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Size-controllable monodisperse chromic oxide multihole microsphere constructed by similarly cubic nano units and preparation method of microsphere

A technology of porous microspheres and cubes, applied in the direction of chromium oxide/hydrate, etc., can solve the problems of narrow controllable range of microsphere diameter, poor monodispersity, complex process, etc., and achieve easy mastery, easy operation and good repeatability Effect

Inactive Publication Date: 2012-07-25
哈尔滨中汇达信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems that existing methods for preparing chromium oxide microspheres have complex processes, most of the building units are spherical particles, the diameter of the prepared microspheres is narrow in the controllable range, the monodispersity is poor, and the pore size is small, and a cubic nanometer-like Preparation method of monodisperse chromium oxide porous microspheres with controllable size of unit construction

Method used

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  • Size-controllable monodisperse chromic oxide multihole microsphere constructed by similarly cubic nano units and preparation method of microsphere
  • Size-controllable monodisperse chromic oxide multihole microsphere constructed by similarly cubic nano units and preparation method of microsphere
  • Size-controllable monodisperse chromic oxide multihole microsphere constructed by similarly cubic nano units and preparation method of microsphere

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specific Embodiment approach 1

[0034] Specific Embodiment 1: The size-controllable monodisperse chromium oxide porous microspheres constructed by cubic-like nano-units in this embodiment are three-dimensional structured microspheres constructed by three-dimensional cubic-like units. The side length is 40-80nm, the diameter of the accumulation hole is 20-80nm, and the diameter of the microsphere is 200nm-6μm.

[0035] In this embodiment, the three-dimensional structure microspheres constructed by the three-dimensional cube-like units have relatively small cube-like unit particles (about 40-80 nm), and the three-dimensional structure microspheres constructed have cube-packed pores with relatively large pore diameters (the pore size distribution is 20-80 nm). 80nm), so the surface activity of the material is strong, and these characteristics make it have application prospects in the fields of gas sensors, lithium-ion battery electrode materials, electrochemistry, catalysis, and chemical adsorption.

specific Embodiment approach 2

[0036] Specific embodiment two: the preparation method of the size-controllable monodisperse chromium oxide porous microspheres constructed by the quasi-cubic nano-units in this embodiment is carried out according to the following steps:

[0037] 1. Weigh chromium acetylacetonate, NH 4 HCO 3 crystals and absolute ethanol;

[0038] 2. The NH that was weighed in step 1 4 HCO 3 The crystals are laid flat on the bottom of the polytetrafluoroethylene reactor, and the chromium acetylacetonate weighed in step 1 is dissolved in the absolute ethanol weighed in step 1, stirred evenly and then transferred to the polytetrafluoroethylene reactor, After reacting at 250°C for 2 hours, cool to room temperature, centrifuge the contents of the reaction kettle, wash the obtained precipitate three times with deionized water, and then wash three times with absolute ethanol, and dry at a temperature of 60-80°C for 8 hours, the precursor microspheres were obtained;

[0039] 3. Calcining the pre...

specific Embodiment approach 3

[0041] Specific embodiment three: the difference between this embodiment and specific embodiment two is that in step one, chromium acetylacetonate, NH 4 HCO 3 crystals and absolute ethanol. Others are the same as in the second embodiment.

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Abstract

The invention discloses a size-controllable monodisperse chromic oxide multihole microsphere constructed by similarly cubic nano units and a preparation method of the microsphere, and relates to the preparation method of the chromic oxide multihole microsphere. The invention aims to problems of complicated process, low product monodispersity and small aperture existed in the conventional chromic oxide microsphere preparation method. The chromic oxide multihole microsphere is constructed by the similarly cubic units and provided with accumulation holes. The preparation method for the chromic oxide multihole microsphere comprises the following steps of 1, weighing chromium acetylacetonate, ammonium bicarbonate crystal and absolute ethyl alcohol; 2, flatly paving the ammonium bicarbonate at the bottom of a reaction kettle, dissolving the chromium acetylacetonate in the absolute ethyl alcohol, stirring and transferring to the kettle, reacting at the temperature of 250 DEG C, cooling to room temperature, performing centrifugal separation, and washing and drying the obtained sediments to obtain a precursor microsphere; and 3, calcining the precursor microsphere at the temperature within 300-600 DEG C for 2 hours, and thus obtaining the monodisperse chromic oxide multihole microsphere. The process is simple; the size of the obtained product is controllable; the monodispersity is high; and the size-controllable monodisperse chromic oxide multihole microsphere can be used in the fields of gas sensitivity, lithium batteries, catalysis and the like.

Description

technical field [0001] The invention relates to a preparation method of chromium oxide porous microspheres. Background technique [0002] At present, the research on the preparation of three-dimensional oxide microspheres mainly focuses on ZnO, TiO 2 , Fe 2 o 3 , MnO 2 and Co 3 o 4 and other traditional semiconductor materials. There are few reports on the study of pure phase chromium oxide microspheres, especially the synthesis method of microspheres constructed of cubic nanounits with controllable size. At present, there are template methods for preparing chromium oxide microspheres, such as chromium oxide microspheres prepared by using yeast as a template, or by high-temperature solvothermal method. However, these preparation methods have the disadvantages of complicated process, mostly spherical particles, narrow controllable range of diameter of prepared microspheres, poor monodispersity, and small pore size. Contents of the invention [0003] The present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/02
Inventor 徐英明霍丽华马骅程晓丽高山赵辉
Owner 哈尔滨中汇达信息科技有限公司