Studies of the preparation method of ceria-promoted nickel catalyst for carbon dioxide reforming of methane

•Ceria promoted Ni/Al2O3 reduced the deposited carbon for CO2 reforming of methane.•Reduction of nickel aluminate impregnated with cerium nitrate gave the best catalysts.•Alumina prepared by alkoxide method gave the lowest activity of coke deposition.•CeAlO3 would play an important role for reducing the amount of coke.

The CO2 reforming reactions of methane were carried out using an alumina-supported nickel catalyst. In order to reduce the coke deposition, the preparation methods of the ceria-promoted nickel catalysts were investigated. The physical mixing of CeO2 realized a 50% reduction in the deposited coke per 1 mol of produced CO compared to the catalyst without CeO2. Meanwhile, the catalyst prepared by the impregnation of nickel aluminate with a cerium nitrate solution followed by reduction under a hydrogen stream showed the lowest coke deposition activity. Particularly, the use of alumina prepared by the alkoxide method gave a 5.8% deposited coke produced by the catalyst without CeO2. This type of nickel catalyst showed a high reforming activity without deactivation and a low coke deposition activity.

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