Vanadium oxide-based catalysts are considered a promising catalyst for selective catalytic reduction (SCR) of NO with NH₃, which is an effective NO_x removal technology. As environmental issues have garnered more attention, however, improvements to vanadium-based SCR catalysts are strongly required. In a previous study, we found that vanadium oxide on microporous titania as a support (V/MPTiO₂) has certain advantages, such as improved thermal stability and more suppressed N₂O formation, over the use of conventional nanoparticle titania (DT-51) as a support. In this study, widely used promoters, such as W, Sb, and Mo, were added to V/MPTiO₂ to investigate whether they have promoting effects on V/MPTiO₂ as well. Among these promoters added catalysts, the W and Mo were found to have significant promoting effects on the enhancement of deNO_x activities at low temperatures, while the addition of Sb to V/MPTiO₂ tended to have a negative effect on the SCR activity. Based on the characterizations, including laser Raman, H₂-temperature programmed reduction (H₂-TPR), and in situ diffuse reflectance infrared Fourier transform (in situ DRIFT) analysis, we found that the addition of W and Mo increased the degree of polymerization in V/MPTiO₂, which generated more reactive vanadia species. Hence, such changes, resulting from the addition of W and Mo promoters to V/MPTiO₂, yielded enhanced catalytic activity at low temperatures.

基于氧化钒的催化剂被认为是用于选择性催化还原NO的（SCR）与NH一个有前途的催化剂₃，它是一种有效的NO _X去除技术。但是，由于环境问题引起了越来越多的关注，因此迫切需要对钒基SCR催化剂进行改进。在先前的研究中，我们发现以微孔二氧化钛为载体（V / MPTiO ₂）的氧化钒与常规的纳米二氧化钛（DT-51 ）相比具有某些优势，例如改善了热稳定性，并抑制了N ₂ O的形成。 ）作为支持。在这项研究中，广泛使用的促进剂，例如W，Sb和Mo，被添加到V / MPTiO _2中，以研究它们是否对V / MPTiO具有促进作用。_2也一样。在添加这些促进剂的催化剂中，发现W和Mo对低温下的deNO _x活性的增强具有显着的促进作用，而向V / MPTiO _2中添加Sb倾向于对SCR活性具有负面影响。基于所述表征，包括激光拉曼，H ₂ -温度编程还原（H ₂ -TPR），并在原位漫反射红外傅里叶变换（原位DRIFT）的分析，我们发现，加入W和Mo的增加程度在V / MPTiO _2中聚合，生成更多的反应性钒。因此，这种变化是由于在V / MPTiO _2中添加了W和Mo促进剂而引起的。在低温下产生增强的催化活性。