Microstructure and oxygen evolution of Fe-Ce mixed oxides by redox treatment

作者：Li, Kongzhai; Haneda, Masaaki; Ning, Peihong; Wang, Hua; Ozawa, Masakuni^*

来源：Applied Surface Science, 2014, 289: 378-383.

DOI：10.1016/j.apsusc.2013.10.170

• Fe-Ce mixed oxides
• Solid solution
• Reducibility
• Fe2O3
• Interface
• Redox
• Oxygen storage capacity

The relationship between structure and reduction/redox properties of Fe-Ce mixed oxides with a Fe content of 5, 10, 20 or 30 mol%, prepared by a coprecipitation method, were investigated by XRD, Raman, TEM, TPR and TPO techniques. It is found that all the iron ions can be incorporated into the ceria lattice to form a solid solution for the FeCe 5 (Fe 5%) sample, but amorphous or crystal Fe2O3 particles were found to be present on the Fe-Ce oxide samples with higher the iron content. The reducibility of single solid solution was much better than the pure CeO2, and the appearance of dispersed Fe-2 O-3 particles improved the surface reducibility of materials. The iron ions incorporated into the CeO2 lattice accelerated the oxygen release from bulk to surface, and surface Fe-2 O-3 particles in close contact to CeO2 acted as a catalyst for the reaction between solid solution and hydrogen. The microstructure of exposed Fe2O3 with Ce-Fe-O solid solution allows the Fe-Ce mixed oxides to own good reducibility and high OSC, which also counteracts the deactivation of the reducibility resulting from the sintering of materials in the redox cycling.

• 出版日期2014-1-15
• 单位昆明理工大学