US EPA

4239434 

Journal Article 

Bis-tris propane in DMSO as a wet scrubbing agent: carbamic acid as a sequestered CO2 species 

Eftaiha, AF; Qaroush, AK; Assaf, KI; Alsoubani, F; Pehl, TM; Troll, C; El-Barghouthi, MI 

2017 

1 

New Journal of Chemistry
ISSN: 1144-0546
EISSN: 1369-9261 

Royal Society of Chemistry 

41 

20 

11941-11947 

English 

10.1039/c7nj02130e 

WOS:000412639800056 

CO2 capture is a hot topic that needs to be addressed by several disciplines, to integrate the structure-activity relationships of sorbents with industrial processes and to augment individual developments into an international collaborative effort. Herein, we suggest a new model compound 1,3-bis[tris(hydroxy-methyl)-methylamino]propane (BTP) dissolved in DMSO as a new wet scrubbing agent. The sequestered species was found to be a carbamic acid dimer, as verified using ex situ attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy with the emergence of a peak at 1722 cm(-1), together with nuclear magnetic resonance (NMR) spectroscopy with a C-13 NMR chemical shift at 157.2 ppm. The formation of carbamic acid rather than carbamate was further elucidated using H-1/C-13 NMR correlation spectra, with coupled cross-peaks at 3.70 ppm together with peaks at 60.3 and 157.2 ppm. Furthermore, the sorbent reusability was proven by bubbling N-2 gas with a molar CO2 loading capacity of 0.91 as measured by using an in situ ATR-FTIR autoclave. C-13 NMR measurements indicated that the formation of the product was kinetically, rather than thermodynamically, controlled. Tris(hydroxymethyl) aminomethane (TRIS) and 1,3-diaminopropane (DAP) were also investigated as sub-structural model units for BTP. The proposed mechanisms were studied theoretically using density functional theory (DFT). 

1,3 propanediamine; carbamic acid; carbon dioxide; dimethyl sulfoxide; propane; trometamol; Article; carbon nuclear magnetic resonance; carbon sequestration; density functional theory; gas; infrared spectroscopy; molar tooth; nuclear magnetic resonance spectroscopy; priority journal; thermodynamics