In this study, a series of copper species supported on TiO₂ catalysts were synthesized. With respect to the CuO/TiO₂ catalyst, around 75% NO_x was reduced between 200 and 250 °C and a negative deNO_x efficiency was achieved above 350 °C. The existence of plentiful reactive surface oxygen species favored the activation of NO_x and NH₃, thus leading to satisfactory activity levels at lower temperatures. Due to this, NH₃ over-oxidized to NO_x was also facilitated and the portion of NH₃ reducing NO_x to N₂ or N₂O in the reactions showed a downward trend as temperature increased, which explained the decreasing high-temperature NO_x removal efficiency of this sample. For CuSO₄/TiO₂ and SO₂-treated CuO/TiO₂ catalysts, the generation of plentiful strong acid sites at the expense of the reactive surface oxygen species suppressed the activation of NH₃ and NO_x to some extent at lower temperatures and also negatively affected the over-oxidation of NH₃ to NO_x at elevated temperatures, which explained the changes in the operating temperature window to a high temperature region.

在这项研究中，合成了一系列负载在TiO ₂催化剂上的铜。对于CuO / TiO ₂催化剂，在200至250°C之间还原了约75％的NO _x，而在高于350°C的情况下获得了负的deNO _x效率。丰富反应性表面氧物种的存在有利于NO的激活_X和NH ₃，从而导致令人满意的活性的水平在较低的温度。因此，也促进了NH ₃过度氧化为NO _x，并且一部分NH ₃将NO _x还原为N ₂或N _2。在反应中Ô呈下降趋势随着温度增加，这解释了降低高温NO _X该样品的去除效率。对于CuSO ₄ / TiO ₂和SO ₂处理的CuO / TiO ₂催化剂，以反应性表面氧物种为代价的大量强酸位点的产生在较低温度下以及在一定程度上抑制了NH ₃和NO _x的活化。NH的过度氧化的负面影响₃至NO _X在升高的温度，这说明在工作温度窗口中的变化到高的温度区域。