Layer stephanoporate gamma-aluminum oxide and preparation method and application thereof

A hierarchical porous alumina technology, applied in the preparation of alumina/hydroxide, alumina/aluminum hydroxide, nanostructure manufacturing, etc., can solve the problems of low purity and high cost of hierarchical porous γ-alumina

Inactive Publication Date: 2008-03-12
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of hierarchical porous γ-alumina by the above methods requires the use of artificial templates with high cost, and the prepared hierarchical porous γ-alumina has low purity
Moreover, so far, no one has synthesized hierarchically porous γ-alumina via the route of infiltration of inorganic precursors into plant templates.

Method used

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  • Layer stephanoporate gamma-aluminum oxide and preparation method and application thereof
  • Layer stephanoporate gamma-aluminum oxide and preparation method and application thereof
  • Layer stephanoporate gamma-aluminum oxide and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Take the stem of the wild plant Pueraria lobata as a template, peel it and cut it into slices; put the slices of Pueraria rhizome into 2.6 mol / liter nitric acid aqueous solution for 24 hours, and then wash it repeatedly with distilled water until the pH value of the washing solution is close to 7 , dried under vacuum at room temperature. The slices of the dried Pueraria rhizome were put into the aluminum chloride solution with a concentration of 1 mol / liter, soaked for about 70 minutes, then taken out and placed in the air for 6 hours. Put the kudzu rhizome slices loaded with the aluminum chloride solution into ammonia gas for about 3 hours and then dry them thoroughly at 50 degrees Celsius. Finally, it was calcined at 800°C for 4 hours, and the obtained white hierarchical porous γ-alumina sheet was shown in Figure 1 .

[0038] Figures 1a and 1b are the photographs and low-magnification scanning electron microscope images of cross-sections of Pueraria rhizomes treated ...

Embodiment 2

[0043] The hierarchical porous gamma-alumina sheet prepared according to Example 1 was immersed in 0.001 mol / liter of chloroplatinic acid solution for 10 minutes, then washed with absolute ethanol, and then immersed in an excess of 0.1 mol / liter of sodium borohydride The solution was reduced for 10 minutes, and then washed with distilled water. After vacuum drying, in situ supported reduced platinum nanoparticles were obtained on γ-alumina, and the results are shown in Fig. 5 . Figure 5 is a transmission electron microscope image of alumina loaded with platinum nanoparticles in situ. As indicated by the arrows in the figure, the white spots are alumina nanopores, the slightly darker gray part is the alumina support, and the darker spots all over the alumina are platinum nanoparticles.

Embodiment 3

[0045] Take 5 parts of hierarchical porous γ-alumina with in-situ loading of platinum nanoparticles in Example 2, 1 part of which is not annealed, and the other 4 parts are put into a tubular resistance furnace. , 700, 800 degrees Celsius annealing for 30 minutes. The layered porous γ-alumina loaded with platinum nanoparticles without annealing and annealed at 400, 600, 700, and 800 degrees Celsius were respectively ground into fine powder, and prepared into a turbid solution of absolute ethanol. Then transfer a small amount of turbid liquid to the copper grid used for the transmission electron microscope to carry the sample. After vacuum drying, observe on the transmission electron microscope. changes in temperature. From the observation results of the transmission electron microscope, the diameters of hundreds of platinum nanoparticles were counted, and it was concluded that the γ-alumina on the γ-alumina without annealing (at about 20 degrees Celsius) and at 400, 600, 700,...

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Abstract

The present invention belongs to the technical field of nano material preparation, in particular to a stratum porous gamma-alumina and the preparation method of the stratum porous gamma-alumina. The present invention selects a cheap and easily acquired natural plant gegen as a template which is pre-treated by nitric acid and then soaked by alchlor solution, smoked and dipped by ammonia and roasted by high temperature to acquire the stratum porous gamma-alumina similar to the pore canal structure of the gegen. The preparation method has the advantages of no surfactant, easy preparation technics, low cost and high purity of the alumina prepared. Compared with the traditional gamma-alumina, the stratum porous gamma-alumina prepared by the present invention not only has abundant meso-pores, but also has abundant big pores, larger specific surface area and pore capability as well as good pore structure and thermal stability. As a carrier, the present invention has important values on the aspects of catalyzing, absorption, nano reactor, template and optical control device.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a hierarchical porous gamma-alumina and its preparation method and application. Background technique [0002] According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), porous materials can be divided into three categories according to their pore size: microporous materials with a pore size less than 2 nm, and mesoporous materials with a pore size between 2 and 50 nm. Between micropores and macropores is called mesoporous), and those with a pore diameter greater than 50nm are macroporous materials. [0003] Small pores mean a large specific surface area, which is conducive to the initial activity of the catalyst and to accommodate more metals; but it is not conducive to the diffusion of metals and organic compounds into the pores, which may easily cause pore blockage. In contrast, catalysts with larger pores have lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/30B82B1/00B82B3/00
Inventor 贺军辉曹阳李成章
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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