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  4. 活性炭表面含氧基团与其液相吸附脱氮性能的关系

新型炭材料, 2011, 26(6): 470-478. doi: 10.1016/S1872-5805(11)60093-0

活性炭表面含氧基团与其液相吸附脱氮性能的关系

李娜 1, , 2, , 马筱良 3, , 查庆芳 4,

1.中国石油大学(华东)化学化工学院,山东东营257061;美国宾州州立大学EMS能源研究所,209 Academic Project Building,University Park,PA 16802,USA

2.美国宾州州立大学EMS能源研究所,209 Academic Project Building,University Park,PA 16802,USA

3.美国宾州州立大学EMS能源研究所,209 Academic Project Building,University Park,PA 16802,USA

4.中国石油大学(华东)化学化工学院,山东东营257061

基金项目:   The China Scholarship Council is gratefully acknowledged for supporting LI Na at Pennsylvania State University   The authors thank Dr. WANG Xiao-xing and Dr.ZHU Jian for their assistance with the TPD characterization   This work was partially supported by the US Department of Energy through CPCPC Grant No:(DE-FC26-03NT41874;Subcontract No:3551-TPSU-DOE-1874)  

关键词： 活性炭 , 表面含氧基团 , 吸附脱氮 , 多元线性回归

The role of surface oxygen-containing functional groups in liquid-phase adsorptive denitrogenation by activated carbon

LI Na 1, , MasoudAlmarri 2, , MA Xiao-liang 3, , ZHA Qing-fang 4,

1.中国石油大学(华东)化学化工学院,山东东营257061;美国宾州州立大学EMS能源研究所,209 Academic Project Building,University Park,PA 16802,USA

2.美国宾州州立大学EMS能源研究所,209 Academic Project Building,University Park,PA 16802,USA

3.美国宾州州立大学EMS能源研究所,209 Academic Project Building,University Park,PA 16802,USA

4.中国石油大学(华东)化学化工学院,山东东营257061

Keywords： Activated carbon , Surface oxygen-containing groups , Adsorptive denitrogenation , Multiple linear regression analysis

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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