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Effects of calcination temperatures on the structure–activity relationship of Ni–La/Al(2)O(3) catalysts for syngas methanation

A series of Ni–La/Al(2)O(3) 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), N(2) adsorption–desorption, H(2) temperature-programmed reduction (H(2)-TPR...

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Detalles Bibliográficos
Autores principales: Wu, Hongli, Zou, Meng, Guo, Lisheng, Ma, Fengyun, Mo, Wenlong, Yu, Yuming, Mian, Inamullah, Liu, Jingmei, Yin, Shuangjie, Tsubaki, Noritatsu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9048969/
https://www.ncbi.nlm.nih.gov/pubmed/35492664
http://dx.doi.org/10.1039/c9ra09674d
Descripción
Sumario:A series of Ni–La/Al(2)O(3) 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), N(2) adsorption–desorption, H(2) temperature-programmed reduction (H(2)-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 Al(2)O(3). 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 H(2)-TPR. Cat-400 also achieved the highest CO conversion, CH(4) selectivity and yield. Cat-400 exhibited good stability and catalytic activity in a lifetime testing of 200 h. The deactivation of cat-400 was mainly caused by carbon deposition according to the data from XRD, TG-DTG and XPS.