Full
LIU Xujie (1997-), female, Master candidate. E-mail: 915672123@qq.com
Outline
In order to construct a high-efficiency paper catalysts for soot removal, it is very important to design different active elements and realize the synergistic effects with the matrix fibers. A series of La1-xKxMnO3 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) nanofiber catalysts were prepared via electrospinning. The oxidation performance of the catalyst for soot particles was examined by temperature programmed oxidation reaction. The defect effects induced by doping K+ ions in the LaMnO3 lattice on their catalytic performance evaluated by soot temperature-programmed oxidation were investigated by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and temperature programmed reduction analysis. The results show that all the nanofiber catalysts have a perovskite structure, while K2Mn4O8 as a new phase appears in the samples as x ≥ 0.3. The amount of active oxygen in the sample is affected by K+ ions replacing La3+ ions and Mn3+ ions transferring into Mn4+ ions. The replacement of A-site ions increases the degree of oxygen defects in the system, while the transformation of Mn3+ ions into Mn4+ ions determining the number of oxygen vacancies as a new phase can occur at a great content of K+ ions doped in the system. The sample La0.6K0.4MnO3 has an optimum catalytic activity at T50 of 347 ℃. The paper-structured catalyst prepared with a nanofiber to matrix fiber ratio of 1∶1 has a good catalytic activity at T50 of 478 ℃.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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