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Gamma-aluminium oxide nanometer material and preparation method of nickel/gamma-aluminium oxide catalyst

A kind of aluminum oxide nano-technology, applied in the direction of alumina/aluminum hydroxide, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of strict preparation process, decreased catalyst activity, Catalyst clogging and other problems, to achieve the effect of low price, high specific surface area, and low equipment requirements

Active Publication Date: 2015-06-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the preparation of nano-alumina in China mainly stays in the laboratory stage, and industrial production has not yet been realized in China. One of the main reasons is that the particle size distribution of nano-alumina obtained by most preparation methods is relatively wide, and the preparation process is strict. Poor repeatability, cannot be widely used
In addition, when used as a carrier, nano-alumina has the problem of reduced catalytic activity at high temperatures
This is because at high temperature, due to the reduction of the surface area of ​​nano-alumina and the shrinkage of the pore volume, the supported catalyst is blocked and falls off, resulting in a decrease in the activity of the catalyst.

Method used

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  • Gamma-aluminium oxide nanometer material and preparation method of nickel/gamma-aluminium oxide catalyst

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Embodiment 1

[0039] (1) Synthesis of γ-alumina nanomaterials

[0040] At room temperature, add 0.8000g of alum and 0.4000g of urea to 25ml of deionized water, add a magnetic stirrer and stir for 10 minutes to completely dissolve the solid; transfer the solution to a 50ml reaction kettle, and perform a hydrothermal reaction at 180°C. The reaction time was 15 hours. After the hydrothermal reaction was completed and cooled down to room temperature, the reacted product was taken out, the precipitate was centrifuged, washed alternately with absolute ethanol and deionized water, and vacuum-dried at 60°C to obtain an AlOOH precursor. The AlOOH precursor is placed in a corundum porcelain boat and calcined in air to 800°C for 5 hours to obtain γ-alumina nanomaterials.

[0041] (2) Preparation of nickel / γ-alumina catalyst

[0042] 1.075g of prepared γ-alumina nanomaterials were impregnated in 100ml of 0.1M Ni(NO 3 ) 2 ·6H 2 O solution, stirred magnetically at room temperature until the solvent ...

Embodiment 2

[0052] (1) Synthesis of γ-alumina nanomaterials

[0053] At room temperature, add 0.8000g of alum and 0.1012g of urea into 25ml of deionized water, add a magnetic stirrer and stir for 10 minutes to completely dissolve the solid; transfer the solution to a 50ml reaction kettle, and perform a hydrothermal reaction at 180°C. The reaction time was 15 hours. After the hydrothermal reaction was completed and cooled down to room temperature, the reacted product was taken out, the precipitate was centrifuged, washed alternately with absolute ethanol and deionized water, and vacuum-dried at 60°C to obtain an AlOOH precursor. The AlOOH precursor is placed in a corundum porcelain boat and calcined in air to 800°C for 5 hours to obtain γ-alumina nanomaterials.

[0054] (2) Preparation of nickel / γ-alumina catalyst

[0055] 0.510g of prepared γ-alumina nanomaterials were impregnated in 100ml of 0.1M Ni(NO 3 ) 2 ·6H 2 O solution, stirred magnetically at room temperature until the solven...

Embodiment 3

[0057] (1) Synthesis of γ-alumina nanomaterials

[0058] At room temperature, add 0.8000g of alum and 0.8101g of urea to 25ml of deionized water, add a magnetic stirrer and stir for 10 minutes to completely dissolve the solid; transfer the solution to a 50ml reaction kettle, and perform a hydrothermal reaction at 180°C. The reaction time was 15 hours. After the hydrothermal reaction was completed and cooled down to room temperature, the reacted product was taken out, the precipitate was centrifuged, washed alternately with absolute ethanol and deionized water, and vacuum-dried at 60°C to obtain an AlOOH precursor. The AlOOH precursor is placed in a corundum porcelain boat and calcined in air to 800°C for 5 hours to obtain γ-alumina nanomaterials.

[0059] (2) Preparation of nickel / γ-alumina catalyst

[0060] 5.098g of prepared γ-alumina nanomaterials were impregnated in 100ml of 0.1M Ni(NO 3 ) 2 ·6H 2 O solution, stirred magnetically at room temperature until the solvent ...

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Abstract

The invention discloses a synthesis method for a gamma-aluminium oxide nanometer material. The synthesis method comprises the following steps: at room temperature, adding alum and carbamide into deionized water, cooling, centrifugating and washing the sediment after the hydrothermal reaction; calcining the dried hydrothermal products to obtain the gamma-aluminium oxide nanometer material. The gamma-aluminium oxide nanometer material prepared by adopting the synthesis method has a relatively high specific surface area and a certain pore structure. The invention further provides a method for prepare a nickel / gamma-aluminium oxide catalyst by adopting the gamma-aluminium oxide nanometer material obtained by adopting the synthesis method as the raw material. The method comprises the following steps: impregnating the gamma-aluminium oxide nanometer material into a nickel salt solution in the appropriate concentration, carrying out magnetic stirring till the solvent evaporates; collecting the dried impregnating products and grinding into powders, and carrying out heating reduction in the reducing atmosphere to obtain the nickel / gamma-aluminium oxide catalyst. The catalyst can be used for catalyzing the methane dry-process reforming reaction, has a relatively high methane conversion rate, and can still maintain excellent stability and carbon formation resistance in the long-term catalytic reaction under high temperature.

Description

technical field [0001] The invention relates to the preparation of inorganic nanometer materials, in particular to the synthesis of a gamma-alumina nanometer material and a method for preparing a nickel / gamma-alumina catalyst using the material as a raw material. Background technique [0002] Nano-alumina is widely used in various fields due to its nano-effects such as surface effect, quantum effect and volume effect. Due to its small size, nano-alumina has a high proportion of surface atoms and a large specific surface area. The high specific surface area and high surface energy brought about by incomplete coordination of atoms lead to an increase in surface active sites, and it is easy to adsorb gases or react with surrounding gases. Secondly, with the decrease of particle size, the surface smoothness of nano-alumina becomes worse, forming uneven atomic steps, which increases the contact surface of chemical reactions, therefore, the catalytic activity and selectivity of na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B01J23/755
Inventor 高濂张晴张鹏刘静宋雪峰
Owner SHANGHAI JIAO TONG UNIV
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