The promotion effect of Fe on CeZr2O x catalyst for the low-temperature SCR of NO x by NH3
| Autor: | Shu-ming Liu, Ming-yuan Li, Shuai-wei Liu, Peng Sun, Rui-tang Guo, Wei-guo Pan, Xiao Sun, Jian Liu |
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| Rok vydání: | 2018 |
| Předmět: |
In situ
Reaction mechanism Inorganic chemistry Promotion effect Selective catalytic reduction 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Active oxygen Ammonia chemistry.chemical_compound Adsorption chemistry 0210 nano-technology |
| Zdroj: | Research on Chemical Intermediates. 44:3455-3474 |
| ISSN: | 1568-5675 0922-6168 |
| DOI: | 10.1007/s11164-018-3318-z |
| Popis: | Fe was used as the modifier to improve the performance of CeZr2O x catalyst for the selective catalytic reduction (SCR) reaction with ammonia. Experimental results revealed that proper Fe species (Fe/Ce molar ratio = 2) could effectively improve the SCR activity of CeZr2O x , along with the elevated resistance to SO2 and H2O. The characterization results including BET, XRD, H2-TPR and NH3-TPD confirmed that Fe species in Fe2CeZr2O x catalyst could inhibit the formation of ZrO2 crystals and lead to higher reducibility and surface acidity. In addition, more Ce3+ and surface active oxygen species could be detected on Fe2CeZr2O x compared with CeZr2O x . By means of in situ DRIFT technique, it could be deduced that the SCR reaction process over Fe2CeZr2O x was accelerated mainly through theL–H pathway due to the advanced adsorption of NH3 and NO x species, along with the promoted NO conversion to NO2. Therefore, the modification of CeZrO x catalyst by Fe had a significant stimulation effect on its low-temperature SCR performance. |
| Databáze: | OpenAIRE |
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