A novel Fe–Ni–Ti composite oxide prepared via the hydrothermal method has been developed for the selective catalytic reduction of NO_x with NH₃. This environmentally benign catalyst showed high activity and excellent selectivity to N₂, which is superior to that of Fe–Ti and Ni–Ti catalysts. Catalyst characterization results revealed that over Fe–Ni–Ti catalyst the dual redox cycles (Fe³⁺ + Ni²⁺ ↔ Fe²⁺ + Ni³⁺, Ti⁴⁺ + Ni²⁺ ↔ Ti³⁺ + Ni³⁺) are crucial for the enhanced activity. The synergetic effect among Fe, Ni, and Ti leads to not only the increased redox property, but also improved surface acidity. DRIFT experiments demonstrated that more reactive NH₃/NH₄⁺ and M-NO₂ nitro species formed over Fe–Ni–Ti catalyst, thus resulting in the efficiently catalytic removal of NO_x.

中文翻译：

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新型Fe–Ni–Ti催化剂上用NH ₃选择性催化还原NO _x

通过水热法制备的新型Fe-Ni-Ti复合氧化物已被开发出来，用于用NH ₃选择性催化还原NO _x。这种对环境无害的催化剂显示出高活性和对N _2的优异选择性，这优于Fe-Ti和Ni-Ti催化剂。催化剂表征结果表明，在Fe–Ni–Ti催化剂上，双重氧化还原循环（Fe ³⁺ + Ni 2 ⁺ ↔Fe ²⁺ + Ni ³⁺，Ti ⁴⁺ + Ni 2 ⁺ ↔Ti ³⁺ + Ni ³⁺）对于增强活动至关重要。Fe，Ni和Ti之间的协同作用不仅导致氧化还原性能提高，而且表面酸性也得到改善。DRIFT实验表明，更具反应性的NH ₃ / NH ₄ ⁺和M-NO ₂形成在铁-镍-钛催化剂，从而导致有效地催化去除NO的硝基物种_X。