Effects of calcination temperatures on the structure-activity relationship of Ni-La/Al₂O₃ catalysts for syngas methanation.

ABSTRACT: A series of Ni-La/Al₂O₃ catalysts for the syngas methanation reaction were prepared by a mechanochemical method and characterized by thermogravimetric analysis (TG-DTA), X-ray fluorescence (XRF), X-ray diffraction (XRD), N₂ adsorption-desorption, H₂ temperature-programmed reduction (H₂-TPR), and X-ray photoelectron spectroscopy (XPS). The calcination temperatures (350-700 °C) had significant impacts on the crystallite sizes and interactions between NiO and Al₂O₃. The catalyst calcined at 400 °C (cat-400) showed a 12.1% Ni dispersion degree and the maximum bound state of NiO (54%) through the Gaussian fitting of H₂-TPR. Cat-400 also achieved the highest CO conversion, CH₄ selectivity and yield

SUBMITTER: Wu H 

PROVIDER: S-EPMC9048969 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature