Abstract
Solid adsorbents comprising 50, 70, and 90wt.% heteropolyacid Fe 2.0SiW 12O 40 (Fe-HPA) and mesoporous cellular foams (MCFs) have been synthesized by wetting impregnation. The adsorbents were characterized by various physicochemical, thermal and spectral techniques and the CO 2 adsorption capacity of the adsorbents were investigated. The structure of Fe-HPA on the surface of the support was confirmed by TEM, SAXS, XRD, SEM, FTIR, 29Si MAS NMR, and XPS. XPS of the Fe 2p 3/2, 2p 1/2, 3p and W 4f 7/2, 4f 5/2, 4d 5/2, 4d 3/2 confirmed the presence of typical Fe( 2+) and W( 6+) in the adsorbent, respectively. The adsorbents showed a very high adsorption capacity due to the chemisorption of CO 2. The CO 2 adsorption capacity of a 70wt.% Fe-HPA-MCF sample was 111.8mg/g-adsorbent at 25°C. This result indicated that the reported iron (Fe 2+) complex could be used as an efficient adsorbent for the separation of CO 2. The adsorbents displayed excellent CO 2 adsorption capacity and were thermally stable and recyclable.
Original language | English |
---|---|
Pages (from-to) | 161-168 |
Number of pages | 8 |
Journal | Powder Technology |
Volume | 233 |
DOIs | |
State | Published - Jan 2013 |
Keywords
- CO adsorption
- HPAs
- MCFs
- Silicotungstic acid
- XPS