Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

被引:73
作者
Lykaki, Maria [1 ]
Stefa, Sofia [1 ]
Carabineiro, Sonia A. C. [2 ]
Pandis, Pavlos K. [3 ]
Stathopoulos, Vassilis N. [3 ]
Konsolakis, Michalis [1 ]
机构
[1] Tech Univ Crete, Sch Prod Engn & Management, IEESL, GR-73100 Khania, Greece
[2] Univ Porto, Fac Engn, Lab Associado LSRE LCM, LCM, P-4200465 Porto, Portugal
[3] Univ Athens, Sch Sci, Gen Dept, Lab Chem & Mat Technol, Psachna Campus, GR-34400 Evia, Greece
来源
CATALYSTS | 2019年 / 9卷 / 04期
关键词
ceria morphology; facet dependence; Fe2O3; CeO2 mixed oxides; CO oxidation; FE MIXED OXIDES; CATALYTIC PERFORMANCE; SURFACE-CHEMISTRY; CEO2; NANOCRYSTALS; SOLID-SOLUTIONS; NANOPARTICLES; DECOMPOSITION; REDUCTION; SOOT; SUPPORT;
D O I
10.3390/catal9040371
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 has been widely studied either as catalyst itself or support of various active phases in many catalytic reactions, due to its unique redox and surface properties in conjunction to its lower cost, compared to noble metal-based catalytic systems. The rational design of catalytic materials, through appropriate tailoring of the particles' shape and size, in order to acquire highly efficient nanocatalysts, is of major significance. Iron is considered to be one of the cheapest transition metals while its interaction with ceria support and their shape-dependent catalytic activity has not been fully investigated. In this work, we report on ceria nanostructures morphological effects (cubes, polyhedra, rods) on the textural, structural, surface, redox properties and, consequently, on the CO oxidation performance of the iron-ceria mixed oxides (Fe2O3/CeO2). A full characterization study involving N-2 adsorption at -196 degrees C, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) was performed. The results clearly revealed the key role of support morphology on the physicochemical properties and the catalytic behavior of the iron-ceria binary system, with the rod-shaped sample exhibiting the highest catalytic performance, both in terms of conversion and specific activity, due to its improved reducibility and oxygen mobility, along with its abundance in Fe2+ species.
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页数:21
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