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/N2 ∼ 2.0-3.0 at 1 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/SiO 2 (1.0 g/g) showed a pure component oxygen selectivity of ∼ 3 at 1 atm and ∼ 5 at 7 atm. PSA simulations were used to show the feasibility of nitrogen production using AgBr/SiO2.
| Original language | English |
|---|---|
| Pages (from-to) | 625-634 |
| Number of pages | 10 |
| Journal | Chemical Engineering Science |
| Volume | 60 |
| Issue number | 3 |
| DOIs | |
| State | Published - Feb 2005 |
Keywords
- AgBr/SiO
- Air separation
- Cerium salts
- Magnetic susceptibility
- Oxygen sorbent
- Pressure swing adsorption
- Silver salts
- Thermal dispersion
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