Abstract：Ni based catalyst is considered as a highly efficient catalyst for methane dry reforming (DRM) due to its catalytic activity and cost. However, in real DRM reaction environment, it is a huge challenge to inhibit catalyst deactivation caused by sintering and carbon deposition. A discontinuous FeOx coated Ni composite nano-catalytic structure is fabricated by atomic layer deposition (ALD), which can significantly improve the catalytic activity and effectively eliminate carbon deposition in the DRM reaction. The effects of Fe loading in the catalysts to the performance of the DRM reaction are investigated. With increasing Fe loading, the conversions of CH4 increase, which can reach 64.27% for 0.4FeOx/Ni/Al2O3 catalysts at 650 ℃. On the one hand, the discontinuous coating structure separates the Ni surface to prevent the formation of continuous carbon nanotubes that block the Ni surface. On the other hand, FeOx provides active sites for methane decomposition. More importantly, the addition of FeOx enhances the adsorption and activation of CO2, which is beneficial for reducing formation of the carbon intermediates. The conversions of CH4 of FeOx/Ni/Al2O3 catalysts with Fe content of 0.1wt% reduce only 7% after 72 hours aging at 650 ℃, which implies the excellent durability.
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2020, Vol. 27 