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Assessment of CO2 desorption from 13X zeolite for a prospective TSA process
In this study, two configurations of Temperature Swing Adsorption (TSA) were assessed with the aim of evaluating their efficacy on CO 2 capture on commercial adsorbent zeolite 13X within a post-combustion scenario. A fixed bed setup was employed to measure breakthrough curves from the adsorption and...
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Published in: | Adsorption : journal of the International Adsorption Society 2020-07, Vol.26 (5), p.813-824 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | In this study, two configurations of Temperature Swing Adsorption (TSA) were assessed with the aim of evaluating their efficacy on CO
2
capture on commercial adsorbent zeolite 13X within a post-combustion scenario. A fixed bed setup was employed to measure breakthrough curves from the adsorption and desorption steps. Considering a dry desulfurized flue gas stream, breakthrough curves for CO
2
–N
2
(15/75 % v/v) in Helium were performed at 25, 50 and 75 °C. The desorption step was carried out following two TSA regeneration strategies: a two-step desorption arrangement (
configuration 1
) consisting of a purging phase followed by a heating-purging phase, and a one-step desorption arrangement (
configuration 2
) involving only the heating-purging phase. Adsorption equilibrium isotherms were also obtained for pure CO
2
(25, 50, 75, 100 and 125 °C) and N
2
(25, 50 and 75 °C) on zeolite 13X in the range of 0–1 bar. Finally, a mathematical model considering mass and energy differential balances was used to predict the whole adsorption-desorption history. The results obtained on breakthrough curves showed that CO
2
separation from N
2
on zeolite 13X is accomplished by adsorption under the studied conditions with a marked selectivity for CO
2
. In regards to the desorption phase,
configuration
1 may not be adequate for an integration of adsorption-desorption steps once only the purge phase duplicates the desorption time as compared to the adsorption stage. On the other hand,
configuration 2
is more likely to synchronize the whole adsorption—desorption process since the regeneration time was significantly reduced by this strategy. However,
configuration 1
managed to obtain full CO
2
recovery with all the temperatures tested during the heating step, whereas
configuration 2
reached recovery values around 92%. Moderate temperatures (e.g. 125–150 °C) are feasible to be used for
configuration 2
regeneration strategy so as to avoid energy penalties. Simulations were able to reproduce well the experimental breakthrough curves, even though some discrepancies were observed in the desorption histories. |
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ISSN: | 0929-5607 1572-8757 |
DOI: | 10.1007/s10450-019-00192-5 |