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Three forms of catalyst modification have been explored to elucidate the reaction mechanism and the role of the support in the CO₂ reforming of CH₄. The results of this study show that partial encapsulation of the metal does not significantly alter the catalytic performance and any differences in performance due to varying pretreatment conditions can be ascribed to variations in the particle size. In addition, promoters can be added to the support to increase the thermal stability, increase CO₂ adsorption capacity, and decrease particle growth. Finally, a Pt/ZrO₂-perovskite physical mixture has exhibited high stability for the reforming reaction in the presence of steam and under elevated pressures.