Enhancement of the NH3-SCR catalytic activity of MnTiOx catalyst by the introduction of Sb
| Autor: | Wei-guo Pan, Peng Sun, Rui-tang Guo, Shuai-wei Liu, Shu-ming Liu, Jian Liu, Ming-yuan Li, Xiao Sun |
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| Rok vydání: | 2018 |
| Předmět: |
In situ
Process Chemistry and Technology Dispersity Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen Catalysis 0104 chemical sciences High resistance Adsorption chemistry 0210 nano-technology Brønsted–Lowry acid–base theory NOx |
| Zdroj: | Applied Catalysis A: General. 558:1-8 |
| ISSN: | 0926-860X |
| DOI: | 10.1016/j.apcata.2018.03.028 |
| Popis: | Sb was used as the additive to enhance the NH3-SCR performance of MnTiOx catalyst. Experimental results revealed that MnSbTiOx-0.2 demonstrated outstanding NH3-SCR activity in a wide temperature window (100–400 ℃) and high resistance to SO2. Characterization results indicated the introduction of Sb into MnTiOx catalyst could improve the dispersity of active species and generate more surface acid sites, Mn4+ and surface adsorbed oxygen species. In situ DRIFT spectra proved that the presence of Sb in MnSbTiOx-0.2 catalyst could form new Bronsted acid sites, along with the increased surface Lewis acidity. The improved adsorption of NH3 and NOx species over MnSbTiOx-0.2 catalyst had a stimulating effect on the NH3-SCR reaction over it through Langmuir−Hinshelwood (L-H) route. Moreover, Sb species in MnSbTiOx-0.2 could improve the reactivities of ad-NH3 and ad-NOx species in SCR reaction. All these factors contributed to the excellent performance of MnSbTiOx-0.2 catalyst. |
| Databáze: | OpenAIRE |
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