Tuning the metal-support interaction in catalysts for highly efficient methane dry reforming reaction

• Ir/Ce0.9Pr0.1O2 catalysts were prepared by CP, DP and SP techniques.
• The locations of Ir species were controlled by the above methods.
• The Ir/Ce0.9Pr0.1O2-DP catalyst exhibited the highest performance in DRM.
• Ir sintering was avoided by the strong metal-support interaction.
• The decrease of DRM performance was assigned to the sintering of mixed oxides.

The metal-support interaction of Ir/Ce0.9Pr0.1O2 catalyst is tuned by adopting different preparation techniques of deposition–precipitation (DP), co-precipitation (CP) and sequential precipitation (SP) to control the locations of Ir, improving catalytic performance in methane dry reforming reaction. Ir/Ce0.9Pr0.1O2-DP catalyst shows the highest catalytic performance and stability due to the unembedded Ir nanoparticles on catalyst surfaces, followed by Ir/Ce0.9Pr0.1O2-SP and Ir/Ce0.9Pr0.1O2-CP catalysts in which Ir species are either partially or fully embedded in Ce-Pr-O mixed oxides. Our results clearly demonstrate that the metal-support interaction plays important roles in controlling the catalyst sintering and carbonaceous deposition.

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