负载型Mn-Ce／TiO2催化剂的制备及其低温脱硝活性

以成型TiO2作为载体，通过浸渍法制备了Mn-Ce／TiO2低温SCR催化剂，并系统研究了制备方法、煅烧条件、活性组分担载量、Mn含量等参数对催化剂催化还原NO性能的影响。结果表明，煅烧温度的升高会促使活性组分结晶度的提高，从而引起催化活性的降低，在500℃和600℃下所得Mn-Ce／TiO2催化剂活性组分为无定型态，表现出较高的脱硝活性。活性组分担载量的增加有利于催化活性的提高。Mn含量对Mn-Ce／TiO2催化剂的活性有较大影响，当Mn／（Mn＋Ce）摩尔比为40％和85％时，催化剂活性最高。

Preparation of supported Mn-Ce/TiO2 catalyst and its NO removal activity at low temperatures

Mn-Ce/TiO2 catalyst was prepared by a simple impregnation process with shaped TiO2 as suppor- ted material and the effect of preparation method, calcination conditions, loading amount of active components, and Mn/（ Mn ＋ Ce） molar ratio on its NO removal activity at low temperature were systematically studied. It was found that the crystallization of active components resulted from the increased calcination temperature would lead to the decline of catalytic activity. The Mn-Ce/TiO2 catalyst obtained at 500℃ and 600℃ exhibited higher NO removal activity because of its amorphous active components. Moreover, the increase of loading amount of active components was beneficial to the improvement of catalytic activity. Meanwhile, Mn-content of as-prepared cata- lyst had a significant influence on its NO removal activity which reached a maximum when Mn/（Mn ＋ Ce） molar ratio was equal to 40% or 85%.