Catalytic Oxidation of CO and Soot over Ce-Zr-Pr Mixed Oxides Synthesized in a Multi-Inlet Vortex Reactor: Effect of Structural Defects on the Catalytic Activity

被引:34
作者
Bensaid, Samir [1 ]
Piumetti, Marco [1 ]
Novara, Chiara [1 ]
Giorgis, Fabrizio [1 ]
Chiodoni, Angelica [2 ]
Russo, Nunzio [1 ]
Fino, Debora [1 ]
机构
[1] Politecn Torino, Dept Appl Sci & Technol, Corso Duca Abruzzi 24, I-10129 Turin, Italy
[2] Ist Italiano Tecnol, Ctr Sustainable Futures CSF POLITO, Corso Trento 21, I-10129 Turin, Italy
来源
NANOSCALE RESEARCH LETTERS | 2016年 / 11卷
关键词
Ceria; Zirconia; Praseodymia; Dopants; Structural defects; CO oxidation; Soot oxidation; NANOPARTICLE PRECIPITATION; CERIA; COMBUSTION; SENSITIVITY; SIMULATION; NANORODS; INSIGHTS; RAMAN;
D O I
10.1186/s11671-016-1713-1
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In the present work, ceria, ceria-zirconia (Ce = 80 at.%, Zr = 20 at.%), ceria praseodymia (Ce = 80 at.%, Pr = 20 at.%) and ceria-zirconia-praseodymia catalysts (Ce = 80 at.%, Zr = 10 at.% and Pr = 10 at.%) have been prepared by the multi-inlet vortex reactor (MIVR). For each set of samples, two inlet flow rates have been used during the synthesis (namely, 2 ml min(-1), and 20 ml min-1) in order to obtain different particle sizes. Catalytic activity of the prepared materials has been investigated for CO and soot oxidation reactions. As a result, when the catalysts exhibit similar crystallite sizes (in the 7.7-8.8 nm range), it is possible to observe a direct correlation between the O-gamma/F-2g vibrational band intensity ratios and the catalytic performance for the CO oxidation. This means that structural (superficial) defects play a key role for this process. The incorporation of Zr and Pr species into the ceria lattice increases the population of structural defects, as measured by Raman spectroscopy, according to the order: CeO2<Ce80Zr20<Ce80Zr10Pr10<Ce80Pr20. On the other hand, the presence of zirconium and praseodymium into the ceria lattice does not have a direct beneficial effect on the soot oxidation activity for these catalysts, in contrast with nanostructured ones (e.g., Ce-Zr-O nanopolyhedra, Ce-Pr-O nanocubes) described elsewhere (Andana et al. Appl. Catal. B 197: 125-137, 2016; Piumetti et al., Appl Catal B 180: 271-282, 2016).
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页数:14
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