Catalytic performance of cerium iron complex oxides for partial oxidation of methane to synthesis gas

• Published in: Journal of rare earths Vol. 26; no. 5; pp. 705 - 710
• Main Author: 李孔斋 王华 魏永刚 刘明春
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2008; Faculty of Materials and Metallurgy Engineering,Kunming University of Science and Technology,Kunming 650093,China
• Subjects: cerium iron complex oxides; cycles; lattice oxygen; methane; rare earths; selective oxidation; syngas; 氧化物; 氧晶格; 铈离子; lattice oxygen; selective oxidation; methane; cerium iron complex oxides; syngas; cycles; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(08)60167-2

The cerium iron complex oxides oxygen carrier was prepared by the co-precipitation method. The reactions between methane and lattice oxygen from the complex oxides were investigated in a fixed micro-reactor system. The reduced oxygen carder could be re-oxidized by air and its initial state could be restored. The characterizations of the oxygen carders were studied using XRD, O2-TPD, and H2-TPR. The results showed that the bulk lattice oxygen of CeO2-Fe2O3 was found to be suitable for the partial oxidation of methane to synthesis gas. There were two kinds of oxygen species on the oxygen carrier： the stronger oxygen species that was responsible for the complete oxidation of methane, and the weaker oxygen species （bulk lattice oxygen） that was responsible for the selective oxidation of methane to CO and H2 at a higher temperature. Then, the lost bulk lattice oxygen could be selectively supplemented by air re-oxidation at an appropriate reaction condition. CeFeO3 appeared on the oxygen carrier after 10 successive redox cycles, however, it was not bad for the selectivity of CO and H2.