The investigation of the course of the Boudouard reaction and methane cracking was performed over nickel catalysts based on oxides of calcium, aluminum, and magnesium. The catalytic samples were synthesized by the impregnation method. The physicochemical characteristics of the catalysts were determined using atomic adsorption spectroscopy (AAS), Brunauer–Emmett–Teller method analysis (BET), temperature-programmed desorption of ammonia and carbon dioxide (NH₃- and CO₂-TPD), and temperature-programmed reduction (TPR). Qualitative and quantitative identification of formed carbon deposits after the processes were carried out using total organic carbon analysis (TOC), temperature-programmed oxidation (TPO), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The selected temperatures for the Boudouard reaction and methane cracking (450 and 700 °C, respectively) were found to be optimal for the successful formation of graphite-like carbon species over these catalysts. It was revealed that the activity of catalytic systems during each reaction is directly related to the number of weakly interacted nickel particles with catalyst support. Results of the given research provide insight into the mechanism of carbon deposit formation and the role of the catalyst support in this process, as well as the mechanism of the Boudouard reaction.

Reducibility of Ni, Co, and Fe on γ-Al ₂ O ₃ governs both DRM activity and nanostructured carbon growth: Ni yields filamentous carbon via tip-growth, Co forms graphitic deposits via surface diffusion, and Fe remains catalytically inactive.

The investigation of the Boudouard reaction and methane cracking was performed over Ni/CaO, Ni/Al2O3, and Ni/MgO. The catalysts were synthesized using co-precipitation. Both catalysts and carbon deposits were studied using AAS, BET, TPD, TPR, TPO, TOC, and XRD. The optimal temperatures for the graphite-like carbon species formation during the reactions were found to be 450 and 700 °C, respectively. The results showed that the activity of the catalytic systems is related to the number of weakly interacted Ni particles with the support. This research provides insight into the carbon deposit formation mechanism and the support role in the reactions.