Characterisation of SiO2-supported nickel catalysts for carbon dioxide reforming of methane

Abstract

The CO₂–methane reformation reaction over Ni/SiO₂ catalysts has been extensively studied using a range of temperature-programmed techniques and characterisation of the catalysts by thermogravimetry (TG), X-ray diffraction (XRD) and electron microscopy (TEM). The results indicate a strong correlation between the microstructure of the catalyst and its performance. The role of both CO₂ and CH₄ in the reaction has been investigated and the role of methyl radicals in the reaction mechanism highlighted. A reaction mechanism involving dissociatively adsorbed CO₂ and methyl radicals has been proposed.