Characterization and Preparation of CexPr1-xO2-δ Mixed Oxides and the Catalytic Activity for CO and CH4

Abstract

Abstract: A series of Ce_xPr_1-xO_2-δ mixed oxides were synthesized by the sol-gel method and characterized by Raman and XRD techniques. The results show that when x value is changed from 1.0 to 0.5, only a cubic
phase CeO₂ appears. The samples are very well crystallized on decreasing x from 0.50 to 0.99. It can be explained to form an ordered array of O vacancies caused by the insertion of Pr atom completely
into the CeO₂ crystal lattice. For Ce_xPr_1-xO_2-δ samples 465cm^-1 and 1150cm^-1 Raman peaks are attributed to the Raman active F_2g mode of CeO₂. The broad peak at
about 570cm^-1 in the region 0.3≤x≤ 0.99 can be linked to lattice defects resulting in oxygen vacancies. The new band at about ^195cm-1 may be attributed to the asymmetric vibration that is caused
by the formation of oxygen vacancies. TPR profiles of Pr₆O₁₁ and CeO₂ have two reduction peaks respectively. The reduction process of Pr₆O₁₁is: PrO_1.83→PrO_1.61→PrO_1.5;
For CeO₂, the peak of low temperature attributed to the reduction of the surface cmoxygen of CeO₂, the peak of high temperature
attributed to the reduction of bulk CeO₂. The reduction peak temperature of Ce_xPr_1-xO_2-δ mixed oxides is lower than that of Pr₆O₁₁ and CeO₂, which indicates that the formation
of Ce_xPr_1-xO_2-δ solid solutions improves the reduction-oxidation behavior. The activity of Ce_xPr_1-xO_2-δ for CO oxidation indicates that the existing of the oxygen vacancies
favors CO oxidation; while the activity of CH₄ oxidation is related to the temperature and the area of the reduction-oxidation peak.

Key words: Ce_xPr_1-xO_2-δ mixed oxides, XRD, Raman, CO, CH₄, oxidation

CLC Number:

O643

YAN Zong-Lan,LIN Xia,LUO Jian-Hai,XIE Guan-Qun,LUO Meng-Fei. Characterization and Preparation of Ce_xPr_1-xO_2-δ Mixed Oxides and the Catalytic Activity for CO and CH₄[J]. Journal of Inorganic Materials.

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Characterization and Preparation of Ce_xPr_1-xO_2-δ Mixed Oxides and the Catalytic Activity for CO and CH₄

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