论文部分内容阅读
碳烟是导致雾霾天气的罪魁祸首,选用适宜的催化剂提高碳烟颗粒的催化活性,可有效消除其对人体和环境的危害。采用溶胶凝胶法在Mn_2O_3(三氧化二锰)中掺杂不同含量的碱金属Rb(铷),合成了类似水钠锰矿和锰钾矿结构的催化剂,并着重探讨了该催化剂的组成和结构对碳烟颗粒燃烧性能的影响。研究结果表明:Rb_(0.6)Mn的催化效果相对最佳,可使碳烟的T_m(碳烟转化率为50%时的温度)达到333℃;Rb_xMn催化剂表面覆盖的碱金属,使得催化剂与碳烟颗粒的表面接触性能因碱金属熔融盐之特性而降低;碱金属与Mn形成的特殊结构(即Rb离子在掺杂过程中会部分富集在催化剂表面),使Mn价态升高,表面氧物种缺陷位增多,从而提高了氧的流动性,进而促进了碳烟的催化燃烧。
Soot is the main culprit of smog weather. Selecting appropriate catalysts to improve the catalytic activity of soot particles can effectively eliminate the harm to humans and the environment. Adopting different content of Rb (rubidium) into Mn_2O_3 (dimanganese tetroxide) by sol-gel method, a catalyst similar to birnessite and cryptomelane structure was synthesized, and the composition and structure of the catalyst Effect on the Combustion Performance of Soot Particles. The results showed that the catalytic effect of Rb_ (0.6) Mn was the best and the T_m of soot (the temperature at 50% soot) reached 333 ℃. The surface of Rb_xMn catalyst covered the alkali metal, The surface contact properties of the smoke particles are reduced due to the characteristics of the molten salt of the alkali metal. The special structure formed by the alkali metal and Mn (ie Rb ions are partially enriched on the catalyst surface during the doping process) Oxygen species defects increased, thus increasing the oxygen mobility, thereby promoting the catalytic combustion of soot.