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Stability of a Benzyl Amine Based CO 2 CaptureAdsorbent in View of Regeneration Strategies

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ABSTRACT

Inthis work, the chemical and thermal stability of a primary amine-functionalizedion-exchange resin (Lewatit VP OC 1065) is studied in view of thepotential options of regenerating this sorbent in a CO2 removal application. The adsorbent was treated continuously in thepresence of air, different O2/CO2/N2 mixtures, concentrated CO2, and steam, and then the remainingCO2 adsorption capacity was measured. Elemental analysis,BET/BJH analysis, Fourier transform infrared spectroscopy, and thermogravimetricanalysis were applied to characterize adsorbent properties. This materialwas found to be thermally and hydrothermally stable at high temperatures.However, significant oxidative degradation occurred already at moderatetemperatures (above 70 °C). Temperatures above 120 °C leadto degradation in concentrated dry CO2. Adding moistureto the concentrated CO2 stream improves the CO2-induced stability. Adsorbent regeneration with nitrogen strippingis studied with various parameters, focusing on minimizing the molesof purge gas required per mole of CO2 desorbed.

No MeSH data available.


Normalized CO2 adsorption uptake capacity (evaluatedat 15 vol % CO2, 40 °C) of the IER after long-termexposure to N2 at temperatures of 100, 150, and 200 °C.
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fig2: Normalized CO2 adsorption uptake capacity (evaluatedat 15 vol % CO2, 40 °C) of the IER after long-termexposure to N2 at temperatures of 100, 150, and 200 °C.

Mentions: The thermal and oxidative stability of the IERwas measured in pure N2 and O2 containing gasesat different temperatures. The adsorbent material displays thermalstability when the temperature is below 150 °C, as shown in Figure 2. The sorbent hasbeen tested at 100 and 150 °C; the curves displayed in Figure 2 are straight andoverlapping, indicating that there is no degradation after 50 h atboth temperatures. Yet the sorbent is degraded severely when temperatureis ramped up further to 200 °C. It is found that 39% of the CO2 uptake capacity is lost after continuous exposure in N2 at 200 °C for a time span of 50 h. However, for thisIER a regeneration temperature of 150 °C seems sufficiently highto allow for complete regeneration, and there is no clear need toincrease the temperature beyond this level. Furthermore, this resultcan be regarded as blank test to compare with the results in the succeedingsections.


Stability of a Benzyl Amine Based CO 2 CaptureAdsorbent in View of Regeneration Strategies
Normalized CO2 adsorption uptake capacity (evaluatedat 15 vol % CO2, 40 °C) of the IER after long-termexposure to N2 at temperatures of 100, 150, and 200 °C.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5384483&req=5

fig2: Normalized CO2 adsorption uptake capacity (evaluatedat 15 vol % CO2, 40 °C) of the IER after long-termexposure to N2 at temperatures of 100, 150, and 200 °C.
Mentions: The thermal and oxidative stability of the IERwas measured in pure N2 and O2 containing gasesat different temperatures. The adsorbent material displays thermalstability when the temperature is below 150 °C, as shown in Figure 2. The sorbent hasbeen tested at 100 and 150 °C; the curves displayed in Figure 2 are straight andoverlapping, indicating that there is no degradation after 50 h atboth temperatures. Yet the sorbent is degraded severely when temperatureis ramped up further to 200 °C. It is found that 39% of the CO2 uptake capacity is lost after continuous exposure in N2 at 200 °C for a time span of 50 h. However, for thisIER a regeneration temperature of 150 °C seems sufficiently highto allow for complete regeneration, and there is no clear need toincrease the temperature beyond this level. Furthermore, this resultcan be regarded as blank test to compare with the results in the succeedingsections.

View Article: PubMed Central - PubMed

ABSTRACT

Inthis work, the chemical and thermal stability of a primary amine-functionalizedion-exchange resin (Lewatit VP OC 1065) is studied in view of thepotential options of regenerating this sorbent in a CO2 removal application. The adsorbent was treated continuously in thepresence of air, different O2/CO2/N2 mixtures, concentrated CO2, and steam, and then the remainingCO2 adsorption capacity was measured. Elemental analysis,BET/BJH analysis, Fourier transform infrared spectroscopy, and thermogravimetricanalysis were applied to characterize adsorbent properties. This materialwas found to be thermally and hydrothermally stable at high temperatures.However, significant oxidative degradation occurred already at moderatetemperatures (above 70 °C). Temperatures above 120 °C leadto degradation in concentrated dry CO2. Adding moistureto the concentrated CO2 stream improves the CO2-induced stability. Adsorbent regeneration with nitrogen strippingis studied with various parameters, focusing on minimizing the molesof purge gas required per mole of CO2 desorbed.

No MeSH data available.