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:rC–CO2(kg/m3s)=3.95×103·exp-290000R·T·(pCO2)0.9.