Novel Mn-Cu-Containing CeO2 Nanopolyhedra for the Oxidation of CO and Diesel Soot: Effect of Dopants on the Nanostructure and Catalytic Activity

被引:49
|
作者
Dosa, Melodj [1 ,2 ]
Piumetti, Marco [1 ,2 ]
Bensaid, Samir [1 ,2 ]
Andana, Tahrizi [1 ,2 ]
Novara, Chiara [1 ,2 ]
Giorgis, Fabrizio [1 ,2 ]
Fino, Debora [1 ,2 ]
Russo, Nunzio [1 ,2 ]
机构
[1] Politecn Torino, Corso Duca Abruzzi,24, I-10128 Turin, Italy
[2] Politecn Torino, Dept Appl Sci & Technol, Corso Duca Abruzzi 24, I-10129 Turin, Italy
关键词
Nanostructured ceria; CO oxidation; Soot oxidation; Manganese-ceria; Copper-ceria; MIXED-OXIDE CATALYSTS; OXYGEN STORAGE; CALCINATION TEMPERATURE; CUO/CEO2; CATALYSTS; RAMAN-SPECTROSCOPY; TRANSITION-METAL; CARBON-MONOXIDE; NOBLE-METAL; CERIA; NANOPARTICLES;
D O I
10.1007/s10562-017-2226-y
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:298 / 311
页数:14
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