In order to develop thermostable Raney-type catalysts for the methanation of carbon mono xide, the method of pieparing the Raney-type nickel catalysts was examined. The thermal stabilities of the Ni-Al₂O₃ catalysts depend remarkably on their pretreatment. The thermal stability decreased in the following order: (calcined in air at 550°C)>(calcined in N₂ at 460°C)>(without pretreatment) (Fig.2). For the Ni-Cr₂O₃Al₂O₃ catalysts, the extent of the increase in the Ni crystallite size and the decrease in the amount of H₂ chemisorption during a thermal stability test were found smaller than those by the Ni-Al₂O₃ catalysts (Table 1). The Ni-Cr₂O₃Al₂O₃ catalyst calcined at 550°C was found to be most thermostable of the catalysts tested in this study.

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