Promotional Role of the TiOx Nanorod Arrays as a Support to Load MnOx for Low-Temperature NH3-Selective Catalytic Reduction of NOx: Comparison of Two Preparation Strategies

It is essential to design and exploit high-efficiency denitration catalysts at low temperatures (100-300 degrees C). In this article, we propose an effective strategy to fabricate a series of catalysts by loading MnOx onto TiOx nanorod arrays with the sol-impregnation method (denoted as Mn/TiNR catalysts), which show promising low-temperature denitration efficiency in the temperature range of 100-300 degrees C. By the characterizations of physical properties and chemical compositions, it is found that TiOx nanorod arrays provide a high surface area to load the active sites and improve the interaction between Ti and Mn elements. In comparison with its counterpart that is prepared with a similar approach using the sol that contains both Mn and Ti (Mn-Ti catalysts), the Mn/TiNR catalysts have apparent advantages on the content of surface chemical oxygen, promoting the "fast SCR" reaction. This work provides an effective designation strategy for developing low-temperature selective catalytic reduction (SCR) catalysts via optimizing the interaction of active ingredients.