A New Approach for Retaining Mercury in Energy Generation Processes: Regenerable Carbonaceous Sorbents
Abstract
:1. Introduction
2. Experimental
2.1. Preparation of the Carbon Support
2.2. Impregnation with Gold
2.3. Characterization of the Sorbent
2.4. Hg Retention/Regeneration Device
3. Results and Discussion
3.1. Characterization of the Sorbent
3.2. Hg Retention
3.2.1. Effect of Impregnation with Gold
3.2.2. Effect of the Gas Composition
- In contrast to what was observed in the atmosphere containing only CO2 and N2 where hardly any oxidized mercury was detected at the exit of the reactor, in the atmosphere containing HCl and SO2 an increase in Hg2+ was produced during the regeneration cycles of the CF-Au foam (Table 2).
- In the presence of acid gases, approximately 7% of the desorbed mercury was retained in the Dowex resin evidencing the formation of Hg2+.
- Moreover, the mercury desorption profiles of a regeneration cycle of the CF-Au sorbent after adsorption in the atmospheres containing CO2 and N2 differ significantly from those obtained with CO2, N2, HCl and SO2 in the gas stream (Figure 7). The profiles obtained in the absence of HCl and SO2 show a wide band, with mercury desorption taking place in the 60 to 325 °C range, while that obtained in the presence of these gases is narrower (200 °C–350 °C) with a maximum peak of desorption at 275 °C.
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Method of Analysis | Parameters | CF | CF-Au |
---|---|---|---|
Adsorption N2 | SBET (m2·g−1) | 880 | 850 |
VT (cm3·g−1) | 0.39 | 0.37 | |
VDR-N2 (cm3·g−1) | 0.36 | 0.35 | |
VMeso (cm3·g−1) | 0.03 | 0.02 | |
ICP-MS | Au (wt %) | - | 1.8 |
No. Cycle | R (µg g−1) | % Hgret | % Hg2+ |
---|---|---|---|
1 | 637 | 99.7 | 0.3 |
2 | 601 | 99.7 | 0.3 |
3 | 627 | 98.2 | 1.8 |
4 | 594 | 95.7 | 4.3 |
5 | 615 | 93.7 | 6.3 |
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Fernández-Miranda, N.; Rodríguez, E.; Lopez-Anton, M.A.; García, R.; Martínez-Tarazona, M.R. A New Approach for Retaining Mercury in Energy Generation Processes: Regenerable Carbonaceous Sorbents. Energies 2017, 10, 1311. https://doi.org/10.3390/en10091311
Fernández-Miranda N, Rodríguez E, Lopez-Anton MA, García R, Martínez-Tarazona MR. A New Approach for Retaining Mercury in Energy Generation Processes: Regenerable Carbonaceous Sorbents. Energies. 2017; 10(9):1311. https://doi.org/10.3390/en10091311
Chicago/Turabian StyleFernández-Miranda, Nuria, Elena Rodríguez, Maria Antonia Lopez-Anton, Roberto García, and Maria Rosa Martínez-Tarazona. 2017. "A New Approach for Retaining Mercury in Energy Generation Processes: Regenerable Carbonaceous Sorbents" Energies 10, no. 9: 1311. https://doi.org/10.3390/en10091311