Design of modular Ni-foam based catalysts for dry reforming of methane

Abstract

Novel modular catalysts for dry reforming of methane (DRM) based on chemically modified Ni-foams were prepared by a stepwise synthesis method. A dip coating deposition approach using different aluminium oxide precursors allowed access to aluminium oxide coated Ni-foams as novel conceptual approach to catalyst design. The influence of MgO and SiO₂ as promoters was investigated. Scanning electron microscopy analysis confirmed successful deposition. Additionally, the catalysts were characterized by Kr-physisorption, X-ray fluorescence and X-ray diffraction. Comparing the catalytic performances of the different catalysts in DRM emphasised the major importance of the precursor for the nature of aluminium oxide deposition, catalyst activity, and deactivation degree. The mechanism of catalyst deactivation was thoroughly studied by high-resolution scanning electron microscopy and energy dispersive spectroscopy. Additionally, regeneration profiles were investigated. Overall, the presence of aluminium oxide appears to be essential for catalyst activity and the active sites are likely to be at the nickel–alumina interface.