American Chemical Society
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CO2 Capture by Porous Hyper-Cross-Linked Aromatic Polymers Synthesized Using Tetrahedral Precursors

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journal contribution
posted on 2015-11-11, 00:00 authored by Pillaiyar Puthiaraj, Wha-Seung Ahn
Low-cost synthesis of porous hyper-cross-linked aromatic polymers (PHAPs) was achieved via the FeCl3-catalyzed Friedel–Crafts alkylation reaction between tetraphenylsilane or tetraphenylgermanium as a building block and formaldehyde dimethylacetal as a cross-linker. The synthesized polymers were chemically and thermally stable and exhibited high surface areas of up to 1137 m2 g–1 (PHAP-1) and 1059 m2 g–1 (PHAP-2). The adsorption isotherms of the PHAPs revealed a high CO2 adsorption capacity (104.3–114.4 mg g–1) with an isosteric heat of adsorption in the range 26.5–27.3 kJ mol–1 and a moderate CH4 adsorption capacity (12.6–13.8 mg g–1) at 273 K and 1 bar. The PHAP networks also exhibited high CO2/N2 and CO2/CH4 relativities of 29.3–34.2 and 11.3–12.5, respectively, at 273 K.