GAO Y R, WANG Y, LI Y.Study on flexible N-doped activated porous carbon cloth preparation and its CO2/CH4 adsorption separation and methanol adsorption[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):45-53.

doi:10.16186/j.cnki.1673-9787.2021040078

Received:2021/04/19

Revised:2021/09/03

Published:2022/11/25

Study on flexible N-doped activated porous carbon cloth preparation and its CO2/CH4 adsorption separation and methanol adsorption

GAO Yaru1, WANG Yan1, LI Yao1,2

1.School of Safety Science and Engineering，Henan PolytechnicUniversity，Jiaozuo 454000，Henan，China；2.Key Laboratory of Gas Geology and Gas Governance of Henan Province，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract:In order to develop an economical，efficient and safe nano-porous carbon material for the adsorption and separation of CO₂/CH₄ and the adsorption of methanol，one-step carbonization/activation process was adopted to prepare the flexible nitrogen-doped activated porous carbon cloths via selecting viscose fiber fabric as the precursor and CO₂ as active agent，and the effect of activation temperature on the development of porosity structure and chemical composition of porous carbon was analyzed.The results showed that the FPCC-A-800 was prepared at the activation temperature of 800 ℃，possessing ultra-micropore volume as high as 0.29 m3/g，accounting for 71% of the total pore volume，and the nitrogen content of 5.88%.At 25 ℃ and 0.1 MPa，the FPCC-A-800 has the highest CO₂ adsorption capacity of 3.13 mmol/g.According to the ideal adsorption solution tdheory（IAST），the selectivity of FPCC-A-800 for binary gas mixture CO₂/CH₄（the volume ratio 50/50） was calculated to be 2.35，which should be attributed to the synergistic effect between excellent ultra-microporous structure and moderate nitrogen content.The FPCC-A-900 was prepared at the activation temperature of 900 ℃，possessing the best methanol adsorption capacity of 9.90 mmol/g at 25 ℃ and 0.009 5 MPa，which should be attributed to its maximum specific surface area（1 159 cm²/g） and total pore volume （0.54 cm³/g）.The FPCC-A-700 was prepared at the activation temperature of 700 ℃，possessing the highest nitrogen content，and exhibiting the best CO₂/CH₄ separation performance at lowpressure.According to Henry’s calculation，the CO₂/CH₄ selectivity coefficient FPCC-A-700 was 3.36 at 25 ℃.The experiments showed that the as-prepared flexible N-doped active porous carbon cloth had a good application prospect in controlling the greenhouse gas，improving the utilization rate of coalbed methane，and enhancing the adsorption of industrial methanol.

Key words:flexible;N-doped;activated porous carbon cloth;CO/CH adsorption separation;methanol adsorption

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