Sol–gel synthesis and investigation of catalysts on the basis of perovskite-type oxides GdMO 3 (M = Fe, Co)

The perovskite-type oxides GdCo x Fe 1−x O 3 (x = 0; 0.2; 0.5; 0.8; 1) synthesized by the sol–gel method were tested as catalysts in the dry reforming of methane to syngas between 500 and 950 °С at atmospheric pressure. Thermal analysis (TG and DSC coupled with MS) and phase analysis (X-ray diffraction) were used for the synthesis parameters control. The morphology and surface area were determined by BET and SEM methods. The highly crystalline, homogeneous and pure solids with well-defined structures were prepared. The mixed GdCo x Fe 1−x O 3 (x = 0; 0.2; 0.5; 0.8; 1) structure belongs to an orthorhombic crystal system with a space group of Pnma (62). The partial substitution of Fe by Co leads to the increase of the catalytic activity. in the row: GdFeO 3 < GdFe 0.5 Co 0.5 O 3 < GdCoO 3 ⩽ GdFe 0.8 Co 0.2 O 3 ≈ GdFe 0.2 Co 0.8 O 3 . An additional point is that the presence of Co in B-site suppresses secondary reactions such as reverse water gas-shift without slowing the dry reforming reaction, which produces syngas in a ratio close to 1. [Figure not available: see fulltext.]. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.