Synthesis and properties of spherical catalysts TiO2-SiO2/МхOy (M = Co and Cr)

Rogacheva, A. O.; Shamsutdinova, A. N.; Brichkov, Anton S.; Larina, T. V.; Paukshtis, E. A.; Козик, В. В.

doi:10.1063/1.5009832

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Hollow spheres of metal oxides are intensively investigated for applications, such as controlled release capsules for drugs, fillers, filters [1], gas sensitive materials [1,2], absorbents and separation materials, especially for fixed-bed reactors or chromatography columns [3]. In recent years, hollow spheres of metal oxides have also been intensively investigated for applications as catalysts [3][4][5][6][7]. This is because metal oxide with hollow micro and nanospheres only has low density and good porous structure (usually contain both mesopores and macropores [3]), but also provides a high surface area with more active acid-base oxide centers on the pore surface [4].…”

Section: Introductionmentioning

confidence: 99%

“…This method was used for the first time for preparing plutonium oxide microspheres as early as 1989 [9]. Later it was successfully applied to obtain spherical particles of Fe 2 O 3 [3,10], porous Al 2 O 3 , TiO 2 [3] and ZrO 2 /Al 2 O 3 macrobeads [4], MoO 3 microspheres [1] and TiO 2 -SiO 2 /M x O y (M = Co, Cr) [6] and MoO 3 -TiO 2 -SiO 2 composites [5]. Resins with various compositions and structures were used in these studies.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Кузнецова¹,

Khalipova²,

Lisitsa³

et al. 2021

Nanosystems: Phys. Chem. Math.

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The aim of this work was to synthesize of nanostructured MoO 3 /TiO 2 -SiO 2 composites with hollow spherical shape by thermal decomposition of anion exchangers saturated with Mo 7 O 6− 24 ions and treated with the TBT-TEOS sol. The effect of the kinetics (Kissinger and the Metzger-Horowitz methods) of thermal decomposition of resins of porous and gel structures on the size of MoO 3 nanoparticles and the strength of MoO 3 /TiO 2 -SiO 2 spheres was shown. The formation of dense spherical nanostructured agglomerates of the composite is facilitated by reactions occurring at the interface between the phases of cylindrical and spherical symmetry when using an anion exchange resin with a porous structure. The decomposition reactions of the anion-exchange resin of the gel structure, accompanied by random nucleation, lead to the formation of hollow spherical agglomerates of the composite with cracks on the surface. The materials were characterized by DSC-TGA, XRD and SEM.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Кузнецова¹,

Khalipova²,

Lisitsa³

et al. 2021

Nanosystems: Phys. Chem. Math.

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“…and ZrO 2 /Al 2 O 3 macrobeads, 3 MoO 3 microspheres 4 and TiO 2 -SiO 2 /M x O y (M = Co, Cr) 9 and MoO 3 -TiO 2 -SiO 2 composites. 5 Resins with various compositions and structures were used in these studies.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of MoO₃/TiO₂‐SiO₂ with hollow spherical shape using resin as the template: Effect of decomposition of resins

Кузнецова

Khalipova

Lisitsa

et al. 2021

J of Applied Polymer Sci

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Anion exchange resins are widely used in template synthesis of oxide composites. The present work is aimed to study the thermal destruction of anion exchangers with divinyl-benzene and polyacrylate matrices in order to obtain hollow spherical MoO 3 /TiO 2 -SiO 2 composites from these resins preliminarily saturated with paramolybate ion and coated with tetrabutoxytitanium sol with tetroethoxysilane. It is shown that the processes of resins decomposition affect the strength of spherical composites. Decomposition of the resin with a polyacrylate matrix, accompanied by random nucleation and burnout of the organic matrix at 350 C, leads to the formation of spherical oxide composites with cracks on the surface. The decomposition reactions of the resin with a divinylbenzene matrix occurring at the boundaries of the phases of cylindrical and spherical symmetry, as well as a lower burnout temperature of the organic matrix (290 C), contribute to the formation of dense MoO 3 /TiO 2 -SiO 2 spheres. Hollow spherical composites 0.3-0.5 mm in size are orthorhombic α-MoO 3 coated with a mixture of titanium dioxide with anatase structure and amorphous silicon dioxide.

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“…Using the example of metal oxide composites of YBa 2 Cu 3 O 7−δ and TiO 2 -SiO 2 composites production in works [18][19][20], it was shown that ion exchange resins could act as a template. Earlier [5,21], it was indicated that ion exchange resins could be used as a template for the preparation of catalytically active oxide composites TiO 2 −SiO 2 /Cr 2 O 3 and TiO 2 −SiO 2 /Co 3 O 4 with a spherical shape of aglomerates.…”

mentioning

confidence: 99%

“…This may be due to the fact that the TOKEM-250 cation exchanger used as an organic matrix was used in sodium form and as a result of sorption, not all sodium ions were replaced by chromium (III) ions. According to researches of such systems [5,21,23] and based on XRD data and micro-X-ray spectral analysis, we assume that the samples obtained are oxides TiO 2 and Cr 2 O 3 .…”

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confidence: 99%

Production of TiO2/Cr2O3 Composite Material in the Spherical Form

et al. 2019

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Spherical TiO2/Cr2O3 oxides composites were obtained by template method accompanied with sol-gel method. Ion exchange resins of spherical form (TOKEM-100 and TOKEM-250) were used as an organic polymer matrix. Thermal analysis, X-ray phase analysis and micro-X-ray spectral analysis were used to identify the formation process and compositions of oxides composites. The formation of spherical oxide composite ends at 400 °C and the final products are a mixture of two oxides: Cr2O3 and TiO2 regardless of the structure of the used template. According SEM data prepared TiO2/Cr2O3 composites have spherical form and the size of sphere found to be in a range from 300 to 870 µm.

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Synthesis and properties of spherical catalysts TiO2-SiO2/МхOy (M = Co and Cr)

Cited by 7 publications

References 9 publications

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Fabrication of MoO₃/TiO₂‐SiO₂ with hollow spherical shape using resin as the template: Effect of decomposition of resins

Production of TiO2/Cr2O3 Composite Material in the Spherical Form

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Synthesis and properties of spherical catalysts TiO2-SiO2/МхOy (M = Co and Cr)

Cited by 7 publications

References 9 publications

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Fabrication of MoO3/TiO2‐SiO2 with hollow spherical shape using resin as the template: Effect of decomposition of resins

Production of TiO2/Cr2O3 Composite Material in the Spherical Form

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Fabrication of MoO₃/TiO₂‐SiO₂ with hollow spherical shape using resin as the template: Effect of decomposition of resins