Co3O4催化剂催化低浓度甲烷燃烧性能OA

To explore a facile and eco-friendly synthesis route for Co3O4,the Co3O4 catalysts were synthesized by the solid-phase method using cobalt acetate and oxalic acid as precursors,and its catalytic performance for the combustion of low-concentration methane was evaluated.The catalysts were characterized by X-ray diffraction(XRD),H2 temperature-programmed reduction(H2-TPR),N2 physisorption,and scanning electron microscopy(SEM).The activity and reaction kinetics of Co3O4 in catalytic methane combustion were subsequently investigated.The results revealed that the optimal synthesis conditions included a cobalt acetate-to-oxalic acid molar ratio of 1:3,calcination at 400℃for 4 h,and grinding for 10 min.The obtained catalyst exhibited a pure Co3O4 phase,with surface Co3+species identified as critical active sites for enhancing catalytic performance.Under a gas hourly space velocity(GHSV)of 467 mL·gcat-1·min-1,the temperatures corresponding to 50%(T50)and 90%(T90)methane conversion were 367℃and 437℃,respectively.The apparent activation energy(Eₐ)was determined to be 99.67 kJ·mol-1.This study offers a practical strategy for optimizing Co3O4-based catalysts and advancing the utilization of low-concentration methane sources,particularly coal mine ventilation air methane(VAM).