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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. 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.

SUBMITTER: Wu H 

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

REPOSITORIES: biostudies-literature

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Effects of calcination temperatures on the structure-activity relationship of Ni-La/Al<sub>2</sub>O<sub>3</sub> catalysts for syngas methanation.

Wu Hongli H   Zou Meng M   Guo Lisheng L   Ma Fengyun F   Mo Wenlong W   Yu Yuming Y   Mian Inamullah I   Liu Jingmei J   Yin Shuangjie S   Tsubaki Noritatsu N  

RSC advances 20200127 7

A series of Ni-La/Al<sub>2</sub>O<sub>3</sub> 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<sub>2</sub> adsorption-desorption, H<sub>2</sub> temperature-programmed reduction (H<sub>2</sub>-TPR), and X-ray photoelectron spectroscopy (XPS). The calcination temperatures (350-700 °C) had significant impacts on the crystallite sizes and interactions  ...[more]

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