Role of oxide support in Ni based catalysts for CO methanation.

The CO methanation reaction of reduced and unreduced Ni based CeO, AlO, TiO and YO supported catalysts was investigated. The Ni/CeO and Ni/YO catalysts exhibited similar CO conversions at all reaction temperatures. The catalysts were studied by X-ray diffraction (XRD), H chemisorption, H temperature-programmed reduction (TPR), and diffuse reflection infrared Fourier transform spectroscopy (DRIFTS); the results suggested that the reducibility of both metal and support at low temperature, strong metal support interaction and small Ni particle size are important factors for low-temperature CO methanation.

New Ni-based quaternary disk-shaped catalysts for low-temperature CO methanation: Fabrication, characterization, and performance.

Ni-based quaternary disk catalysts were manufactured for low-temperature CO methanation reactions, and the reaction activity was examined with respect to the thermal treatment conditions. By applying varying reduction and combustion treatments, the same catalysts were compared, and the Ni oxidation conditions and physical features were confirmed through X-Ray diffraction, scanning electron microscopy, and energy dispersive X-ray analyses. In addition, oxygen adsorption/desorption changes were measured by temperature-programmed reduction after pre-treating with oxygen and hydrogen.