Effect of Supporter on Partial Oxidation of Methane to Syngas

wt) Ni catalyst supported on 5 mm α-Al 2O 3?θ-Al 2O 3?γ-Al 2O 3 pellets was prepared by impregnation method. The catalytic activity was tested on these catalysts. Partial oxidation of methane does not occur on 10% Ni/θ-Al 2O 3 and Ni/γ-Al 2O 3 catalysts after these two catalysts were reduced by H 2 at 500 ℃ for 2 hours. The reason is that reduction doesn't occur on 10% Ni/θ-Al 2O 3 and Ni/γ-Al 2O 3 catalysts under 700 ℃ which means that the reduced Ni is the active site for partial oxidation of methane to syngas. On 10% Ni/α-Al 2O 3 catalyst, the conversion of methane and CO selectivity increases with the increase of reaction temperature and space velocity. XRD measurements reveal that only on 10% Ni/γ-Al 2O 3 catalysts, the supporter transformed from γ-Al 2O 3 to α-Al 2O 3 .