Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10263733 | Chemical Engineering Science | 2005 | 10 Pages |
Abstract
Commercial sorption-based air separation is usually done using nitrogen selective zeolites in pressure swing adsorption (PSA) systems. Separation of air by adsorption of less abundant oxygen is more desirable. In this study we have developed some stable oxygen selective sorbents with silver and cerium salts. AgCl, AgBr, AgI and CeCl3 all showed stable adsorption characteristics with pure component selectivity of O2/N2â¼2.0-3.0 at 1Â atm. For these salts heat of adsorption of oxygen was found to be slightly higher than that of nitrogen, which was also predicted by ab initio molecular orbital calculations by Chen and Yang (Ind. Eng. Chem. Res. 35 (1996) 4020). The adsorption capacity of these salts was increased by thermal dispersion on high surface area SiO2 support. AgBr thermally spread on SiO2 is the best sorbent obtained in this study. AgBr/SiO2 (1.0Â g/g) showed a pure component oxygen selectivity of â¼3 at 1Â atm and â¼5 at 7Â atm. PSA simulations were used to show the feasibility of nitrogen production using AgBr/SiO2.
Keywords
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Ambalavanan Jayaraman, Ralph T. Yang,