Coke-free methane dry reforming over nano-sized NiO-CeO₂ solid solution after exsolution

Exsolution as a method for catalyst preparation is generally only studied in perovskites or similar systems, which puts a constraint on the catalyst support composition, owing to size and charge balance effects. We show that Ni nanoparticle growth occurs via the exsolution mechanism from a NiO-CeO₂ solid solution with the fluorite structure to form the supported Ni/CeO₂ catalyst. This supported catalyst showed high methane dry reforming activity and coke-free performance at 800 °C and using 50 vol% CH₄/50 vol% CO₂ feed gas composition and 5000 Lkg_cat⁻¹ h⁻¹. The use of solid-solutions such as these can therefore expand the variety of catalyst supports which could provide coke-free performance under dry reforming reaction conditions.