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Mechanistic Study on Adsorption and Oxidation of NO over Activated Carbon Fibers

Author: YangHui
Tutor: QiuJianRong
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: activated carbon fibers adsorption oxidation NO SO2 XPS FTIR
CLC: X773
Type: Master's thesis
Year: 2013
Downloads: 20
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Abstract


Sulfur oxides （SO2） and nitrogen oxides （NOx） are considered to be the most toxicgases resource in our country. SO2emissions have been effectively curbed with thelarge-scale implementation of coal-fired power plant flue gas desulfurization. Thennitrogen oxide emission control is increasingly important. In this paper, themulti-pollutant gas analyzer was conducted experimental studies of viscose-basedactivated carbon fibers adsorption removal of NO in a small fixed-bed adsorptionreactor under nitrogen and oxygen atmosphere. Combined with XPS, TPD, FTIRcharacterization methods, the mechanism of ACF adsorption oxidization NO wasstudied by comparison of the the samples adsorption properties in differentatmospheres. On this basis, this paper investigates the mechanism of simultaneous ofNOx and SOx by ACFs.The methods such as hydrogen peroxide （H2O2） solution impregnation, heattreatment were employed separately to modify the activated carbon fibers, and theremoval efficiency of NO by the activated carbon fibers before and after modificationin the inert nitrogen atmosphere, oxygen-containing atmosphere were investigated,furthermore, the change of activated carbon fibers characteristics such as pore structureas well as nitrogenous or oxygenous surface functional groups were also discussed inorder to explore the effect of oxygen-containing functional groups and O2inatmosphere on the NO catalytic oxidation and the transformation process of NO to NO2.The results show that the C-O functional groups of activated carbon fiber surfaceplay oxidation on the adsorbed NO in nitrogen atmosphere. adsorbed NO is oxidized to-NO2by the C-O functional groups; On the other hand, in oxygen atmosphere,-NO2and-NO3were detected in activated carbon fibers surface after activated carbon fibersadsorb NO. It was found that NO removal efficiency in stable stage after long time testwas almost unanimous when using the original activated carbon fibers as well as thetwo modified ones, which indicated that the transformation of NO to NO2was mainlyresulted from the reaction between the adsorbed NO on activated carbon fibers with the free oxygen in atmosphere. O2volume fraction can significantly promote the NOcatalytic oxidation effect, indicating that the oxygen-containing functional groups onthe initial physical adsorption of NO greater impact, less impact on the wholeadsorption process. The conclusion can be drawn that it is the gaseous O2makeadsorbed NO oxidize rather than adsorbed oxygen in N2/O2atmosphere.The adsorption of SO2/NO and simultaneous adsorption of SO2and NO wereinvestigated in N2and O2atmosphere. FTIR and TPD were used to analyze the changeof surface functional groups and adsorption strength before and after the adsorptionprocess. Based on this, this paper explores the mechanism of simultaneous adsorptionof SO2and NO. The results showed that the oxygen-containing functional groupsplay oxidation on the adsorbed SO2and NO in nitrogen atmosphere. O2can react withthe part of the nitrogen-containing functional groups to nitroso form which providesSO2adsorption sites in separate adsorption SO2process.-NO3was detected inactivated carbon fibers surface after activated carbon fibers adsorb NO. In the processof simultaneous adsorption SO2and NO, adsorbed NO was oxidized to-NO2and-NO3which provide adsorption sites for SO2. Adsorbed SO2was oxidized to sulphateform by–NO2and–NO3while the nitrogen-containing functional groups wererestored.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Power of industrial waste treatment and comprehensive utilization > Electric Power Industry
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