Exclusively selective oxidation of toluene to benzaldehyde on ceria nanocubes by molecular oxygen

Lv, Jiangang; Shen, Yi; Peng, Luming; Guo, Xuefeng; Ding, Weiping

doi:10.1039/c0cc00777c

Cited by 105 publications

(61 citation statements)

References 27 publications

(21 reference statements)

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“…Moreover, shuttleshaped particles composed of closely packed ceria nanorods displayed higher activity for CO oxidation compared to ceria nanorods [34], which has been attributed to enhanced porosity, surface area and oxygen deficiency of these nanoshapes compared to ceria rods. Ceria nanocubes on the other hand displayed greater activity compared to nanoparticles of irregular morphology in selective oxidation of toluene and benzene oxidation [35]. Pure and supported ceria nanocubes exhibited twice higher activity in oxidation of hydrogen and ethanol compared to rods and particles [36,37].…”

Section: Introductionmentioning

confidence: 96%

Effects of Morphology of Cerium Oxide Catalysts for Reverse Water Gas Shift Reaction

et al. 2016

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Reverse water gas shift reaction (RWGS) was investigated over cerium oxide catalysts of distinct morphologies: cubes, rods and particles. Catalysts were characterized by X-ray diffraction, Raman spectroscopy and temperature programmed reduction (TPR) in hydrogen. Nanoshapes with high concentration of oxygen vacancies contain less surface oxygen removable in TPR. Cerium oxide cubes exhibited two times higher activity per surface area as compared to rods and particles. Catalytic activity of these nanoshapes in RWGS reaction exhibited a relation with the lattice microstrain increase, however a causal relationship remained unclear. Results presented in this study suggest that superior catalytic activity of ceria cubes in RWGS originates from the greater inherent reactivity of (100) crystal planes enclosing cubes, contrary to less inherently reactive (111) facets exposed at rods and particles.Graphical Abstract

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Section: Introductionmentioning

confidence: 96%

Effects of Morphology of Cerium Oxide Catalysts for Reverse Water Gas Shift Reaction

et al. 2016

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“…In addition, ceria nanomaterials also exhibit excellent catalytic properties in redox organic reaction. Lv et al [210] reported that CeO 2 nanocube with exposed (100) facets showed exclusive selectivity for the oxidation of toluene to benzaldehydes in liquid phase by O 2 . CeO 2 nanoplates prepared by Zhang et al can selectively catalyze the reduction of nitro-aromatic compounds [211,212].…”

Section: Catalysis Of Organic Chemistry Reactionsmentioning

confidence: 98%

Rare Earth Based Anisotropic Nanomaterials: Synthesis, Assembly, and Applications

Yan

Sun

Zhang

et al. 2015

Anisotropic Nanomaterials

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Rare earths (RE) refer to the lanthanide elements La-Lu together with Sc and Y. Conventionally, they have found applications in phosphors, magnets, catalysts, fuel cell electrodes/electrolyte. Here in this chapter, we discuss the synthesis, assembly and applications of rare earth based anisotropic nanomaterials. Regarding synthesis, the anisotropic growth behaviors of these nanocrystals are predominantly governed by their own unique crystal structures. Yet for wet-chemistry synthetic methods where a number of parameters could be finely tuned, the addition of particular coordination agents, templating agents or mineralizers has proven to be an effective way to direct the growth of nanocrystals into some anisotropic structures. Regarding applications, anisotropic nanomaterials, compared to their isotropic counterparts, often exhibit distinct properties. For example, the luminescence of anisotropic nanomaterials can display polarization and site-specific features. As for rare earth nanomaterials as magnetic resonance imaging (MRI) contrast agents, the high surface area of anisotropic nanostructures can give rise to superior performances. And for catalysis applications, anisotropic nanomaterials expose rich, highly active facets, which is of great importance for facet-selective catalytic reactions. In the chapter, we will start with introduction of the crystal structures of rare earth compounds, then briefly summarize the synthesis and assembly of rare earth anisotropic nanomaterials, and discuss their properties and applications in three realms, namely, luminescence, magnetism and catalysis.

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“…The primary synthesis strategy is hydrothermal and/or solvothermal processes. 286,290,[292][293][294][295][296][297][298][299][300] Among them, a facile alkali-assisted hydrothermal process produced CeO 2 nanocubes of 20-50 nm (Figure 10.27), 280 and the sizes of the cubes could be further tailored in a wide range of 20-360 nm by simply adjusting the synthetic parameters. 293 But these cubes are too large to demonstrate appreciable effect in catalytic reactions.…”

Section: Ceo 2 -Np and Nanocubesmentioning

confidence: 99%

“…For example, ceria nanocubes with uniform sizes of about 5 nm and 10 nm were prepared using oleic acid as the structure-directing agent. 286,296,298 Recently, single-crystalline ceria nanocubes of about 10 nm with (100) facets were fabricated using a supercritical hydrothermal process. 299 This cubic nanostructure had surprisingly high extra-low-temperature OSC, demonstrating the potential to be a superior catalyst.…”

Section: Ceo 2 -Np and Nanocubesmentioning

confidence: 99%

Tuning the Morphology of Metal Oxides for Catalytic Applications

Shen

2013

Nanocatalysis Synthesis and Applications

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Exclusively selective oxidation of toluene to benzaldehyde on ceria nanocubes by molecular oxygen

Abstract: Well-defined ceria nanocubes covered by oleic acid with exposed {100} facets have been synthesized and exhibited exclusive selectivity for the oxidation of toluene to benzaldehydes in liquid phase by O(2).

Cited by 105 publications

References 27 publications

Effects of Morphology of Cerium Oxide Catalysts for Reverse Water Gas Shift Reaction

Effects of Morphology of Cerium Oxide Catalysts for Reverse Water Gas Shift Reaction

Rare Earth Based Anisotropic Nanomaterials: Synthesis, Assembly, and Applications

Tuning the Morphology of Metal Oxides for Catalytic Applications

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