A novel Ni-Ce-Ti mixed oxide catalyst prepared by the hydrothermal method has been developed for the selective catalytic reduction of NO_x by NH₃. It was found that Ni-Ce-Ti catalyst showed high NH₃-SCR activity, excellent N₂ selectivity with broad operation temperature window. Based on the catalyst characterization, the redox cycle (Ni³⁺ + Ce³⁺ ↔ Ni²⁺ + Ce⁴⁺), the amorphous structure and more surface defects over Ni-Ce-Ti catalyst are responsible for the high catalytic deNO_x performance. In situ DRIFT experiments demonstrated that the synergetic effect between Ni and Ce contributes to the formation of reactive NH₃ on Lewis acid sites and monodentate nitrate, thus facilitating the NH₃-SCR reaction to proceed. The present Ni-Ce-Ti catalyst has great potential for the practical removal of NO_x.

通过水热法制备的新型Ni-Ce-Ti混合氧化物催化剂已经被开发出来，用于NH ₃选择性催化还原NO _x。发现Ni-Ce-Ti催化剂显示出高的NH ₃ -SCR活性，优异的N ₂选择性和宽的操作温度范围。基于催化剂的表征，所述氧化还原循环（镍³⁺  + Ce的³⁺  ↔的Ni ²⁺  +铈⁴⁺），无定形结构和更多的表面缺陷在Ni-Ce的Ti催化剂是负责高催化DENO _X表现。原位DRIFT实验表明，Ni和Ce之间的协同作用有助于在路易斯酸位和单齿硝酸盐上形成反应性NH ₃，从而促进了NH ₃ -SCR反应的进行。本发明的Ni-Ce-Ti催化剂具有实际去除NO _x的巨大潜力。