Effects of loading transition metal(Mn,Cr,Fe,Cu) oxides on oxygen storage/release properties of CeO_2-ZrO_2 solid solution |
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| Affiliation: | 1. Institute of New Energy and Low-Carbon Technology, Chengdu 610064, China;2. College of Chemistry, Sichuan University, Sichuan, Chengdu 610064, China;3. Polymer Research Institute of Sichuan University, Sichuan University, Chengdu 610065, China;1. Department of Chemistry, FFCLRP, University of São Paulo, 14040-901 Ribeirão Preto, São Paulo, Brazil;2. Institute of Chemistry, Rio de Janeiro State University, 20550-900 Rio de Janeiro, Rio de Janeiro, Brazil;3. Institute of Chemistry, University of Campinas, 13083-970 Campinas, São Paulo, Brazil;4. Center of Natural and Human Sciences, Federal Univerty of ABC, 09210-580, Santo André, São Paulo, Brazil |
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| Abstract: | Cerium zirconium-based (CZ) oxygen storage materials (OSMs) play a crucial role in three-way catalysts (TWCs), while CZ needs to be modified to satisfy more rigorous emission standard. In this study, transition metal (TMs = Mn, Cr, Fe, Cu) oxides modified CZ were prepared by incipient wetness impregnation method to improve the oxygen storage capacity of CZ-based materials. To clearly illustrate the influence of TM oxides, N2 adsorption-desorption, X-ray diffraction (XRD), oxygen storage capacity (OSC), temperature programmed reduction by H2 (H2-TPR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the physical and chemical properties of samples. It is found that, all modified CZ have higher OSC, lower reduction temperatures than those of pristine CZ. Interaction between TMOs and CZ take precedence over specific surface to influence OSC. Notably, FeOx/CZ has the highest OSC, which is about 1.9 times that of CZ and it could be attributed to synergistic effect between FeOx and CZ; CuOx/CZ has the lowest reduction temperature which is 168°C lower than that of CZ, and it can be explained by hydrogen spillover effect. |
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| Keywords: | Transition metals Ceria-Zirconia Incipient wetness impregnation OSC |
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