选用12种物化学性质不同的活性炭,利用TPD对活性炭表面含氧基团的种类和浓度进行考察,使用质谱仪定量分析其含氧基团在不同温度下分解产生的CO2和CO,并通过曲线分峰测定含氧基团的种类和浓度.同时研究了这些活性炭分别对葵烷中的喹啉和吲哚的吸附行为.研究发现:活性炭的吸附符合Langmuir吸附热力学.根据吸附过程中的最大吸附量和吸附常数测定结果,使用多元线性回归方法,对活性炭表面含氧基团种类和浓度与吸附量间的关系进行了关联,建立了含氧基团与吸附量间的定量关系.研究结果表明:活性炭物理性质对其在葵烷吸附脱氮中没有明显影响,而含氧官能团,特别是含羧基的环氧官能团对其脱氮性能起关键性的作用.
Twelve activated carbon (AC) samples with different physical and chemical properties were selected to investigate their ability for the adsorptive denitrogenation of liquid hydrocarbons using two model fuels containing typical nitrogen compounds,indole and quinoline in decane.The surface oxygen-containing groups of the ACs were characterized by temperature-programmed desorption with a mass spectrometer to identify and quantify the type and concentration of the oxygen-containing functional groups based on the CO- and CO2-evolution profiles.The adsorption behavior of AC for nitrogen compounds in decane was found to obey the Langmuir adsorption isotherm.The adsorption parameters (the maximum capacity and the adsorption constant) were estimated.With these results,the correlation between the adsorp tion performance of the AC samples and their physical/chemical properties was evaluated by a multiple linear-regression analysis,which indicated that the physical properties were not the key factors for the removal of the nitrogen compounds in decane.Furthermore,the oxygen-containing groups of ACs,especially the carboxylic acid groups,were found to be mainly responsible for nitrogen adsorption.
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