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活性炭吸附二氧化碳性能的研究
引用本文:张丽丹,王晓宁,韩春英,郭坤敏. 活性炭吸附二氧化碳性能的研究[J]. 北京化工大学学报(自然科学版), 2007, 34(1): 76-80
作者姓名:张丽丹  王晓宁  韩春英  郭坤敏
作者单位:北京化工大学理学院,北京,100029;防化研究院一所,北京,100083
摘    要:采用常压流动吸附法研究了活性炭吸附剂在二氧化碳/氮气体系中对二氧化碳的动态吸附性能,比较了其吸附量、吸附穿透曲线和吸附性能的差异,研究了活性炭的比表面积、孔径分布及表面官能团对其二氧化碳吸附性能的影响。结果表明,原料煤的性质影响活性炭对二氧化碳的吸附性能;二氧化碳的吸附量与吸附剂的比表面积、孔径分布有关,但孔径分布是主要的因素。吸附剂的孔径分布在0.5~1.7nm范围内时,有利于对二氧化碳的吸附;经多次循环吸脱附后,吸附剂对二氧化碳的吸附量略有减小并达到恒定值,孔容小和孔径分布窄的吸附剂的吸附量衰减较快。

关 键 词:活性炭  孔隙结构  吸附  表面化学性质
收稿时间:2006-03-07
修稿时间:2006-03-07

Properties of activated carbon for carbon dioxide adsorption
ZHANG LiDan,WANG XiaoNing,HAN ChunYing,GUO KunMin. Properties of activated carbon for carbon dioxide adsorption[J]. Journal of Beijing University of Chemical Technology, 2007, 34(1): 76-80
Authors:ZHANG LiDan  WANG XiaoNing  HAN ChunYing  GUO KunMin
Affiliation:1School of Science,Beijing University of Chemical Technology,Beijing 100029; 2Research Institute of Chemical Defense, Beijing 100083, China
Abstract:A study of the dynamic adsorption characteristics of carbon dioxide in CO2/N2 gas mixtures on activated carbon at atmospheric pressure is reported. Correlations of breakthrough curves, and carbon dioxide saturated adsorption quantities with the physical properties and surface chemical properties of the adsorbent have been studied. It was found that the adsorption of carbon dioxide depends on the properties of the raw coal from which the adsorbents were derived. Specific surface area, pore size and identity of surface groups were all found to influence the carbon dioxide adsorption. A pore size distribution in the range of 0.5 - 1.7 nm leads to enhanced adsorption of carbon dioxide. The carbon dioxide saturated adsorption quantities decrease gradually with cycle number when the support is reused, and eventually attain a constant value. Adsorbents with small pore size show a more rapid decrease in adsorption ability with cycle number. The results reported here offer a method for improving the efficacy of activated carbon adsorbents for use in pressure swing adsorptive processes for removal of carbon dioxide.
Keywords:activated carbon  pore structure  adsorption  surface chemical property
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