Cerium and titanium oxides are considered as promising alternative catalysts for selective catalytic reduction with NH₃ (NH₃-SCR) to remove NO_x. However, the poor SO₂ or H₂O tolerance and stability limit their practical applications. Herein, CeTiO_x with nanotube structure (CeTiO_x-T) was prepared by hydrothermal method and used for NH₃-SCR reaction. CeTiO_x-T shows the excellent catalytic activity, SO₂ and H₂O tolerance and stability, in which more than 98% NO conversion can be achieved in the range of 180-390 °C with 100% N₂ selectivity. The characterizations verify that CeTiO_x-T exhibits amorphous structure due to the strong interaction between Ce and Ti to form short-range ordered Ce-O-Ti species. As results, CeTiO_x-T displays the larger BET surface area, more surface Brønsted acid amounts and chemisorbed oxygen, leading to its higher NH₃-SCR performance. In situ DRIFTS results suggest the SCR reaction mainly follow L-H and E-R mechanisms at low and high temperature for over CeTiO_x-T, respectively.

铈和钛氧化物被认为是用NH ₃（NH ₃ -SCR）选择性催化还原以除去NO _x的有前途的替代催化剂。然而，差的SO ₂或H ₂ O耐受性和稳定性限制了它们的实际应用。这里，CeTiO _X与碳纳米管结构（CeTiO _X是由水热法制备并用于NH -T）₃ -SCR反应。CeTiO _x -T具有出色的催化活性，SO ₂和H ₂ O耐受性和稳定性，其中在180-390°C的温度下使用100％N ₂可以达到98％以上的NO转化率选择性。表征证明，由于Ce和Ti之间的强相互作用形成短程有序Ce-O-Ti物种，CeTiO _x -T显示出非晶结构。结果，CeTiO _x -T显示出较大的BET表面积，更多的布朗斯台德酸含量和化学吸附的氧，从而导致其更高的NH ₃ -SCR性能。原位DRIFTS结果表明，对于CeTiO _x -T而言，SCR反应主要遵循低温和高温下的LH和ER机理。