doi:10.16186/j.cnki.1673-9787.2019070052

Received:2019/07/11

Revised:2019/10/09

Published:2021/01/15

Preparation of coal-based activated porous carbon and the study ofadsorption separation on CO₂/CH₄

LIU Nan1,2, WEI Jianping1,2,3, LI Yao1,2

1.Key Laboratory of Gas Geology and Gas Control ofHenan Province,Jiaozuo  454000 ,Henan,China;2.School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo  454000 ,Henan,China;3.The Collaborative Innovation Center of Coal Safety Production of Henan Province,Jiaozuo  454000 ,Henan,China

Abstract:In order to separate CO₂  from coalbed methane （ CBM） and further to improve CBM utilization,a series of coal-based active porous carbon （ APC-1 ,APC-2 and APC-4 ） were prepared by adjusting the activation intensity of KOH to anthracite.According to characterization of scanning electron microscopy,KOH activation had an erosive effect on the surface of anthracite and could form developed pore structure.The high specific surface area（993 〜1 615 cm²/g） and total pore volume（0.48 〜0.8 cm³/g） of coal-based active porous carbon could be analyzed by nitrogen adsorption isotherm measurement.The adsorption capacity of APC-2 for CO₂ and CH₄ could be up to 3.49 and 1.59  mmol/g,respectively,at 298 K and 100 kPa.Being predicted by idea adsorption solution theory,the adsorption selectivity of APC-4 for equimolar binary gas CO₂/ CH₄ could reach 4.57.This synthesis process was simple for coal-based active porous carbon preparation,which could provide a wide application prospect in separating  CO₂  from CBM and improving CBM utilization.

Key words:anthracite;coal-based activated porous carbon;coalbed methane;adsorption separation

 煤基活性多孔碳制备及其对CO_2_CH_4的吸附分离研究_刘楠.pdf