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Merck

CO2 capture systems based on saccharides and organic superbases.

Faraday discussions (2015-09-22)
G V S M Carrera, N Jordão, L C Branco, M Nunes da Ponte
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Trimethylgallium, packaged for use in deposition systems
Sigma-Aldrich
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Sigma-Aldrich
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Sigma-Aldrich
D-Mannitol, BioUltra, ≥99.0% (sum of enantiomers, HPLC)
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D-(+)-Glucose, powder, BioReagent, suitable for cell culture, suitable for insect cell culture, suitable for plant cell culture, ≥99.5%
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D-(+)-Glucose, ≥99.5% (GC)
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D-(+)-Glucose, suitable for mouse embryo cell culture, ≥99.5% (GC)
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D-Mannitol, ≥98% (GC)
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Potassium bromide, BioXtra, ≥99.0%
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D-(+)-Glucose, BioUltra, anhydrous, ≥99.5% (sum of enantiomers, HPLC)
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N,N,N′,N′-Tetramethylguanidine, ≥99.0% (GC)
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1,8-Diazabicyclo[5.4.0]undec-7-ene, 98%
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Potassium bromide, anhydrous, free-flowing, Redi-Dri, ACS reagent, ≥99%
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Potassium bromide, anhydrous, free-flowing, Redi-Dri, ReagentPlus®, ≥99%
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