.5%)/Ti催化剂显示了最佳的脱硝活性。并且,该催化剂还显示了优良的抗SO₂、H₂O性能。

Effect of Neodymium Addition on the Plate-type V2O5-MoO3/TiO2 Catalyst for Selective Catalytic Reduction of NO

A series of plate-type V₂O₅-MoO₃-Nd₂O₃/TiO₂ catalysts with different amounts of neodymium were prepared to investigate the effect of neodymium addition on selective catalytic reduction(SCR) of NO with NH3. XRD, N2-adsorption, XPS, H2-TPR, Raman, NH3-TPD, and FT-IR were used to characterize the catalysts. It is found that with suitable addition of Nd(0.25 wt% and 0.5 wt% Nd₂O₃) to V₂O₅-MoO₃/TiO₂ catalyst not only improves the reduction property, but also increases the Oα/(Oα+Oβ) ratio of the catalyst, which results in the enhancement of catalytic efficiency. However, when the content of Nd₂O₃ is excessive(0.75 wt% and 1 wt%), the acid sites of the catalysts decrease. Accordingly, the catalytic performance of these catalysts is relatively low. Moreover, the mechanical property of the catalyst declines when the content of Nd₂O₃ is excessive. Among the catalysts investigated, VMoN d(0.5)/Ti catalyst has the best catalytic performance, and also exhibits good SO₂ and H₂O resistance.