Experimental study on the reaction between nuclear graphite IG-110 and carbon dioxide

With nuclear graphite IG-110, we measured various kinetic parameters and reaction rates of the C/CO2 reaction. As a result, its activation energy is 295 ± 8 kJ/mol and the order of reaction is 0.9. It turns out that the rate of C/CO2 reaction is much smaller than the rate of the C/O2 reaction which is dominant in HTGR air-ingress below 1400 °C. Finally, we propose the following rate equation for the C/CO2 reaction of IG-110: r C – CO 2 ( kg / m 3 s ) = 3.95 × 10 3 · exp - 290 000 R · T · ( p CO 2 ) 0.9 .