Kinetic study of the methane dry (CO2) reforming over the Ce0.70La0.20Ni0.10O2-δ catalyst
The kinetic behaviour of Ce0.70La0.20Ni0.10O2-δ catalyst during methane dry reforming reaction was investigated in a fixed bed reactor in the temperature range of 923-1023K with the partial pressure of CH4 and CO2 ranging between 5 to 50 kPa. The experimental data were fitted using the empirical Power-Law rate equation and Langmuir-Hinshelwood kinetic models, proposed in literature for the Ni-La2O3 catalytic system and based on two step single- and dual-sites mechanism. The obtained fitting results, after statistical and thermodynamic discrimination, show that the mechanism of dry reforming reaction over the Ce0.70La0.20Ni0.10O2-δcatalyst can be successful described by the two steps dual-sites mechanism. The activation energy for the CH4 consumption from Power Law and Langmuir-Hinshelwood models were estimated to be 91.5 and 136.9kJ•mol-1, respectively. The lower activation energy for the CO2 consumption (70.2 and 100.6 kJ•mol-1 from both models, respectively) suggests that the CO2 consumption rate was faster than CH4.