The thermal conductivity of CO2 hydrate was measured in this study. The effects of three kinds of nanoparticles

including Al2O3

Cu

and SiO2

with different mass fractions (0.05%

0.1%

and 0.15%) and different nanoparticle dimensions (10

30

and 50 nm) on CO2 hydrate thermal conductivity were investigated. The results show that CO2 hydrate thermal conductivity increases with the increase of temperature

ranging from 0.553 to 0.5861 W·m-1·K-1 at -5-5℃. And the additive of dispersant SDBS has positive influence on thermal conductivity of CO2 hydrate-nanoparticle system. With the same mass fraction and particle size

Cu nanoparticles show better effect to enhance CO2 hydrate thermal conductivity than Al2O3 and SiO2 nanoparticles. But considering the formation of CO2 hydrate and the suspension stability of solution

Al2O3 is more suitable to be used as the promoter of thermal conductivity. The thermal conductivity of CO2 hydrate increases with the decrease of particle size of the Al2O3 nanoparticles. The increase rate of thermal conductivity in 15 nm hydrate-nanoparticle system is 12.7% higher than that in 50 nm hydrate-nanoparticle system. In addition

the increase of CO2 hydrate thermal conductivity is improved from 4.2% to 8.2% when the mass fraction of Al2O3 nanoparticles increases from 0.05% to 0.15%.