Hydrogenation of carbon dioxide: a comparison of different types of active catalysts

Comparison of the activity and CO selectivity of four principally different types of catalysts in CO₂ hydrogenation, namely, LaNi₅, Rh/ZnO–CuO, fumed Fe₂O₃–K₂O–Al₂O₃ and Au/SO₄–ZrO₂, in the entire temperature range at an atmospheric pressure was performed. The use of the intermetallide LaNi₅ catalyst provides an enhanced activity in CO₂ hydrogenation with prevailing methane formation, while other catalysts demonstrated predominant formation of CO.