Insights into adsorption separation of N2/O2 mixture on FAU zeolites under plateau special conditions: A molecular simulation study

被引:28
作者
Fu, Yaoguo [1 ,2 ]
Liu, Yingshu [1 ,2 ]
Li, Ziyi [1 ,2 ]
Zhang, Quanli [1 ,2 ]
Yang, Xiong [1 ,2 ]
Zhao, Chunyu [1 ,2 ]
Zhang, Chuanzhao [3 ]
Wang, Haoyu [3 ]
Yang, Ralph T. [4 ]
机构
[1] Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Beijing 100083, Peoples R China
[2] Beijing Higher Inst Engn Res Ctr Energy Conservat, Beijing 100083, Peoples R China
[3] Beijing Union Univ, Coll Biochem Engn, Beijing 100023, Peoples R China
[4] Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA
基金
中国国家自然科学基金; 国家重点研发计划; 北京市自然科学基金;
关键词
PSA oxygen production; Water vapor; Plateau M; olecular simulation; Zeolite; Si/Al molar ratio; SWING ADSORPTION; WATER; GAS; N-2; AIR; PSA; CO2; FAUJASITE; DYNAMICS; CAPTURE;
D O I
10.1016/j.seppur.2020.117405
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Adsorption thermodynamics of N-2 and O-2 on faujasite (FAU) zeolites with different Si/Al molar ratios under plateau conditions of wide ranges of temperature and humidity for pressure swing adsorption (PSA) oxygen production were studied based on validated molecular simulations. Binary adsorption isotherms and N-2/O-2 selectivity on each adsorbent were obtained. The results suggest that dehydrated feed air with very low dew point of 213 K could still lead to -10 wt% water adsorption capacity in FAU zeolites. The effect of water content was larger than that of temperature change on N-2/O-2 separation performance, causing reductions in N-2/O-2 selectivity of 50.9% and af lnities of 15.6% and 10.6% for N-2 and O-2 at 238 K, and those of 45.7%, 13.7% and 11.1% at 298 K on FAU-1.1, respectively. The strong interaction of water with zeolites via hydrogen bond was shown to decrease the pore volume by 25.61%, occupy the cationic sites, and thermodynamically form competitive adsorption over N-2 and O-2. The increase in Si/Al molar ratio suppressed the negative impact of water and temperature change but sacrificed the N-2/O-2 selectivity. To reach an optimal balance between the air separation performance and the adsorbent robustness, X zeolites with Si/Al molar ratio close to 1.5 would be recommended for PSA O-2 production under the plateau special condition.
引用
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页数:9
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