Sol–gel synthesis and investigation of catalysts on the basis of perovskite-type oxides GdMO3 (M = Fe, Co)

• Published in: Journal of sol-gel science and technology Vol. 92; no. 2; pp. 264 - 272
• Main Authors: Yafarova, L. V., Chislova, I. V., Zvereva, I. A., Kryuchkova, T. A., Kost, V. V., Sheshko, T. F.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.11.2019; Springer Nature B.V
• Subjects: Catalysts; Catalytic activity; Ceramics; Chemistry and Materials Science; Cobalt; Composites; Crystal structure; Glass; Inorganic Chemistry; Iron; Materials Science; Methane; Morphology; Nanotechnology; Natural Materials; Optical and Electronic Materials; Original Paper: Sol–gel and hybrid materials for catalytic; Oxides; Perovskites; photoelectrochemical and sensor applications; Reforming; Sol-gel processes; Substitution reactions; Synthesis gas; Thermal analysis; Water gas; Fe and Co substitutions; Perovskites; Catalysts; Sol–gel method; Dry reforming of methane
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-019-05013-3

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. Highlights Nanosized GdCo x Fe 1−x O 3 ( x  = 0; 0.2; 0.5; 0.8; 1) perovskite-type oxides have been synthesized via the sol–gel method. According to XRD patterns the single phase products with orthorhombic structure were obtained. GdCo x Fe 1−x O 3 ( x  = 0; 0.2; 0.5; 0.8; 1) have been tested as catalysts in the dry reforming of methane. The catalytic activity increases in the following 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 .