臭氧协同Fe/SSZ-13分子筛催化氧化低浓度甲烷的性能研究
Catalytic Oxidation of Low-Concentration Methane by Ozone-Assisted Fe/SSZ-13 Zeolite
At present, for the catalytic oxidation of lowconcentration methane, there exist the problems such as high ignition temperature and large consumption of precious metals. In order to explore a lowcost, clean and efficient methane removal technology, the effects of Fe loading, O3/CH4 and space velocity on catalytic oxidation of methane were investigated based on the strong oxidation of ozone and the excellent adsorption of Fe/SSZ-13 zeolite. The research results show that the methane conversion rate can reach 80.8% under the conditions of 1% Fe loading, CH4/O3=1∶6 and 200 ℃ reaction temperature. By means of BET, XRD, NH3-TPD, H2-TPR, UV-Vis and XPS, Fe loading is proved to be able to increase the specific surface area of catalyst, promote the formation of more acidic sites and regulate the valence distribution and species of iron on the catalyst surface, which promotes catalytic ozonation of methane. According to insitu infrared test, O3 can activate active sites and hence promote methane adsorption and catalytic oxidation.
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