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Volume 183, 2015
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CO2 capture systems based on saccharides and organic superbases

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Abstract

In this report, novel systems, based on highly abundant saccharides, D-mannose, D-glucose, β-cyclodextrin, alginic acid and mannitol, in combination with an organic superbase, tetramethylguanidine (TMG) or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), are studied for carbon dioxide capture. With D-mannose and D-glucose, several ratios of equivalents of alcohol groups of saccharide : superbase were tested: 1, 0.625, 0.5 and 0.25. High wt% values of CO2 uptake were obtained with TMG-based systems. However, TMG itself can react directly with CO2, and, in the presence of D-mannose, competition between carbonate and carbamate based products was established. In order to circumvent this competition and obtain exclusively the carbonate-based product, DBU was used instead as an organic superbase. In the D-mannose series the highest result was obtained with a D-mannose : DBU ratio eq. = 0.625 (13.9% CO2 uptake, 3.3/5 alcohol groups converted into carbonates). A more effective stirring system, designed to overcome the high viscosity of the products, allowed the use of a D-glucose : DBU = 1 : 1 ratio with 11.5 wt% of CO2 uptake and 2.47/5 alcohol groups converted into carbonates. Additionally a DSC thermal study was performed in order to study the stability/reversibility of the CO2 loaded systems.

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Submitted
27 Apr 2015
Accepted
29 Jun 2015
First published
29 Jun 2015

Faraday Discuss., 2015,183, 429-444
Article type
Paper
Author version available

CO2 capture systems based on saccharides and organic superbases

G. V. S. M. Carrera, N. Jordão, L. C. Branco and M. Nunes da Ponte, Faraday Discuss., 2015, 183, 429
DOI: 10.1039/C5FD00044K

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