An insight on effects of activated carbon and a co-promoter on carbon dioxide hydrate formation and dissociation

The influence of activated carbon (AC) particle size on the formation and dissociation of CO2 hydrates was investigated. ACs with different particle sizes (250-420 mm; 420-841 mm; larger than 841 mm) were employed in the hydrate formation experiment at 276.2 K and 3.6 MPa in the quiescent condition. The result showed that the large AC particle size was more effective on promoting CO2 hydrate formation with shorter induction time, higher gas uptake, and higher formation rate. The study continued to investigate the effects of AC saturated with the solution of sodium dodecyl sulfate (SDS) on the CO2 hydrate formation. It was observed that the addition of 2 mM and 4 mM SDS increased the gas uptake compared with that of AC, while the addition of 6 mM SDS did not. The synergistic effect of SDS and AC was discussed. Moreover, the observed morphology during the hydrate formation and dissociation was provided. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The study found that larger activated carbon particles were more effective in promoting CO2 hydrate formation with shorter induction time and higher formation rate. The addition of 2mM and 4mM sodium dodecyl sulfate (SDS) can increase gas uptake compared to pure activated carbon, while 6mM addition did not show the same effect. The synergistic effect between SDS and activated carbon was discussed.