Promotional effect of Ba additives on MnCeOx/TiO2 catalysts for NH3-SCR of NO at low temperature
| Autor: | Youchun Pan, Qijie Jin, Shemin Zhu, Yuesong Shen |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Mechanical Engineering chemistry.chemical_element Selective catalytic reduction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Redox Oxygen 0104 chemical sciences Catalysis Adsorption X-ray photoelectron spectroscopy chemistry Mechanics of Materials Specific surface area General Materials Science Absorption (chemistry) 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of Materials Research. 33:2414-2422 |
| ISSN: | 2044-5326 0884-2914 |
| Popis: | A series of Ba-modified MnCeOx/TiO2 catalysts were prepared by a wet impregnation method and tested for selective catalytic reduction (SCR) of NO with NH3 at low temperature. The results showed that Ba additives obviously improved the catalytic performance of the MnCeOx/TiO2 catalyst for NH3-SCR, and the BaMnCeOx/TiO2 catalyst with 3 wt% BaO exhibited the optimal catalytic performance. Moreover, the introduction of Ba also improved the resistances toward water vapor and SO2 of catalysts. The N2 adsorption, H2-TPR, and X-ray photoelectron spectroscopy results showed that the addition of Ba increased the specific surface area, redox properties, and concentrations of surface Mn4+ and chemisorbed oxygen of catalysts. Furthermore, NH3-TPD and NO-TPD were used to investigate the absorption of NH3 and NO on the catalyst. The results revealed that although the introduction of Ba significantly promoted the adsorption of NO, it also inhibited the adsorption of NH3. Consequently, the catalytic performance of MnCeOx/TiO2 was greatly improved with the Ba additives. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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