The accumulation of greenhouse gasses (CH₄ and CO₂) results in an increase in the temperature of the atmosphere. The conversion of greenhouse gasses into chemicals and fuels with high added value benefits not only the environment but also energy development. A promising and well-studied process is the reforming of methane, where CH₄ and CO₂ are converted into syngas (CO and H₂). However, catalysts hinder the development of the process. In this paper, we investigate the conversion of CH₄ and CO₂ into syngas using a thermal conversion method. The catalysis performance was evaluated by reforming methane. Ni-based catalysts were prepared by different methods. All prepared catalysts were characterized (XRD, HRTEM et al.), and the process of reforming carbon dioxide–methane was carried out in a fixed bed reactor under atmospheric pressure and a high temperature. Ni(M) @CeO₂ is one of the most popular options due to the role of CeO₂. The deposition of coke in Ni-based catalysts was investigated.