Comparing thermal and mechanochemical decomposition of ammonium paratungstate (APT)

Marashi, Maryam Sadat; Khaki, Jalil Vahdati; Zebarjad, Seyed Mojtaba

doi:10.1016/j.ijrmhm.2011.08.004

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…Simultaneously, crystallization of tungsten trioxide WO 3 is represented by the exothermic peak in the DSC curve. The same range of temperature for WO 3 crystallization was also reported by Marashi et al37 for paratungstate thermal decomposition.…”

Section: Resultssupporting

confidence: 83%

Niobium–Containing Lindqvist Isopolyanions [Nb_xW_6–xO₁₉]^(2+x)– Used as Precursors for Hydrodesulfurization Catalysts with Isomerization Properties

et al. 2015

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Lindqvist isopolyanions [NbxW6–xO19](2+x)– (x = 0–4 and 6) were prepared and their spectroscopic and thermal properties were determined by Raman and IR spectroscopy as well as TGA/DSC. The structure of the [NbW5O19]3– anion obtained as single crystal was determined. Ni‐promoted alumina‐supported hydrodesulfurization (HDS) catalysts were prepared from the best soluble NbW polyoxometalates. In the calcined catalysts, better dispersion of the metallic species is observed when using NbW isopolyanions instead of the conventional ammonium metatungstate. The presence of niobium was expected to introduce acidity leading to isomerization property in classical NiW HDS catalysts. In HDS reaction conditions (under hydrogen pressure and sulfided environment) the cyclohexane isomerization into methylcyclopentane activity of niobium‐based catalysts was found up to 5 times superior to that of conventional NiW catalyst, showing the beneficial effect of niobium for this reaction.

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Section: Resultssupporting

confidence: 83%

Niobium–Containing Lindqvist Isopolyanions [Nb_xW_6–xO₁₉]^(2+x)– Used as Precursors for Hydrodesulfurization Catalysts with Isomerization Properties

et al. 2015

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“…In addition, two exothermic peaks are observed at 355 and 440 °C. The peak at 440 °C can be attributed to crystallization of the amorphous phase of WO3 [22]. In this study, calcination temperatures higher than 600 °C were chosen to prepare WO3, which facilitated a high degree of crystallinity.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a monoclinic/hexagonal junction in WO3 and its enhanced photocatalytic degradation of rhodamine B

Liu

Zhang

et al. 2016

Chinese Journal of Catalysis

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“…Solid-phase methods are based mainly on two approaches: tribochemical [91] and thermal [92] decompositions; the latter allows the production of a pure, surfactant-free, well-crystallized material without harmful impurities. For example, ammonium meta-and paratungstate are readily decomposed under heating, to form tungsten trioxide [93][94][95][96][97][98][99][100][101][102].…”

Section: Introductionmentioning

confidence: 99%

Highly Crystalline WO₃ Nanoparticles Are Nontoxic to Stem Cells and Cancer Cells

Han

Попов

Шекунова

et al. 2019

Journal of Nanomaterials

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Tungsten oxide sol, containing highly crystalline nanoparticles of orthorhombic WO3 and having good sedimentation stability, was synthesized using a facile, ultrasonic-assisted technique. An additional steric stabilizer, dextran, was proposed to enhance the stability of WO3 nanoparticles in biological media and to reduce their in vivo toxicity. The cytotoxicity of dextran-stabilized and nonstabilized WO3 sols was studied in vitro using dental pulp stem (DPS) cell lines and breast cancer (MCF-7) cell lines. Both tungsten oxide sols demonstrated low cytotoxicity and low genotoxicity for both stem cells and malignant cells and only slightly reduced their metabolic activity in the concentration range studied (from 0.2 to 200 μg/ml). The data obtained support possible theranostic applications of tungsten oxide colloidal solutions.

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Comparing thermal and mechanochemical decomposition of ammonium paratungstate (APT)

Cited by 11 publications

References 14 publications

Niobium–Containing Lindqvist Isopolyanions [Nb_xW_6–xO₁₉]^(2+x)– Used as Precursors for Hydrodesulfurization Catalysts with Isomerization Properties

Niobium–Containing Lindqvist Isopolyanions [Nb_xW_6–xO₁₉]^(2+x)– Used as Precursors for Hydrodesulfurization Catalysts with Isomerization Properties

Fabrication of a monoclinic/hexagonal junction in WO3 and its enhanced photocatalytic degradation of rhodamine B

Highly Crystalline WO₃ Nanoparticles Are Nontoxic to Stem Cells and Cancer Cells

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Comparing thermal and mechanochemical decomposition of ammonium paratungstate (APT)

Cited by 11 publications

References 14 publications

Niobium–Containing Lindqvist Isopolyanions [NbxW6–xO19](2+x)– Used as Precursors for Hydrodesulfurization Catalysts with Isomerization Properties

Niobium–Containing Lindqvist Isopolyanions [NbxW6–xO19](2+x)– Used as Precursors for Hydrodesulfurization Catalysts with Isomerization Properties

Fabrication of a monoclinic/hexagonal junction in WO3 and its enhanced photocatalytic degradation of rhodamine B

Highly Crystalline WO3 Nanoparticles Are Nontoxic to Stem Cells and Cancer Cells

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Product

Resources

About

Niobium–Containing Lindqvist Isopolyanions [Nb_xW_6–xO₁₉]^(2+x)– Used as Precursors for Hydrodesulfurization Catalysts with Isomerization Properties

Niobium–Containing Lindqvist Isopolyanions [Nb_xW_6–xO₁₉]^(2+x)– Used as Precursors for Hydrodesulfurization Catalysts with Isomerization Properties

Highly Crystalline WO₃ Nanoparticles Are Nontoxic to Stem Cells and Cancer Cells