The effects of Sr addition over Ni-exsolved catalysts were explored for dry reforming of methane (DRM). Ni-exsolved catalysts (NiEXS) and conventional Ni-impregnated catalysts (NiIMP) were prepared using a spray-pyrolysis-assisted evaporation-induced ...
The effects of Sr addition over Ni-exsolved catalysts were explored for dry reforming of methane (DRM). Ni-exsolved catalysts (NiEXS) and conventional Ni-impregnated catalysts (NiIMP) were prepared using a spray-pyrolysis-assisted evaporation-induced self-assembly (EISA) method to produce a solid solution and mesoporous structures. In the DRM tests, strontium showed crucial effects for improving the resistance of carbon formation and the stability of the catalyst. Particularly, NiEXS/Sr–Al demonstrated a Ni0 particle size growth of 0.8% and a coking rate of 0.012 gc·gcat–1·h–1, which was remarkably lower than those of the other catalysts (NiIMP/Al, NiIMP/Sr–Al, and NiEXS/Al). This study primarily investigated the catalytic properties and strong metal–support interaction, which depended on the preparation procedure, for verifying the origin of the most stable NiEXS/Sr–Al. In particular, the roles of promotional Sr in enhancing the CO2 adsorption/desorption ability of the catalyst at different temperatures as well as the amount of oxygen species was elucidated in detail.