铁离子改性碳分子筛对氮气/甲烷分离性能的研究

doi:10.19964/j.issn.1006-4990.2022-0260

Abstract

Abstract:

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

CLC Number:

TQ424.2

BA Yude,ZHOU Shiqi,JING Fangli,LUO Shizhong. Study on performance of nitrogen/methane separation on iron ions modified carbon molecular sieve[J]. Inorganic Chemicals Industry, 2023, 55(1): 144-150.

Figures/Tables 9

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样品	比表面积/（m²?g^-1）	孔容/（cm³?g^-1）
C3	386.5	0.114
0.3%Fe	362.2	0.112
0.7%Fe	361.1	0.110

样品	N₂				CH₄
样品	q_e/（mol·kg^-1）	B/（MPa^-1）	n	R²	q_e/（mol·kg^-1）	B/（MPa^-1）	n	R²
C3	1.89	1.82	1.06	0.999	0.941	7.47	3.88	0.991
0.05%Fe	1.69	1.64	1.02	0.999	0.81	5.83	3.52	0.988
0.1%Fe	1.68	1.55	1.00	0.990	0.66	3.56	3.10	0.987
0.3%Fe	1.65	2.20	1.18	0.996	0.24	7.62	4.67	0.974
0.5%Fe	1.61	1.87	1.31	0.994	0.11	13.92	4.61	0.988
0.7%Fe	1.60	1.65	1.34	0.992	0.07	45.78	9.54	0.983

样品	N₂
样品	q_m/（mol?kg^-1）	k_s/（10^-3s^-1）	R²
C3	0.924	11.0	0.988
0.05%Fe	0.906	6.5	0.990
0.3%Fe	0.839	4.7	0.997
0.7%Fe	0.741	2.4	0.998

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Study on performance of nitrogen/methane separation on iron ions modified carbon molecular sieve

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