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Method for preparing gamma-AlOOH, gamma-Al2O3 nano rods/boards

A nano-rod and nano-plate technology, applied in the direction of alumina/aluminum hydroxide, can solve problems such as incomplete understanding, and achieve the effects of good shape controllability, wide application prospect and simple process

Active Publication Date: 2010-07-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there have been many reports on directional aggregation, the growth mechanism, especially the directional aggregation in the absence of organic additives, is still not fully understood.

Method used

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  • Method for preparing gamma-AlOOH, gamma-Al2O3 nano rods/boards
  • Method for preparing gamma-AlOOH, gamma-Al2O3 nano rods/boards
  • Method for preparing gamma-AlOOH, gamma-Al2O3 nano rods/boards

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1.γ-AlOOH nanorods, γ-Al 2 o 3 Preparation of nanorods

[0031] Mix 170g of γ-AlOOH nanopowder with a diameter of less than 5nm and 830mL of deionized water, disperse evenly with a colloid mill to obtain a suspension with a solid content of 17%, and add 0.5mol / L sulfuric acid solution under high-speed stirring at 3000r / min Adjust its pH value to 2 to obtain a precursor slurry. The obtained precursor slurry was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, and the reaction kettle was sealed and heated to 240°C at a heating rate of 5°C / min, and kept for 17 hours. After the reaction kettle naturally dropped to room temperature, centrifuged The product was isolated, washed with deionized water, and dried at 100° C. to obtain γ-AlOOH nanorods with a length of 200-400 nm and a diameter of 10-12 nm. The XRD spectrum, TEM photo and HR-TEM photo of the resulting product are shown in Figure 1-3 .

[0032] Alternatively, proceed...

Embodiment 2

[0035] As in the method of Example 1, the difference is that it was incubated at 240° C. for 24 hours. The obtained γ-AlOOH nanorods are 300-400nm long and 10-12nm in diameter; the obtained γ-Al 2 o 3 The nanorods are 300-400nm long and 10-12nm in diameter.

Embodiment 3

[0037] Mix 35g of γ-AlOOH nanopowder with a diameter of less than 5nm and 165mL of deionized water, and disperse evenly with a high-speed mixer to obtain a suspension with a solid content of 17.5%. Under the high-speed stirring condition of 3000r / min, add 0.8mol / L sulfuric acid solution Adjust its pH value to 2 to obtain a precursor slurry. The obtained precursor slurry was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, and the reaction kettle was sealed and heated to 240°C at a heating rate of 6°C / min, and kept for 72 hours. After the reaction kettle naturally dropped to room temperature, centrifuged The product was isolated, washed with deionized water, and dried at 90° C. to obtain γ-AlOOH nanorods with a length of 300-2000 nm and a diameter of 10-15 nm.

[0038] Alternatively, proceed to the following steps to prepare γ-Al 2 o 3 Nano stave:

[0039] Put the obtained nanorod product into a muffle furnace at room temperature, raise th...

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Abstract

The invention relates to a method for preparing gamma-AlOOH, gamma-Al2O3 nano rods / boards, comprising the following steps: taking gamma-AlOOH nanoparticles as a raw material, preparing serum with evenly dispersed gamma-AlOOH nanoparticles, respectively regulating the pH value by sulfuric acid or nitric acid solution, heating precursor serum in a reaction kettle to 180-270 DEG C, preserving the temperature for 16-72h to obtain the gamma-AlOOH nano rods / boards, and further calcining the gamma-AlOOH nano rods / boards at the temperature of 450-850 DEG C to obtain the gamma-Al2O3 nano rods / boards with unchanged appearance. The method of the invention has simple process and can be used in large-scale production, the prepared gamma-AlOOH and gamma-Al2O3 are in a similar single-crystal structure with uniform appearance, and the prepared nano rod / board products can be used in technical fields such as catalysis, abrasive, ceramics and the like.

Description

technical field [0001] The present invention relates to a kind of γ-AlOOH, γ-Al 2 o 3 The invention relates to a preparation method of nanorods / plates, belonging to the field of inorganic non-metallic materials. Background technique [0002] For a long time, the application of alumina in many fields such as adsorbents, composite materials, ceramics, catalysts and catalyst supports has received extensive attention. Compared with bulk materials, nanostructured alumina materials have the advantages of high elastic modulus, good thermal and chemical stability, unique optical properties, high specific surface area and high catalytic activity, and are one of the research hotspots in the field of materials. Boehmite phase γ-AlOOH is an important precursor for the preparation of alumina, from γ-AlOOH to γ-Al 2 o 3 The phase transformation process of γ-AlOOH can maintain its original size and shape, so a lot of research work has focused on the conversion of γ-AlOOH to γ-Al 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 陈代荣张立焦秀玲夏玉国
Owner SHANDONG UNIV
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