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

Abstract

It is essential to design and exploit high-efficiency denitration catalysts at low temperatures (100−300 °C). In this article, we propose an effective strategy to fabricate a series of catalysts by loading MnO x onto TiO x nanorod arrays with the solimpregnation method (denoted as Mn/TiNR catalysts), which show promising lowtemperature denitration efficiency in the temperature range of 100−300 °C. By the characterizations of physical properties and chemical compositions, it is found that TiO x 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.

Lotus leaves‐derived MnOx/biochar as an efficient catalyst for low‐temperature NH3‐SCR removal of NOx: effects of modification methods of biochar

“…Among these, the supported Mn‐based catalyst has excellent SCR performance and a relatively high utilization rate of active sites on the catalyst 9,12,13 . Therefore, this type of supported MnO x catalyst can greatly reduce the preparation cost, 9,12,14 which has attracted extensive attention in academia and industry. One type of catalyst carrier, carbon materials, including activated carbon, 15,16 graphene, 12,17 carbon nanotubes 18‐20 etc., have found wide application in low‐temperature SCR, because of their high specific surface area and chemical stability.…”