Ceria-based catalysts doped with manganese and copper were obtained via the hydrothermal synthesis. Four systems were synthesized: CeO2 (pure ceria), Ce0.95Mn0.05 (Mn/Ce at. ratio = 1/19), Ce0.95Cu0.05 (Cu/Ce at. ratio = 1/19) and Ce0.95Mn0.025Cu0.025 (Mn/Cu/Ce at. ratio = 1/1/38). The catalytic activity of the prepared materials was tested for the CO and soot oxidations. Complementary techniques (XRD, N-2 physisorption at - 196 degrees C, FESEM, XPS, Raman spectroscopy, CO-TPR and Soot-TPR) were performed to investigate their physico-chemical properties. The samples were characterized by nanocubes, in the case of CeO2, and by nanopolyhedra for binary (Ce0.95Mn0.05 and Ce0.95Cu0.05) and ternary oxides (Ce0.95Mn0.025Cu0.025). The CO-TPR analysis has confirmed that the reducibility follows the order: CeO2 < Ce0.95Mn0.05 < Ce0.95Mn0.025Cu0.025 < Ce0.95Cu0.05. A similar trend appears for the surface defective sites (Raman spectroscopy). These findings suggest the beneficial role of dopants in improving the structural defects and the surface reducibility of ceria. Both properties promote the CO oxidation activity. In fact, the Ce0.95Cu0.05 was the most effective catalyst for the CO oxidation. The Ce0.95Mn0.05 sample exhibited the best performance in soot oxidation. The following order was achieved: Ce0.95Mn0.025Cu0.025 < Ce0.95Cu0.05 < CeO2 approximate to Ce0.95Mn0.05, in agreement with the reduction profiles obtained by the Soot-TPR above 400 degrees C.
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Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing, Peoples R ChinaTsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing, Peoples R China
Gong, Ming
Zhang, Jian
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Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing, Peoples R ChinaTsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing, Peoples R China
Zhang, Jian
Luo, Jing-Li
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Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB, CanadaTsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing, Peoples R China
Luo, Jing-Li
Wang, Chang-An
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Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing, Peoples R ChinaTsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing, Peoples R China
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Riga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, LatviaRiga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, Latvia
Sile, Elina
Chornaja, Svetlana
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Riga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, LatviaRiga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, Latvia
Chornaja, Svetlana
Serga, Vera
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Riga Tech Univ, Inst Inorgan Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, LatviaRiga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, Latvia
Serga, Vera
Lulle, Ilze
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Riga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, LatviaRiga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, Latvia
Lulle, Ilze
Zhizhkuna, Svetlana
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Riga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, LatviaRiga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, Latvia
Zhizhkuna, Svetlana
Dubencov, Konstantin
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Riga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, LatviaRiga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, Latvia
Dubencov, Konstantin
Krumina, Aija
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Riga Tech Univ, Inst Inorgan Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, LatviaRiga Tech Univ, Inst Appl Chem, Fac Mat Sci & Appl Chem, Paula Valdena St 3, LV-1048 Riga, Latvia