Thermal Effects on Kinetics and Catalytic Efficiency of LaNiMnO3 in Methane Dry Reforming

In this work a kinetic study over LaNiMnO3 perovskite catalyst in the catalytic dry reforming of methane is investigated. The novel catalyst was prepared using the sol-gel method. The performance experiments were conducted in a fixed bed reactor at temperatures ranging from 500 to 800 °C with feed ratio of (CH4:CO2:N2=1:1:2) ml/min. The temperature effect and time on the catalyst activity and stability were studied. As well as the activation energy and H2/CO ratio are estimated. The reaction rate equation of catalytic dry reforming of methane was investigated by applying the power law model assuming isothermal reaction and the pressure drop was ignored. The catalyst showed 67.43% and 62.2% conversion rates in terms of CH4 and CO2 at 800 ℃, respectively. The kinetic parameters (rate constants and orders) were determined and the activation energy equaled to 30.728 kJ/mol. The catalyst showed H2/CO ratio higher than 1, due to the occurrence of Boudouard side reaction. To conclude, this study develops new catalyst with good catalytic performance and the rate model was successfully investigated.