Experimental study on CO₂ hydrate formation in the presence of TiO₂, SiO₂, MWNTs nanoparticles

ABSTRACT

A series of experiments on CO₂ hydrate formation were carried out in the presence of titanium dioxide (TiO₂), silicon dioxide (SiO₂), multi-walled carbon nanotubes (MWNTs) nanoparticles. The effects of these nanoparticles on induction time, final gas consumption, and gas storage capacity have been investigated at the temperature of 274.15 K and the initial pressure of 5.0 MPa.g. The induction time of CO₂ hydrate formation was remarkably shortened to 12.5 min in the presence of 0.005 wt% MWNTs nanoparticles. The high thermal conductivity and heat capacity of MWNTs nanoparticles presented better heat transfer, and large surface area provided more suitable sites for heterogeneous nucleation of CO₂ hydrate.

KEYWORDS:

• CO₂ hydrate
• nanoparticles
• induction time
• gas consumption
• gas storage capacity

Conflict of interest

The authors declare no competing financial interest.

Additional information

Funding

This work was supported by the Natural Science Foundation of China (NSFC) (No.51704252) and Foundation of Educational Commission of Sichuan Province (No.2017-263).