期刊
CATALYSIS LETTERS
卷 151, 期 11, 页码 3404-3416出版社
SPRINGER
DOI: 10.1007/s10562-021-03585-w
关键词
Low-temperature SCR; Double shell hollow structure catalyst; Nitrogen oxides; In-situ DRIFTS; SO2-tolerance performance
资金
- National Natural Science Foundation of China [U20A20132]
The NixMn3-xO4 and NixMn3-xO4/T (tourmaline) catalysts with a double-layer hollow structure were prepared for low-temperature selective catalytic reduction of NOx with NH3. The addition of tourmaline enhanced the catalytic activity and SO2 tolerance performance of the NixMn3-xO4 catalyst. The SCR reaction mostly follows Langmuir-Hinshelwood (L-H) mechanisms, with nitrate bidentate and bridge nitrate being the primary NOx adsorption materials on the NixMn3-xO4/T catalyst.
NixMn3-xO4 and NixMn3-xO4/T (T represents tourmaline) catalysts with a double-layer hollow structure were prepared by a rigid template method for low-temperature selective catalytic reduction of NOx with NH3 (NH3-SCR). The catalytic activity and SO2 tolerance performance of NixMn3-xO4 catalyst were enhanced by the addition of 2 wt% tourmaline. The results showed the addition of tourmaline could affect the growth, shell thickness and redox property of the NixMn3-xO4 catalysts. The relative contents of Mn4+ and surface chemical oxygen were also increased by the addition of tourmaline, which were beneficial for improving the SCR activity, the catalyst showed 100% NO conversion in a low-temperature range of 125-240 degrees C. The mechanism of SCR reaction and SO2 tolerance were analyzed by In-situ DRIFTS. The SCR reaction process mostly follows Langmuir-Hinshelwood (L-H) mechanisms. The primary NOx adsorption materials on NixMn3-xO4/T catalyst were nitrate bidentate and bridge nitrate, which was not affected by SO2, and it had excellent SO2 tolerance at 150 celcius. [GRAPHICS] .
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