A kind of preparation method of leaf-shaped nanometer gamma-alumina

An alumina and blade-like technology, which is applied in the field of synthesis of nanometer γ-alumina carriers with high specific surface area, can solve the problem of high equipment requirements

Active Publication Date: 2018-06-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process requires processing of raw materials and requires high equipment

Method used

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  • A kind of preparation method of leaf-shaped nanometer gamma-alumina
  • A kind of preparation method of leaf-shaped nanometer gamma-alumina
  • A kind of preparation method of leaf-shaped nanometer gamma-alumina

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Add 7.5g of aluminum nitrate and 6g of urea into 70mL of deionized water, and stir magnetically for 20 minutes to obtain a colorless and transparent solution. Then the solution was transferred to the autoclave, and hydrogen gas was introduced to discharge the air in the autoclave, and then the hydrogen pressure in the autoclave was set to 0.5 MPa, and the autoclave was sealed. The temperature of the reaction kettle was raised to 120° C., and the reaction was carried out for 24 hours. After the reaction, the reaction kettle was naturally cooled to room temperature, the gas in the reaction kettle was discharged, the reaction kettle was opened, and the reaction slurry was collected. The reaction slurry was suction-filtered, and the filtrate was washed repeatedly with deionized water for 3 times, and then transferred to an oven at 80° C. for drying for 8 hours to obtain boehmite, a precursor of γ-alumina. Finally, put the boehmite into a muffle furnace for roasting, raise ...

Embodiment 2

[0027] Add 6.6g of aluminum sulfate and 6g of urea into 70mL of deionized water, and stir magnetically for 20 minutes to obtain a colorless and transparent solution. Then the solution was transferred to the autoclave, and hydrogen gas was introduced to discharge the air in the autoclave, and then the hydrogen pressure in the autoclave was set to 0.5 MPa, and the autoclave was sealed. The temperature of the reaction kettle was raised to 120° C., and the reaction was carried out for 24 hours. After the reaction, the reaction kettle was naturally cooled to room temperature, the gas in the reaction kettle was discharged, the reaction kettle was opened, and the reaction slurry was collected. The reaction slurry was suction-filtered, and the filtrate was washed repeatedly with deionized water for 3 times, and then transferred to an oven at 80° C. for drying for 8 hours to obtain boehmite, a precursor of γ-alumina. Finally, put the boehmite into a muffle furnace for roasting, raise ...

Embodiment 3

[0029] Add 7.5g of aluminum nitrate and 6g of urea into 70mL of deionized water, and stir magnetically for 20 minutes to obtain a colorless and transparent solution. Then the solution was transferred to an autoclave, and hydrogen gas was introduced to discharge the air in the autoclave, and then the hydrogen pressure in the autoclave was set to 0.4 MPa, and the autoclave was sealed. The temperature of the reaction kettle was raised to 140° C., and the reaction was carried out for 12 hours. After the reaction, the reaction kettle was naturally cooled to room temperature, the gas in the reaction kettle was discharged, the reaction kettle was opened, and the reaction slurry was collected. The reaction slurry was suction-filtered, and the filtrate was washed repeatedly with deionized water for 3 times, and then transferred to an oven at 80° C. for drying for 8 hours to obtain boehmite, a precursor of γ-alumina. Finally, put the boehmite into a muffle furnace for roasting, raise t...

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Abstract

The invention discloses a preparation method of flaky nanometer gamma-aluminum oxide. The preparation method includes the steps that 1, inorganic aluminum salt and urea are dissolved in water to obtain a transparent solution, and the solution is transferred into a high-pressure reaction kettle; 2, hydrogen is injected into the high-pressure reaction kettle, and certain pressure and temperature are kept for a reaction; 3, after the reaction is ended, reaction materials are subjected to filtering, washing and drying to obtain a boehmite precursor, and the flaky nanometer gamma-aluminum oxide is obtained after calcining. The method has no neutralizing, ageing and other complex steps, and has the advantages of be simple in technology and having a few reaction steps. The gamma-aluminum oxide powder with a large specific surface area and the uniform flaky structure can be obtained, and is suitable for synthesis of a nanometer gamma-aluminum oxide carrier, for a metal supported catalyst, with a large specific surface area.

Description

technical field [0001] The invention relates to a hydrothermal synthesis method of blade-shaped nanometer gamma-alumina, which is especially suitable for the synthesis of a high specific surface area nanometer-gamma-alumina carrier of a metal-loaded catalyst. Background technique [0002] Activated alumina with a mesoporous structure is one of the most important catalyst supports and adsorbents, and is widely used in the fields of petroleum processing catalysts and sewage treatment. So far, people have discovered 8 kinds of crystalline alumina, among which γ-alumina has been widely used because of its large specific surface area and pore volume, adjustable pore distribution, and good thermal stability. Widely used in various fields, such as catalytic synthesis, petrochemical and other aspects. One of the important properties of a catalyst support is its mesoporous structure characteristics and specific surface area. The first requirement for the catalyst carrier is to prov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B82Y40/00B01J32/00B01J35/02B01J35/10
Inventor 方向晨陈标华杨成敏梁鑫刘思嘉郭蓉
Owner CHINA PETROLEUM & CHEM CORP
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