Progress in the development of NiO/MgO solid solution catalysts: a review

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NiO/MgO solid solution materials have emerged as highly effective catalysts for various catalytic processes, including dry methane reforming, CO2 hydrogenation, methane partial oxidation, and steam reforming of hydrocarbons. The similar lattice parameters of NiO and MgO allow the formation of homogeneous solid solutions, where metallic Ni particles can be generated through the NiO reduction that is controlled by MgO isolation effect on NiO in the solid solution. The small size of these particles plays a crucial role in preventing carbon deposition and sintering in catalytic reactions. In this review, the basic principles of the formation of NiO/MgO solid solution, the reduction properties of the catalysts, and the insight into its high catalytic activity are elucidated. The synthesis methods of NiO/MgO solid solutions are presented. In addition, the recent progress of catalytic applications of NiO/MgO solid solutions is provided. By offering deep insights into solid solution catalysts, this review aims to facilitate their further development for diverse catalytic processes.