Layered Mg-Al spinel supported Ce-Fe-Zr-O oxygen carriers for chemical looping reforming
| Autor: | Kongzhai Li, Kun Yang, Xing Zhu, Yannan Zhao, Jiangyong Yuan, Haiwen Xu, Chunqiang Lu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Materials science General Chemical Engineering Spinel chemistry.chemical_element 02 engineering and technology General Chemistry engineering.material 021001 nanoscience & nanotechnology Biochemistry Oxygen Redox Methane Steam reforming chemistry.chemical_compound 020401 chemical engineering chemistry Chemical engineering engineering Water splitting 0204 chemical engineering 0210 nano-technology Chemical looping combustion Syngas |
| Zdroj: | Chinese Journal of Chemical Engineering. 28:2668-2676 |
| ISSN: | 1004-9541 |
| DOI: | 10.1016/j.cjche.2020.06.035 |
| Popis: | A series of layered Mg-Al spinel supported Ce-Fe-Zr-O oxygen carriers were prepared for co-production of syngas and pure hydrogen via chemical looping steam reforming (CLSR). The presence of magnesium-aluminum layered double oxides (MgAl-LDO) significantly increases the specific surface area of the mixed oxides, reduces the particle size of CeO2-based solid solution and promotes the dispersion of free Fe2O3. When reacting with methane, MgAl-LDO supported oxygen carrier shows much lower temperature for methane oxidation than the pure Ce-Fe-Zr-O sample, indicating enhanced low-temperature reactivity. Among different Ce-Fe-Zr-O(x)/MgAl-LDO samples, the Ce-Fe-Zr-O(40 wt%)/MgAl-LDO sample shows the best performance for the selective oxidation of methane to syngas and the H2 production by water splitting. After a long period of high temperature redox experiment, the Ce-Fe-Zr-O(40 wt%)/MgAl-LDO oxygen carrier still shows high activity for syngas generation. The comparison on the morphology of the fresh and cycled oxygen carriers indicates that the Mg-Al spinel support still forms a stable skeleton structure with high dispersion of active components on the surface after the long-term cycling, which contributes to excellent redox stability of the Ce-Fe-Zr-O(40 wt%)/MgAl-LDO oxygen carrier. |
| Databáze: | OpenAIRE |
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