Silica-alumina zeolite adsorbents for oxygen generation via pressure swing adsorption: Mechanisms and challenge

变压吸附 空气分离 沸石 吸附 化学工程 材料科学 气体分离 氧气 体积热力学 杂质 工艺工程 催化作用 化学 有机化学 工程类 热力学 生物化学 物理
作者
Qingjun Yu,Yixiao Cai,Quanli Zhang,Ye Li,Ningqi Sun,Wenhai Liu,Yingshu Liu,Honghong Yi,Xiaolong Tang
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:481: 148788-148788 被引量:16
标识
DOI:10.1016/j.cej.2024.148788
摘要

The adsorptive generation of oxygen from air has become increasingly important in the chemical and medical industries due to the growing demand for O2 with high purity. Among the commonly used three methods of cryogenic distillation, pressure swing adsorption (PSA) and membrane separation for N2/O2 separation, PSA has received much attention due to the advantages of small volume, low management cost, and short start-up time, etc. Zeolites, with their unique pore structure, highly polarized pore environment, and abundant ion exchange sites, are widely employed as an efficient adsorbent in N2/O2 separation. Hence, in this work, a review about the application of zeolites in O2 generation via PSA was performed. In detail, the common PSA techniques applied for O2 generation were summarized and compared from both the characteristics and application scenarios firstly. Then, the main mechanisms of O2 separated from N2 in air over zeolite by adsorption were summarized from three aspects of the steric effect, kinetic effect and equilibrium effect. Based on above, the requirements for silica-alumina zeolite adsorbents to improve the O2 purity clarified from skeleton topology, extra-framework cations as well as physical & chemical properties. Moreover, the operation conditions and impurities having a significant effect on the product O2 quality were discussed. Finally, both the challenges and prospects of air separation and O2 generation are proposed based on existing research results.
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