The enhanced resistance to K deactivation of Ce/TiO2 catalyst for NH3-SCR reaction by the modification with P
| Autor: | Shu-ming Liu, Peng Sun, Rui-tang Guo, Shuai-wei Liu, Wei-guo Pan, Ming-yuan Li, Xiao Sun, Jian Liu, Chang-xing Hu |
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| Rok vydání: | 2018 |
| Předmět: |
Reaction mechanism
Chemistry Inorganic chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oxygen 0104 chemical sciences Surfaces Coatings and Films Catalysis Adsorption X-ray photoelectron spectroscopy Fly ash 0210 nano-technology |
| Zdroj: | Applied Surface Science. 436:814-822 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.12.087 |
| Popis: | The deactivation of SCR catalyst caused by K species contained in the fly ash would suppress its DeNOx performance. In this study, it was manifested that the modification of Ce/TiO2 catalyst with P could enhance its K tolerance. To understand the promotion mechanism, the fresh and poisoned catalyst samples were subjected to the characterization techniques including BET, XRD, XPS, H2-TPR, NH3-TPD and in situ DRIFT. The results elucidated that the introduction of P species could increase the reducibility of Ce species and generate more surface chemisorbed oxygen, along with the strengthened surface acidity for NH3 adsorption. It seemed that the NH3-SCR reaction mechanism over Ce/TiO2 catalyst was a combination of L-H mechanism ( |
| Databáze: | OpenAIRE |
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