Reaction-Induced Strong Metal-Support Interactions between Metals and Inert Boron Nitride Nanosheets
Jinhu Dong1, Qiang Fu1,2, Haobo Li1
1State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P. R. China.
Abstract:
Encapsulation of metal nanocatalysts by support-derived materials is well known as a classical strong metal-support interaction (SMSI) effect that occurs almost exclusively with active oxide supports and often blocks metal-catalyzed surface reactions. In the present work this classical SMSI process has been surprisingly observed between metal nanoparticles, e.g., Ni, Fe, Co, and Ru, and inert hexagonal boron nitride (h-BN) nanosheets. We find that weak oxidizing gases such as CO2 and H2O induce the encapsulation of nickel (Ni) nanoparticles by ultrathin boron oxide (BO) overlayers derived from the h-BN support (Ni@BO/h-BN) during the dry reforming of methane (DRM) reaction. In-situ surface characterization and theory calculations reveal that surface B-O and B-OH sites in the formed BO encapsulation overlayers work synergistically with surface Ni sites to promote the DRM process rather than blocking the surface reactions.
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