Catalytic combustion of methane over La2BCoO6 perovskites containing Ni, Cu and Fe: impact of B-sites on oxygen species and catalytic activity

Reaction Kinetics, Mechanisms and Catalysis - Tập 131 - Trang 737-752 - 2020
H. Rezaei Shadegan1, S. Maghsoodi1, B. Ghanavati1, A. Shahbazi Kootenaei1, A. Azimi1
1Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran

Tóm tắt

The effect of B-site partial substitution on the structure and the catalytic performance of cobalt-based double perovskites (La2BCoO6 where B = Cu, Ni and Fe) was investigated in the catalytic combustion of methane. The synthesized samples were characterized using XRD, XRF, N2-physisorption, H2-TPR, O2-TPD, CH4-TPR and XPS techniques. The XRD results showed the successful synthesis of cobalt-based double perovskites with single phase and rhombohedral structure. The incorporation of Ni, Cu and Fe created abundant oxygen vacancies on the double perovskites which improved oxygen mobility and reducibility and accordingly increased the catalytic activity. The catalytic activity of synthesized samples was in the order of La2CuCoO6 > La2NiCoO6 > La2FeCoO6 > LaCoO3. The better activity of La2CuCoO6 was owing to the presence of the highest oxygen species, the highest reducibility and the highest oxygen mobility.

Tài liệu tham khảo

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