Catalysts Ni/Mg_1−xCe_x⁴⁺O and Ni,Pd,Pt/Mg_1−xCe_x⁴⁺O were developed using the co-precipitation–impregnation methods. Catalyst characterization took place using XRD, H₂-TPR, XRF, XPS, Brunauer–Emmett–Teller (BET), TGA TEM, and FE-SEM. Testing the catalysts for the dry reforming of CH₄ took place at temperatures of 700–900 °C. Findings from this study revealed a higher CH₄ and CO₂ conversion using the tri-metallic Ni,Pd,Pt/Mg_1−xCe_x⁴⁺O catalyst in comparison with Ni monometallic systems in the whole temperature ranges. The catalyst Ni,Pd,Pt/Mg_0.85Ce⁴⁺_0.15O also reported an elevated activity level (CH₄; 78%, and CO₂; 90%) and an outstanding stability. Carbon deposition on spent catalysts was analyzed using TEM and Temperature programmed oxidation-mass spectroscopy (TPO-MS) following 200 h under an oxygen stream. The TEM and TPO-MS analysis results indicated a better anti-coking activity of the reduced catalyst along with a minimal concentration of platinum and palladium metals.