3 years ago

Pentaerythritol-Based Molecular Sorbent for CO2 Capturing: A Highly Efficient Wet Scrubbing Agent Showing Proton Shuttling Phenomenon

Pentaerythritol-Based Molecular Sorbent for CO2 Capturing: A Highly Efficient Wet Scrubbing Agent Showing Proton Shuttling Phenomenon
Ala’a F. Eftaiha, Ala’a Al-Khateeb, Enas Nabih, Khaleel I. Assaf, Bernhard Rieger, Fatima Alsoubani, Carsten Troll, Abdussalam K. Qaroush
Pentaerythritol (PE) is considered a biodegradable material that combines the ease of synthesis, nonvolatility, and extra stability under basic conditions (acidic gas sequestration, e.g., CO2), which makes it a useful candidate for postcombustion capture (PCC) application. To overcome corrosion problems associated with CO2 binding organic liquids, a binary mixture comprised of PE/1,8-diazabicyclo-[5,4,0]-undec-7-ene (DBU) (1:4 molar ratio) dissolved in dimethyl sulfoxide (DMSO) was exploited for CO2 capturing. The formation of ionic alkyl organic carbonate (RCO3 DBUH+) was confirmed using 13C NMR (157.4 ppm) and ex situ attenuated total reflectance–Fourier transform infrared spectroscopy (ATR-FTIR) (two peaks were identified, viz., 1670 and 1630 cm–1, which were ascribed to the symmetric and asymmetric stretching of both C═O and O···C···O within RCO3H and RCO3, respectively). The charged adduct was measured using a thermostated beaker coupled with conductivity and pH meter probes. The sorption capacity of a 5.0% PE (w/v) solution was measured volumetrically with high efficiencies as, ca. 16 and 18.5 wt %, for wet and dry conditions, respectively. In addition, density functional theory (DFT) was performed to understand the mechanism of action in the case of H2O, and simple alcohols, e.g., methanol and ethanol. Moreover, we reported on the newly discovered medium-dependent proton shuttling phenomenon that was verified experimentally and theoretically.

Publisher URL: http://dx.doi.org/10.1021/acs.energyfuels.7b01125

DOI: 10.1021/acs.energyfuels.7b01125

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