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Preparation method of aluminium oxide material

A technology of alumina and inorganic aluminum salts, applied in chemical instruments and methods, alumina/aluminum hydroxide, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of catalyst carrier specific surface area reduction and service life Shortening, catalytic activity decline and other problems, to achieve the effect of material morphology and structure adjustable, good thermal stability, high catalytic activity

Active Publication Date: 2013-07-31
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These reactions often require higher temperatures, and high temperature conditions will cause γ-Al 2 o 3 thermodynamically stable α-Al 2 o 3 transformation, resulting in a sharp decrease in the specific surface area of ​​the catalyst carrier, and the aggregation of active components on the load, resulting in a decrease in catalytic activity and a shortened service life

Method used

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  • Preparation method of aluminium oxide material
  • Preparation method of aluminium oxide material
  • Preparation method of aluminium oxide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] First, dissolve 8.1g of aluminum nitrate in 35ml of water, add 0.3g of lysine after dissolving, and stir to obtain a colorless and transparent solution, then add 11.5g of urea, and after the system is stable, transfer the above reaction solution to a 50ml hydrothermal kettle In 100 °C oven, hydrothermal reaction was carried out for 12 hours, and after centrifugal washing to neutrality, the product was dried in an oven at 80 °C overnight. The obtained white precipitate was calcined in a muffle furnace at 300°C for 2h at a heating rate of 1°C / min to obtain rod-shaped alumina. Its scanning transmission electron microscope as figure 1 As shown, the nitrogen adsorption test results show that the specific surface area is about 820m 2 g -1 , the pore volume is about 0.488m 3 g -1 .

Embodiment 2

[0040] First, dissolve 0.75g of aluminum nitrate in 100ml of water, add 0.3g of lysine after dissolving to obtain a colorless and transparent solution, then add 1g of urea under stirring conditions, and transfer the above reaction solution to 150ml of water In a hot kettle, hydrothermally react in an oven at 100°C for 12 hours, and after being centrifuged and washed to neutral, the product is dried in an oven at 80°C overnight. The obtained white precipitate is calcined in a muffle furnace at 500°C for 2 hours, and the heating rate is 1°C / min, and aloe-like alumina can be obtained. Its scanning electron microscope as figure 2 As shown, the nitrogen adsorption test results show that the specific surface area is about 216m 2 g -1 , the pore volume is about 0.311m 3 g -1 .

Embodiment 3

[0042] First, dissolve 0.75g of aluminum nitrate in 100ml of water, then add 1g of urea under stirring conditions, and after the system is stable, transfer the above reaction solution to a 150ml hydrothermal kettle, and perform a hydrothermal reaction in an oven at 100°C for 12 hours, then wash by centrifugation After reaching neutrality, the product was dried overnight in an oven at 80°C. The obtained white precipitate was calcined in a muffle furnace at 500°C for 2h at a heating rate of 1°C / min to obtain flaky alumina. Its scanning electron microscope as image 3 As shown, the nitrogen adsorption test results show that the specific surface area is about 222m 2 g -1 , the pore volume is about 0.339m 3 g -1 .

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Abstract

The invention relates to an aluminium oxide material and a preparation method as well as application thereof. The preparation method comprises a hydro-thermal reaction step in which an inorganic aluminium salt, urea and a structure-directing agent are used as raw materials and water is used as solvent, wherein the molar ratio of the structure-directing agent to Al<3>+ is (0-4):1, and the molar ratio of the urea to the Al<3+> is (3-12):1. The aluminium oxide material which takes the shape of flakes, aloe, spindle, rod and the like can be prepared by adjusting conditions such as the variety andthe concentration and the like of reactants; and the specific surface of the prepared aluminium oxide material can be controlled in a range of 190-820m<2> / g. A supported type nanometer noble metal catalyst prepared by using aluminium oxide as a carrier has good thermal stability and high catalytic activity. The aluminium oxide synthesized by the invention has the advantages of simple process, adjustable appearance and structure of materials, and high technical additional value and is suitable for fields such as the synthesis and adsorption separation of the supported type catalyst and the like.

Description

technical field [0001] The invention relates to a method for synthesizing a novel alumina material with controllable appearance and structure, and the application of the alumina material in preparing a practical nanometer precious metal catalyst. Background technique [0002] Alumina is an important catalyst carrier and adsorbent because of its advantages such as large specific surface area, high mechanical strength, and good thermal stability, and is widely used in industry. At present, the production methods of alumina in industry are mainly alkaline method, acid method, acid-base combined method and thermal method. [0003] Alkali method is to use alkali (NaOH or Na 2 CO 3 ) to process the bauxite, so that the alumina hydrate in the ore reacts with the alkali to form a sodium aluminate solution. Impurities such as iron and titanium in bauxite and most of the silica become insoluble matter and enter the solid residue, which is called red mud. After the sodium aluminate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B01D53/92B01J35/10B01J23/52B01J23/42B01J23/44B01J23/50B01J23/46B01J23/755B01J20/08B01J20/30
Inventor 陆安慧李文翠
Owner DALIAN UNIV OF TECH