| Summary: | In current study various aspects of catalyst development for the Sabatier type methanation reaction were investigated. It was demonstrated that starting from 330–380 °C Mg<sub>2</sub>NiH<sub>4</sub> hydride heating under CO<sub>2</sub> and H<sub>2</sub> gas flow initiates hydride decomposition, disproportionation and oxidation. These reactions empower catalytic properties of the material and promotes CO<sub>2</sub> methanation reaction. Detailed structural, colorimetric and thermogravimetric analysis revealed that in order to have fast and full-scale development of the catalyst (formation of MgO decorated by nanocrystalline Ni) initial hydride has to be heated above 500 °C. Another considerable finding of the study was confirmation that potentially both high grade and low grade starting Mg<sub>2</sub>Ni alloy can be equally suitable for the hydride synthesis and its usage for the promotion of methanation reactions.
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