Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 43, Issue -, Pages 155-164Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2019.08.024
Keywords
CO2 methanation; Cerium; Perovskite-type oxide; Resistance to sintering; Nickel; Additive
Funding
- National Natural Science Foundation of China [21872101, 21576192]
- Natural Science Foundation of Tianjin [18JCZDJC31300]
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The key point in CO2 methanation is to improve the activity at low temperature and the stability. For this purpose, a new cerium-modified Ni-La2O3/ZrO2 catalyst was prepared using La1-xCexNiO3/ZrO2 with perovskite phase as the precursor, which was obtained by citrate complexation combined with an impregnation method. The resulting catalyst was characterized through Nitrogen adsorption and desorption, X-ray diffraction (XRD), Transmission electron microscopy (TEM), Hydrogen temperature programmed reduction (H-2-TPR), Temperature-programmed desorption of CO2(CO2-TPD) and that of H-2 (H-2-TPD), and X-ray photoelectron spectroscopy (XPS) techniques, and the catalytic performances for CO2 methanation was investigated. Cerium modification could improve the effective activation of CO2, thus enhancing the activity at low temperature for CO2 methanation. The metal Ni nanoparticles prepared using this method were highly dispersed and showed excellent resistance to sintering, leading to very good stability, which could be attributed to the following: Ni nanoparticles could be confined by cerium-modified La2O3; La2O3 could be confined by the cerium ions at the La2O3/ZrO2 interface; and the cerium ions were confined by ZrO2. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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