摘要
以低阶烟煤为原料,通过KOH活化法制备了一系列具有相似表面化学结构但孔隙结构不同的煤基活性炭,用以通过PSA技术从煤矿抽采低浓度瓦斯中富集甲烷。制备前后原料表面形态由光滑致密变为疏松多孔,甲烷和氮气的高压吸附等温线表明制备活性炭对甲烷的吸附能力强于氮气,IAST预测结果也表明在低压阶段制备煤基活性炭对混合组分就具有很高的选择性,但是压力越高,选择性随气相甲烷摩尔分数的上升增加地更快,且选择性主要受0.55~0.85nm范围内的微孔影响,中孔及大孔不具备选择性。
In this study,low rank bituminous coal was used as raw material for the preparation of a series of coal based activated carbons(CACs)with similar surface properties but different pore structures,and these CACs could be used to enrich methane from low concentration gas by pressure swing adsorption(PSA)method.The surface morphology of raw material changed from smooth and dense to loose and porous before and after preparation,in addition,the high-pressure adsorption isotherms of methane and nitrogen indicated that the adsorption performance of CACs for methane is stronger than nitrogen.The prediction results by ideal adsorbed solution theory(IAST)method also showed that prepared CACs have a high selectivity for methane and nitrogen mixture at low pressure.But when pressure is higher,the selectivity increases more rapidly with increasing molar fraction of methane in the gas phase.Also,selectivity is mainly affected by micro-pores in the range of 0.55 to 0.85 nm,while meso-pores and macropores are not selective.
作者
张亚潮
付航航
王福军
翁奇
窦成义
ZHANG Yachao;FU Hanghang;WANG Fujun;WENG Qi;DOU Chengyi(Shaanxi Binchang Dafosi Mining Co.,Ltd.,Xianyang 713500,China;Shaanxi Binchang Mining Group Co.,Ltd.,Xianyang 712046,China)
出处
《煤矿安全》
CAS
北大核心
2020年第12期23-26,共4页
Safety in Coal Mines
关键词
活性炭
化学活化
孔隙结构
低浓度瓦斯
甲烷富集
activated carbon
chemical activation
pore structure
low-concentration gas
CH4enrichment
作者简介
张亚潮(1986-),陕西合阳人,学士,2010年毕业于安徽理工大学,现任陕西彬长大佛寺矿业有限公司通风管理部经理,从事矿井通风安全方面的研究工作。
