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Outline
The nano Cu1-x K x Fe2O4 composite catalyst coatings are fabricated on the surface of a self-made absorbing and heating ceramic via the sol-gel method. The performance of this catalyst in directly catalyzing the decomposition of NO gas and the rules influencing its changes are studied under different conditions （microwave radiation power of 0-50 W，reaction temperature of 250-600 ℃，and oxygen concentration of 0%-6%）. The phase composition，microstructure，and catalytic activity of the catalyst are analyzed and characterized by XRD，SEM，H2-TPR，and O2-TPD testing methods. The results show that in the case of different K+ doping amounts，Cu1-x K x Fe2O4 catalysts all generate uniform nanocrystalline particles with a spinel structure. With the increase of K+，as well as the increase of reaction temperature and microwave power，the NO decomposition conversion efficiency of Cu1-x K x Fe2O4 catalysts shows a trend of first increasing and then decreasing. The increase in oxygen concentration is beneficial for NO conversion. Cu0.9K0.1Fe2O4 catalyst reaches the highest NO conversion value of 92.8%，under the reaction temperature of 350 ℃， microwave power of 10 W，and oxygen concentration of 4%. The Cu0.9K0.1Fe2O4 catalyst doped with a certain amount of K+ can promote the formation and increase of oxygen vacancies，which is conducive to the catalytic reaction. Meanwhile，under microwave radiation，the oxygen vacancies on the catalyst surface and polar gas molecules NO can absorb microwave energy and be activated，thereby enhancing the NO decomposition efficiency.
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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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