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Effect of CO2 atmosphere and presence of NOx (NO and NO2) on the moist oxidation of CO
Fuel ( IF 7.4 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.fuel.2018.09.054
María Abián , Ángela Millera , Rafael Bilbao , María U. Alzueta

Abstract The role of CO2 on the moist oxidation of CO in the CO-NO and CO-NO2 systems is analyzed from both experimental and modelling points of view, under flow reactor conditions, at atmospheric pressure, over the temperature range of 700–1400 K and at fuel-rich (λ = 0.5) and fuel-lean (λ = 2) environments. Sensitivity and reaction rate analyses were used to identify the role of CO2 in this process. Additionally, the effect of the presence of NO and NO2 on CO oxidation is considered. Results indicate significant differences in combustion characteristics between CO oxidation in a 0% or 25% CO2 atmosphere, in the presence of both NO or NO2. In particular, at high temperatures, either NO or NO2 promote the CO oxidation in CO2 atmosphere, through a specific NO-NO2 interconversion system, which is catalysed by the CO2 presence. However, in the 1075–1150 K range and independent of the CO2 atmosphere, the CO oxidation is strongly inhibited by NO2 presence. The effect of CO2 and NOx presence on CO conversion is quite similar for both O2 levels.

中文翻译:

CO2 气氛和 NOx(NO 和 NO2)的存在对 CO 湿氧化的影响

摘要 从实验和建模的角度分析了 CO2 对 CO-NO 和 CO-NO2 系统中 CO 湿氧化的作用,在流动反应器条件下,在大气压下,在 700-1400 K 的温度范围内在富燃料 (λ = 0.5) 和贫燃料 (λ = 2) 环境中。灵敏度和反应速率分析用于确定 CO2 在该过程中的作用。此外,还考虑了 NO 和 NO2 的存在对 CO 氧化的影响。结果表明,在存在 NO 或 NO2 的情况下,在 0% 或 25% CO2 气氛中,CO 氧化的燃烧特性存在显着差异。特别是,在高温下,NO 或 NO2 通过特定的 NO-NO2 相互转化系统促进 CO2 气氛中的 CO 氧化,该系统由 CO2 的存在催化。然而,在 1075-1150 K 范围内并且与 CO2 气氛无关,CO 氧化受到 NO2 存在的强烈抑制。对于两种 O2 水平,CO2 和 NOx 的存在对 CO 转化的影响非常相似。
更新日期:2019-01-01
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