Preparation of ZrO2 and ZrO2/SiC powders by carbothermal reduction of ZrSiO4

Kljajević, Ljiljana; Matović, Branko; Radosavljević-Mihajlović, Ana; Rosić, Milena; Bošković, S.; Devečerski, Aleksandar

doi:10.1016/j.jallcom.2010.11.002

Cited by 38 publications

(11 citation statements)

References 31 publications

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“…Also the XRD patterns of Fe 3 O 4 @ZrO 2 and Fe 3 O 4 @ZrO 2 -Pr-SO 3 H are similar with XRD pattern for Fe 3 O4 30,31 as given inFig.2b and 2c. As well as XRD of the magnetic nanoparticles of Fe 3 O 4 in the cubic phase is a good agreement with (PDF no: 01-075-0499) as shown inFig.2a.…”

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confidence: 76%

Nanomagnetic zirconia-based sulfonic acid (Fe₃O₄@ZrO₂-Pr-SO₃H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions

2016

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In the present work, sulfonic acid functionalized nanomagnetic zirconia is prepared by the reaction of (3-mercaptopropyl)trimethoxysilane and nanomagnetic zirconia. Then, nanomagnetic zirconia-based sulfonic acid (Fe 3 O 4 @ZrO 2 -Pr-SO 3 H) is synthesized through direct oxidation of thiol group by hydrogen peroxide and H 2 SO 4 subsequently. The catalyst was charactrized by fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM) image, energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), measurement and vibrational sample magnetometry (VSM). It was used as an effective nanocatalyst with high catalytic activity for the protection of alcohols using hexamethyldisilazane (HMDS) under solvent-free conditions at room temperature. The solid nanocatalyst can easily be separated and reused several times without significant loss of its catalytic activity. Also, morethan inexpensive and simplicity of separation process, this heterogeneous catalyst has shown a good chemoselectivity in the reactions.

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confidence: 76%

Nanomagnetic zirconia-based sulfonic acid (Fe₃O₄@ZrO₂-Pr-SO₃H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions

2016

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“…The method used to produce different characteristics of zirconia powder is based on the desired product. The best result obtained for zirconia powder is using chemical routes, but it is not an economical method for industrial manufacturing compared to the conventional milling method [8]. However, the high-quality nanometer-sized powder is obtainable using the technology of precipitation.…”

Section: ■ Introductionmentioning

confidence: 99%

Study of the Synthesis of Zirconia Powder from Zircon Sand obtained from Zircon Minerals Malaysia by Caustic Fusion Method

et al. 2020

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The zircon powder from Zircon Minerals Malaysia is a pure premium grade zircon sand milled 1.5 µm that contain ZrSiO4, ZrO2, HfO2, SiO2, Al2O3, TiO2, and Fe2O3. The monoclinic zirconia powders were synthesized from the zircon sand of Zircon Minerals Malaysia, by caustic fusion method at calcination temperatures between 500 °C to 800 °C. The as-synthesized zirconia was characterized through X-Ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric and differential thermal analysis (TG-DTA), and X-Ray fluorescence (XRF) techniques. The XRD results show two monoclinic phases of microcrystalline zirconia. Zirconia that was calcined at 600 °C obtained the highest value of ZrO2, which was 54.48%; followed by zirconia calcined at 700 °C, 800 °C, and 500 °C, which obtained the ZrO2 values of 53.58%, 52.41%, and 51.53%, respectively, based on the XRF analysis. As-synthesized zirconia showed monoclinic phases where the surface areas were 0.0635 m2/g, 0.135 m2/g, 0.0268 m2/g, and 0.0288 m2/g, for zirconia calcined at temperatures of 500 °C, 600 °C, 700 °C, and 800 °C, respectively. The surface structure of the powder that had been calcined at 600 C showed similarities with the commercial zirconia. The similarities of the synthesized zirconia and commercial zirconia showed that the zirconia powder could be synthesized using zircon sand by caustic fusion method, even though the content of zirconia was lower compared to that of the commercial zirconia powder.

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“…Zircon (ZrSiO 4 ), a low-cost and high-abundance material, intended to decompose into highly active ZrO 2 and SiO 2 in situ, has been proved to be favorable for enhancing the synthetic reactions of ZrB 2 -SiC powders [10,11]. Moreover, the theoretical phase composition of the final product, resulting from ZrSiO 4 , was ZrB 2 -26 wt % SiC, which was among the as-reported optimal composition range for the preparation of the bulk counterpart, with promising mechanical properties and oxidation resistance [12,13].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

et al. 2018

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To address the various shortcomings of a high material cost, energy-intensive temperature conditions and ultra-low efficiency of the conventional boro/carbothermal reduction method for the industrial preparation of ZrB2-SiC powders, a novel molten-salt and microwave-modified boro/carbothermal reduction method (MSM-BCTR) was developed to synthesize ZrB2-SiC powders. As a result, phase pure ZrB2-SiC powders can be obtained by firing low-cost zircon (ZrSiO4), amorphous carbon (C), and boron carbide (B4C) at a reduced temperature of 1200 °C for only 20 min. Such processing conditions are remarkably milder than not only that required for conventional boro/carbothermal reduction method to prepare phase pure ZrB2 or ZrB2-SiC powders (firing temperature of above 1500 °C and dwelling time of at least several hours), but also that even with costly active metals (e.g., Mg and Al). More importantly, the as-obtained ZrB2 particles had a single crystalline nature and well-defined plate-like morphology, which is believed to be favorable for enhancing the mechanical properties, especially toughness of their bulk counterpart. The achievement of a highly-efficient preparation of such high-quality ZrB2-SiC powders at a reduced temperature should be mainly attributed to the specific molten-salt and microwave-modified boro/carbothermal reduction method.

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Preparation of ZrO2 and ZrO2/SiC powders by carbothermal reduction of ZrSiO4

Cited by 38 publications

References 31 publications

Nanomagnetic zirconia-based sulfonic acid (Fe₃O₄@ZrO₂-Pr-SO₃H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions

Nanomagnetic zirconia-based sulfonic acid (Fe₃O₄@ZrO₂-Pr-SO₃H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions

Study of the Synthesis of Zirconia Powder from Zircon Sand obtained from Zircon Minerals Malaysia by Caustic Fusion Method

Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

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Preparation of ZrO2 and ZrO2/SiC powders by carbothermal reduction of ZrSiO4

Cited by 38 publications

References 31 publications

Nanomagnetic zirconia-based sulfonic acid (Fe3O4@ZrO2-Pr-SO3H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions

Nanomagnetic zirconia-based sulfonic acid (Fe3O4@ZrO2-Pr-SO3H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions

Study of the Synthesis of Zirconia Powder from Zircon Sand obtained from Zircon Minerals Malaysia by Caustic Fusion Method

Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

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Nanomagnetic zirconia-based sulfonic acid (Fe₃O₄@ZrO₂-Pr-SO₃H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions

Nanomagnetic zirconia-based sulfonic acid (Fe₃O₄@ZrO₂-Pr-SO₃H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions