铁离子改性碳分子筛对氮气/甲烷分离性能的研究
收稿日期: 2022-05-05
网络出版日期: 2023-01-17
Study on performance of nitrogen/methane separation on iron ions modified carbon molecular sieve
Received date: 2022-05-05
Online published: 2023-01-17
把余德 , 周世奇 , 敬方梨 , 罗仕忠 . 铁离子改性碳分子筛对氮气/甲烷分离性能的研究[J]. 无机盐工业, 2023 , 55(1) : 144 -150 . DOI: 10.19964/j.issn.1006-4990.2022-0260
Aiming at the problem of low separation ratio of carbon molecular sieve to N2/CH4 system，the commercial carbon molecular sieve（CMS） for air separation was used as support to prepare the iron ion-modified carbon molecular sieve by an impregnation method.The adsorption and separation performance of nitrogen/methane on different amount of iron modified carbon molecular sieves was systematically investigated by static adsorption capacity，separation ratio，adsorption kinetics and thermodynamic properties.The results showed that the specific surface area，micropore volume and pore size of adsorbent were reduced due to the loading of Fe3+ species，making the pore size distribution of ultra-microporous adsorbent be more concentrated.This concentration significantly improved the adsorption and separation ratio of carbon molecular sieves for N2/CH4 at the expense of decreased kinetic performance.Under the condition of 303 K and 0.7 MPa，the 0.3%Fe-modified CMS revealed excellent comprehensive performance with a N2/CH4 separation ratio of 6.03.
Key words： N2/CH4; Fe; modification; pressure swing adsorption; carbon molecular sieve
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