AbstractNickel-containing supported catalysts based on oxides La2O3 and La2O3–Mn2O3 (nLa/nMn = 1/1) synthesized by various methods have been studied in dry reforming of methane (DRM). The effect of the synthesis method on the phase composition and structure of the supports and the catalysts has been studied by low-temperature nitrogen adsorption, X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy. Deficient lanthanum manganite synthesized by the citrate method interacts with nickel ions to form LaNixMn1–xO3 in the surface layer. In the course of reduction of the oxidized precursor with hydrogen, particles of the active component are formed from NiO and LaNixMn1 – xO3, and the proportion between them depends on the ordering of the LaMnO3 + δ support. The H2 : CO ratio changes from 0.7 to 0.8 for the Ni/LaMnO3 and Ni/La2O3 catalysts, respectively; however, for the perovskite sample, no carbon deposition is observed for 8.5 h.