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Alpha-TeO2 of micro structure and production method and application thereof

A microstructure, resulting technology, applied in the preparation of organic compounds, preparation of carboxylates, chemical instruments and methods, etc.

Inactive Publication Date: 2012-06-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

No chemical method has been used to prepare morphology-controlled α-TeO from cheap and easy-to-obtain raw materials. 2 report

Method used

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  • Alpha-TeO2 of micro structure and production method and application thereof
  • Alpha-TeO2 of micro structure and production method and application thereof
  • Alpha-TeO2 of micro structure and production method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 0.5g NaOH and 1gβ-TeO 2 Mix, add 10ml distilled water, stir to form a white suspension, add 1g NH 4 NO 3 Finally, 63ml of water was added in total, and the mixture was transferred to a polytetrafluoro-lined stainless steel hydrothermal kettle with a hydrothermal temperature of 175°C and a hydrothermal time of 72h. The product was separated by centrifugation, washed with water and dried at 100°C for 12 hours. The resulting α-TeO 2 The product contains micron-scale columnar crystals, and there are also crystal clusters formed by the accumulation of submicron-scale small wafers, see the attached figure 2 .

Embodiment 2

[0025] Weigh 1.0g NaOH and 1gβ-TeO 2 Mix, add 20ml distilled water, stir to form a suspension, add 1.5g NH 4 NO 3 , and finally add 105ml of water in total, and transfer the mixture to a polytetrafluoro-lined stainless steel hydrothermal kettle with a hydrothermal temperature of 175°C and a hydrothermal time of 72h. The product was separated by centrifugation, washed with water and dried at 100°C for 12 hours. The resulting α-TeO 2 The product is composed of a large number of submicron-sized dense small wafers piled up into large spherical clusters and some small spheres, see the attached image 3 .

Embodiment 3

[0027] Weigh 0.5g NaOH and 1gβ-TeO 2 Mix, add 10ml distilled water, stir to form a suspension, add 1.5g NH 4 NO 3 Finally, 75ml of water was added in total, and the mixture was transferred to a polytetrafluoro-lined stainless steel hydrothermal kettle with a hydrothermal temperature of 175°C and a hydrothermal time of 96h. The product was separated by centrifugation, washed with water and dried at 100°C for 12 hours. The resulting α-TeO 2 The product consists of many submicron-sized dense small wafers stacked into large spherical crystal clusters, occasionally with a small amount of micron-sized spheres, see the attached Figure 4 .

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Abstract

The invention relates to alpha-TeO2 of a micro structure, which is of an alpha-TeO2 material with the thickness of 0.5 to 1 micrometer, the width of 3 to 5 micrometer and close-packed small wafers. The alpha-TeO2 is made by adopting Beta-TeO2 as the raw material to be hydrothermal treated in the water solution of NaOH and NH4NO3. The alpha-TeO2 of the micro structure can be used as an excellent tellurium-source to prepare combined metal oxide catalyst. The invention discloses a production method of alpha-TeO2.

Description

technical field [0001] The present invention relates to microstructured α-TeO 2 And preparation method and use. technical background [0002] α-TeO 2 It has strong refraction, piezoelectricity and excellent acousto-optic properties [see Physical Review B 5 (1972) 4087], and has important applications in the fields of science and engineering. However, there are fewer chemical methods, most of which are physical methods such as laser evaporation [see J.Mater.Sci.32 (1997) 6595 and Inorganic Chemistry Communications 7 (2004) 179] and physical deposition methods [see Cryst.Res. Prepared by Technol.40 (2005) 1023]. The more common chemical preparation method is to take tellurium isopropoxide (IV) as raw material, the gel-sol method in alcoholic solution, but involves many steps, needs to strictly control the fast hydrolysis rate of tellurium isopropoxide [see J . Non-Cry. Solids 345-346 (2004) 634 and Mater. Lett. 59 (2005) 2379]. No chemical method has been used to prepare ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04B01J27/057C07C57/05C07C51/215
Inventor 季伟捷杨秀娟章伟锋
Owner NANJING UNIV
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