Facile Synthesis of Multi‐Ni‐Core@Ni Phyllosilicate@CeO₂ Shell Hollow Spheres with High Oxygen Vacancy Concentration for Dry Reforming of CH₄

A great challenge for cheap and active Ni‐based catalysts to be utilized for CO 2 (dry) reforming of methane (DRM) reaction is their high‐carbon‐deposition problem. Herein, we designed multi‐Ni‐core@Ni phyllosilicate@CeO 2 (Ni@NiPhy@CeO 2 ) shell hollow sphere catalysts using a facile precipitation method. Compared with Ni@NiPhy without CeO 2 shell, Ni@NiPhy@CeO 2 exhibits high carbon resistance for the DRM reaction at both high GHSV value of 1880 L g −1 cat h −1 at 700 °C and a low reaction temperature of 600 °C. In addition, they show high and stable CH 4 and CO 2 conversions of 72.8 % and 79.1 % respectively at 700 °C under normal GHSV value of 36 L g −1 cat h −1 . The good catalytic performance of Ni@NiPhy@CeO 2 can be attributed to their high sintering resistance of both Ni and CeO 2 which yields a high concentration of oxygen vacancies thereby a high catalytic performance and carbon resistance for DRM reaction. The facile synthesis method in this work can easily be applied to design other core–shell hollow catalysts such as Ni–M (M=Mg, Co, Cu, and Fe) silicate@CeO 2 according to specific applications.