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Investigation of functionalized carbon nanotubes' performance on carbon dioxide hydrate formation

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  • Omar Nashed, Universiti Teknologi Petronas
  • ,
  • Behzad Partoon
  • Bhajan Lal, Universiti Teknologi Petronas
  • ,
  • Khalik Mohamad Sabil, Heriot-Watt University Malaysia Campus
  • ,
  • Azmi Mohd Shariff, Universiti Teknologi Petronas
In this work, the impact of functional group on the thermodynamics and kinetics of CO2 hydrates are investigated experimentally. The hydroxylated multi-wall carbon nanotubes (OH-MWCNT) and carboxylated carbon nanotubes (COOH-MWCNT) along with pristine carbon nanotubes (MWCNT) are selected for this study. The carbon nanotubes are suspended in a 0.03 wt% sodium dodecyl sulfate (SDS) aqueous solution and the results are compared with SDS aqueous solution at the same concentration of 0.03 wt% and deionized water. The CO2 hydrate phase boundary and kinetic parameters of CO2 hydrate formation including induction time, the initial rate and amount of gas consumed, gas uptake, storage capacity, and water to hydrates conversion are studied. The results show that the nanofluids studied do not affect the equilibrium conditions of CO2 hydrates. In addition, 0.01 and 0.05 wt% of COOH-MWCNT mixed with 0.03 wt% SDS showed highest initial hydrate formation rate and gas uptake. Furthermore, a comparison between SDS and COOH-MWCNT (without stabilizer SDS) at 0.03 wt% revealed that addition of COOH-MWCNT to the water enhance the initial hydrates formation rate compared to SDS
Original languageEnglish
JournalEnergy
Volume174
Pages (from-to)602-610
Number of pages9
ISSN0360-5442
DOIs
Publication statusPublished - May 2019
Externally publishedYes

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