Abstract:

α-MnO₂ catalysts are prepared by sol-gel method with KMnO₄ and fumaric acid as raw materials. The catalysts are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), N₂ adsorption-desorption measurement and H₂ temperature-programmed reduction (H₂-TPR). The effect of calcination temperature on the catalytic activity for toluene combustion is investigated. The results indicate that when the calcination temperature is 450 ℃, the obtained α-MnO₂ nanoparticles possess high specific BET surface area (60.56 m²·g^-1) and good low-temperature reducibility. Results show that the catalysts have excellent performance in the toluene combustion. The total conversion temperature of toluene is 210 ℃.

Key words: sol-gel method; manganese oxide;toluene; catalytic combustion; calcination temperature