Abstract In this work, the FeMnTiOx catalysts were modified firstly by tourmaline nanopowders via one-step sol-gel method, aiming at improving the catalytic efficiency. The effects of tourmaline nanopowders on the growth, micro morphology and surface elements valence distribution of the catalysts were systematically analyzed, which showed the tourmaline nanopowders had obvious influence on the growth mechanism of FeMnTiOx. The nano size solid solution catalyst was formed and loaded a 28.52 nm thickness shell on the surface of tourmaline nanopowders, and the contents of surface chemical oxygen, Mn3+ and Mn4+ were enhanced obviously due to the unique structure formed by tourmaline nanopowders. Accordingly, both the operation temperature window and catalytic efficiency of the modified FeMnTiOx catalysts as prepared were improved significantly, which was demonstrated to be an economical and efficient method in the field of low temperature SCR technology.

中文翻译：

---

通过在一步溶胶-凝胶过程中添加电气石纳米粉末来提高 FeMnTiO x SCR 催化剂的催化效率

摘要 本工作首先采用电气石纳米粉体通过一步溶胶-凝胶法对FeMnTiOx催化剂进行改性，以提高催化效率。系统分析了电气石纳米粉体对催化剂生长、微观形貌和表面元素价态分布的影响，表明电气石纳米粉体对FeMnTiOx的生长机理有明显的影响。形成纳米级固溶体催化剂并在电气石纳米粉体表面负载28.52 nm厚的壳层，由于电气石纳米粉体形成的独特结构，表面化学氧、Mn3+和Mn4+的含量明显提高。因此，所制备的改性 FeMnTiOx 催化剂的操作温度窗口和催化效率均显着提高，