Uniform formation of uranium oxide nanocrystals inside ordered mesoporous hosts and their potential applications as oxidative catalysts

Zhang, Z. T.; Konduru, Mahesh V.; Dai, Sheng; Overbury, Steven H.

doi:10.1039/b204987b

Cited by 39 publications

(27 citation statements)

References 20 publications

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“…Uranium chemistry represents a diverse field of chemistry [1][2][3][4] . Apart from the employment of large uranium complexes in nuclear waste reprocessing [5][6][7] and catalysis [8][9][10][11] , there exists a number of small uranium-containing compounds that exhibit peculiar and unusual features [12][13][14][15][16] . Examples are the notorious quintuple bond for the U 2 dimer 17 and the discovery of the unexpected complexation of uranium compounds by noble gases [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Unravelling the quantum-entanglement effect of noble gas coordination on the spin ground state of CUO

Tecmer

Boguslawski

Legeza

et al. 2014

Phys. Chem. Chem. Phys.

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The accurate description of the complexation of the CUO molecule by Ne and Ar noble gas matrices represents a challenging task for present-day quantum chemistry. Especially, the accurate prediction of the spin ground state of different CUO-noble-gas complexes remains elusive. In this work, the interaction of the CUO unit with the surrounding noble gas matrices is investigated in terms of complexation energies and dissected into its molecular orbital quantum entanglement patterns. Our analysis elucidates the anticipated singlet-triplet ground-state reversal of the CUO molecule diluted in different noble gas matrices and demonstrates that the strongest uranium-noble gas interaction is found for CUOAr4 in its triplet configuration.

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Section: Introductionmentioning

confidence: 99%

Unravelling the quantum-entanglement effect of noble gas coordination on the spin ground state of CUO

Tecmer

Boguslawski

Legeza

et al. 2014

Phys. Chem. Chem. Phys.

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“…[5] However, the composition and the phase could greatly influ-ence its catalytic performance. For instance, UO 2 is an active catalyst for the dehydration/dehydrogenation of ethanol, [6] while U 3 O 8 exhibits high oxidative activity for the destruction of volatile organic compounds, [7] and b-UO 3 is more active for the formation of furan from acetaldehyde. [8] Therefore, targeted synthesis of uranium oxides with specific compositions and phases is important for many related applications.…”

Section: Introductionmentioning

confidence: 99%

Template‐Free Synthesis and Mechanistic Study of Porous Three‐Dimensional Hierarchical Uranium‐Containing and Uranium Oxide Microspheres

Wang¹,

Zhao²,

Wang³

et al. 2014

Chemistry A European J

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A novel type of uranium-containing microspheres with an urchin-like hierarchical nano/microstructure has been successfully synthesized by a facile template-free hydrothermal method with uranyl nitrate hexahydrate, urea, and glycerol as the uranium source, precipitating agent, and shape-controlling agent, respectively. The as-synthesized microspheres were usually a few micrometers in size and porous inside, and their shells were composed of nanoscale rod-shaped crystals. The growth mechanism of the hydrothermal reaction was studied, revealing that temperature, ratios of reactants, solution pH, and reaction time were all critical for the growth. The mechanism study also revealed that an intermediate compound of 3 UO3 ⋅NH3 ⋅5 H2 O was first formed and then gradually converted into the final hydrothermal product. These uranium-containing microspheres were excellent precursors to synthesize porous uranium oxide microspheres. With a suitable calcination temperature, very uniform microspheres of uranium oxides (UO2+x , U3 O8 , and UO3 ) were successfully synthesized.

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“…In this context, actinide-based nanocrystals could be used as new building blocks for the preparation of innovative nuclear fuels [13] or for environmental purposes as model systems to study the migration of radioactive elements. [9] Finally, some actinide compounds are very efficient as heterogeneous catalysts [14] or could even be used in thermopower devices. [6] Herein, we report the controlled synthesis of thorium and uranium oxide nanocrystals by a non-aqueous approach.…”

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis of Thorium and Uranium Oxide Nanocrystals

Hudry

Apostolidis

Walter

et al. 2013

Chemistry A European J

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Very little is known about the size and shape effects on the properties of actinide compounds. As a consequence, the controlled synthesis of well-defined actinide-based nanocrystals constitutes a fundamental step before studying their corresponding properties. In this paper, we report on the non-aqueous surfactant-assisted synthesis of thorium and uranium oxide nanocrystals. The final characteristics of thorium and uranium oxide nanocrystals can be easily tuned by controlling a few experimental parameters such as the nature of the actinide precursor and the composition of the organic system (e.g., the chemical nature of the surfactants and their relative concentrations). Additionally, the influence of these parameters on the outcome of the synthesis is highly dependent on the nature of the actinide element (thorium versus uranium). By using optimised experimental conditions, monodisperse isotropic uranium oxide nanocrystals with different sizes (4.5 and 10.7 nm) as well as branched nanocrystals (overall size ca. 5 nm), nanodots (ca. 4 nm) and nanorods (with ultra-small diameters of 1 nm) of thorium oxide were synthesised.

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Uniform formation of uranium oxide nanocrystals inside ordered mesoporous hosts and their potential applications as oxidative catalysts

Cited by 39 publications

References 20 publications

Unravelling the quantum-entanglement effect of noble gas coordination on the spin ground state of CUO

Unravelling the quantum-entanglement effect of noble gas coordination on the spin ground state of CUO

Template‐Free Synthesis and Mechanistic Study of Porous Three‐Dimensional Hierarchical Uranium‐Containing and Uranium Oxide Microspheres

Controlled Synthesis of Thorium and Uranium Oxide Nanocrystals

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