Abstract: The catalytic properties of GdFeO₃, GdСоO₃, and GdMnO₃ perovskite-type complex oxides in carbon oxide hydrogenation are studied. A correlation between the composition and catalytic properties of the oxide is found. It is shown that carbon monoxide conversion increases in the following order: GdFeO₃ < GdMnO₃ ≤ GdСоO₃; carbon dioxide conversion increases in the reverse order. Differences in the catalytic characteristics of GdFeO₃, GdMnO₃, and GdCoO₃ are attributed to different forms of chemisorbed CO, CO₂, and H₂ and the hydrogen mobility across the catalyst surface. The introduction of carbon dioxide into the reaction mixture suppresses the formation of olefins and causes an increase in methane yield. In the catalytic process, GdCoO₃ is partially decomposed into Gd₂O₃, Co, and Gd₂O₂CO₃. It is assumed that carbon oxides are adsorbed by Gd³⁺ ions (A site), while transition metal ions (B site) are responsible for the formation of atomic hydrogen. It is presumed that carbon sites formed on the surface differ in catalytic activity: some of them are responsible for the formation of unsaturated hydrocarbons, and the others are responsible for the formation of paraffins.