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标题：HIGH ADSORPTION CAPACITIES OF C〇2 OR CH4 ON POROUS CARBON MATERIALS WITH THE ULTRAMICROPORES
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作者：Yongjie Wei ; Junchao Wang ; Chen Gu 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2020
卷号：29
期号：8
页码：6617-6625
语种：English
出版社：PSP Publishing
摘要：In this work, five porous carbon materials (PC- 1, PC-2, PC-3, PC-4, PC-5) were prepared by using resorcinol-formaldehyde resin as a precursor and KOH as a chemical activator. The effects of temperature, time, and alkali-carbon ratio on activation were investigated. The optimum activation conditions were at a temperature of650 °C ,a time of 2 h, and an alkali to carbon ratio of 2:1. Under such conditions, the adsorption capacities of CO2 and CH4 reached 7.13 mmol/g and 3.54 mmol/g respectively, measured with the ASAP-2020 automatic physical adsorption instrument at 273.15 K and 1 bar. The structural information of porous carbon materials was obtained by N 2 adsorption and CO2 adsorption. The results measured by N 2 adsorption demonstrate that porous carbon materials w ith large specific surface area and large total pore volume measured are not the best adsorbents for CO2 and CH4 under atmospheric pressure. The results of CO2 adsorption analysis at 0 °C show that the ultramicropores less than 1 nm play a decisive role in the adsorption performance. The adsorption performance of CO2 and CH4 in the low pressure region is mainly determined by the ultramicropores. As the pressure increases, the pores w ith larger pore diameters play an increasing role.
关键词：Porous carbon materials;adsorption performance;pore structure