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

摘要

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 CeCO2 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.