Ordering of Cu(II) ions in supported copper-titanium oxide catalysts

Altynnikov, A. A.; Цикоза, Л. Т.; Anufrienko, V. F.

doi:10.1007/s10947-006-0439-9

Cited by 12 publications

(13 citation statements)

References 11 publications

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“…Thus, this EPR signal originates from the Cu-related surface entities. The similar broad signal was observed in Cu-doped TiO 2 , 36 nonstoichiometric CuO, 37 Cu contained glasses 38 or solutions. 39 In Ref.…”

Section: Discussionsupporting

confidence: 76%

“…It was shown that in this case the parameters of EPR signal (g-factor, hyperfine coupling and anisotropy) depend on the structure of complex and the type of ligands. 36,39 The formation of surface complexes or CuO is supported by the appearance of the Raman peak at ∼280 cm −1 (not shown) that could be related to CuO 40 or cuprates. Such transformations of EPR and Raman scattering spectra can be explained by the outward diffusion of Cu atoms from nanocrystal volume to its surface.…”

Section: Discussionmentioning

confidence: 92%

“…39 In Ref. 36 this signal was ascribed to Cu-related surface complexes. It was shown that in this case the parameters of EPR signal (g-factor, hyperfine coupling and anisotropy) depend on the structure of complex and the type of ligands.…”

Section: Discussionmentioning

confidence: 98%

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Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

Korsunska

Baran

Polishchuk

et al. 2015

ECS J. Solid State Sci. Technol.

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The effect of both CuO content (1 and 8 mol%) and calcination temperature (T c = 500-1000 • C) on light emitting and structural properties of ZrO 2 -Y 2 O 3 -CuO nanopowders was studied by photoluminescence (PL), X-ray diffraction (XRD) and Raman scattering methods. The samples, calcinated at T c = 500-700 • C, contain the tetragonal ZrO 2 phase predominantly. The increase of T c results in its transformation to monoclinic one, and the phase transformation happens at higher temperature at higher Cu content. It is shown that the increase of T c from 500 to 800 • C results in the Cu incorporation into nanocrystals from the surface entities. This manifests itself in the shift of XRD and Raman peaks of tetragonal phase. The PL spectra demonstrate the presence of two main PL components peaked at about 540 nm and 630 nm in the most samples. The increase of T c from 500 to 1000 • C results in the non-monotonic variation of total PL intensity as well as in minor changes in PL spectra shape. The evolution of PL intensity is explained by both the increase of a crystallinity degree and the variation of the concentration of non-radiative recombination centres. The transformation of PL spectra shape is ascribed to the appearance of radiative Cu Zr centres.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 92%

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Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

Korsunska

Baran

Polishchuk

et al. 2015

ECS J. Solid State Sci. Technol.

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“…CuO is itself inactive for H 2 production from water or alcohol-water mixtures under UV or visible irradiation, since the conduction band of CuO is more positive than the H 2 O/H 2 redox potential [160–162]. Accordingly, the onset of the CuO nanoparticle formation should coincide with a decrease in the photocatalytic activity of CuO/TiO 2 photocatalysts for H 2 production, as the presence of inert CuO nanoparticles will reduce the number of surface sites on TiO 2 available for photoreactions [161, 162]. Experimental evidence to support this hypothesis is currently lacking, which motivates the present investigation.…”

Section: Tio2: As Support In Heterogeneous Catalysismentioning

confidence: 99%

“…For example, CuO has been deposited on TiO 2 nanotubes with Cu/Ti atom ratio of 10 and then evaluated by H 2 generation activity in methanol H 2 O mixtures under UV excitation. It is reported that the optimal CuO loading is around 1.3 wt%, giving the H 2 production rate of 2061 μ mol g −1 h −1 [161]. Meanwhile, the CuO/TiO 2 heterogeneous catalyst prepared by a complex precipitation method indicates the highest H 2 production observed in 10 wt% of the CuO loading [162].…”

Section: Tio2: As Support In Heterogeneous Catalysismentioning

confidence: 99%

Titanium Dioxide as a Catalyst Support in Heterogeneous Catalysis

Bagheri

Julkapli

Hamid

2014

The Scientific World Journal

333

176

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The lack of stability is a challenge for most heterogeneous catalysts. During operations, the agglomeration of particles may block the active sites of the catalyst, which is believed to contribute to its instability. Recently, titanium oxide (TiO 2 ) was introduced as an alternative support material for heterogeneous catalyst due to the effect of its high surface area stabilizing the catalysts in its mesoporous structure. TiO 2 supported metal catalysts have attracted interest due to TiO 2 nanoparticles high activity for various reduction and oxidation reactions at low pressures and temperatures. Furthermore, TiO 2 was found to be a good metal oxide catalyst support due to the strong metal support interaction, chemical stability, and acid-base property. The aforementioned properties make heterogeneous TiO 2 supported catalysts show a high potential in photocatalyst-related applications, electrodes for wet solar cells, synthesis of fine chemicals, and others. This review focuses on TiO 2 as a support material for heterogeneous catalysts and its potential applications.

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