Abstract
Solid adsorbents, containing 50, 70, and 90wt% iron-exchanged heteropolyacid Fe1.5PMo12O40 (Fe–PMA) and mesoporous cellular foams (MCFs), have been synthesized by wetting impregnation. The adsorbents were characterized by a variety of physicochemical, thermal, and spectral techniques, and the CO2 adsorption capacity was investigated. The structure of the Fe–PMA on the surface of support was confirmed by TEM, SAXS, XRD, SEM, FTIR, 29Si, 31P MAS NMR, and XPS. The XPS spectra of Fe 2p3/2, 2p1/2, 3p and Mo 4d5/2, 4d3/2,3d5/2, 3d3/2 confirmed the presence of Fe(2+) and Mo(6+) species in the adsorbent, respectively. The adsorbents displayed a very high adsorption capacity due to the chemisorption of CO2. The CO2 adsorption capacity of the 70wt% Fe–PMA–MCFs sample was 81.8mg/g-adsorbent at 25°C. This indicated that the reported iron (Fe2+) complex could be used as an efficient adsorbent for the separation of CO2. The adsorbents displayed excellent CO2 adsorption and were thermally stable and recyclable.
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