Insights into flower-like Al2O3 spheres with rich unsaturated pentacoordinate Al3+ sites stabilizing Ru-CeOx for propane total oxidation
| Autor: | Honggen Peng, Qiuli Zhang, Tianyao He, Shenyou Yang, Wenming Liu, Yiwei Luo, Jinxiong Tao, Daishe Wu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Valence (chemistry)
Process Chemistry and Technology chemistry.chemical_element 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Sulfur Catalysis 0104 chemical sciences Metal chemistry.chemical_compound chemistry Propane visual_art Carbon dioxide Polymer chemistry visual_art.visual_art_medium 0210 nano-technology Dispersion (chemistry) General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 292:120171 |
| ISSN: | 0926-3373 |
| Popis: | Herein, a series of nano-flower sheet-like alumina spheres (NF-Al2O3) with rich unsaturated pentacoordinate Al3+ sites stabilizing Ru-CeOx catalysts were designed and synthesized for catalytic total oxidation of one typical light alkanes (propane, C3H8). The 90 % conversion temperature (T90) and the apparent activation energy (Ea) of Ru-Ce7/NF-Al2O3 modified by 7 wt.% of CeO2 were as low as 207 °C and 56.7 kJ mol−1, respectively. In addition, it also exhibited superior water, sulfur and carbon dioxide resistance and recycling performance. The excellent catalytic performance of propane total oxidation over Ru-CeOx/NF-Al2O3 is mainly attributed to NF-Al2O3 has rich unsaturated pentacoordinate Al3+ sites can anchor the Ru-CeOx active species. The anchoring effect of Al3+penta on the metal active unit can effectively promote the dispersion of Ru-CeOx active species and stabilize the electronic valence state of Ru0. The degradation of C3H8 over Ru-CeOx/NF-Al2O3 conformed to the Mars-van-Krevelen mechanism through two different pathways as revealed by the in situ DRIFTS. |
| Databáze: | OpenAIRE |
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