CAJ | 학술논문

采用巨正则蒙特卡洛(GCMC)及分子动力学(MD)方法探讨了石墨烯/碳纳米管三维骨架结构(GNHS)对等摩尔CO2/CH4二元混合物的吸附分离性能。模拟结果表明CO2比CH4更易吸附于GNHS中, GNHS与(6,6) SWCNT (单壁碳纳米管)相比具有更高的分离性能。随着温度升高, CO2的吸附量快速降低,而CH4的吸附量则呈现出先升高后降低的趋势。最后采用分子动力学方法计算了CO2与CH4的自扩散系数及停留时间等动力学相关参数,发现CO2在GNHS内扩散的阻力更大。而各组分在吸附剂外部吸附层内的扩散过程对混合物的分离也存在一定影响。
채용거정칙몽특잡락(GCMC)급분자동역학(MD)방법탐토료석묵희/탄납미관삼유골가결구(GNHS)대등마이CO2/CH4이원혼합물적흡부분리성능。모의결과표명CO2비CH4경역흡부우GNHS중, GNHS여(6,6) SWCNT (단벽탄납미관)상비구유경고적분리성능。수착온도승고, CO2적흡부량쾌속강저,이CH4적흡부량칙정현출선승고후강저적추세。최후채용분자동역학방법계산료CO2여CH4적자확산계수급정류시간등동역학상관삼수,발현CO2재GNHS내확산적조력경대。이각조분재흡부제외부흡부층내적확산과정대혼합물적분리야존재일정영향。
The adsorption and separation behaviors of CO2 and CH4 binary mixture in graphene/nanotube hybrid structures (GNHSs) are investigated by grand canonical Monte Carlo (GCMC) combined with molecular dynamics (MD) simulations. CO2 is preferential y adsorbed in the adsorbents. Compared with a (6, 6) SWCNT (single wal ed carbon nanotube), GNHSs show improved separation performance. As the temperature rises, the loading of CO2 reduces rapidly while the loading of CH4 first increases before being reduced. Final y, the kinetic parameters of CO2 and CH4, such as self-diffusivity and residence time, are calculated by MD simulation. The CO2 molecules diffusing in the GNHS need to overcome a higher barrier relative to that for CH4. The diffusion of the two components in the adsorption layer outside of adsorbent also influences the separation of the mixture.