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Macro-porous aluminum oxide and preparation method thereof

A macroporous alumina, alumina technology, applied in alumina/aluminum hydroxide and other directions, can solve the problems of high organic solvent, flying temperature, increased cost, etc., and achieve the effect of high specific surface area

Active Publication Date: 2012-11-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of organic solvent added in this method is relatively high, which not only increases the cost, but also has a temperature jump during high-temperature roasting, which is difficult to control. The pore diameter of the prepared alumina is

Method used

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  • Macro-porous aluminum oxide and preparation method thereof
  • Macro-porous aluminum oxide and preparation method thereof

Examples

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preparation example Construction

[0013] The preparation method of macroporous alumina of the present invention, comprises the steps:

[0014] (1) adding a basic compound or an acidic compound to the aluminum hydroxide suspension to adjust the pH value of the suspension and carry out a period of aging,

[0015] (2) Add fatty alcohol to the first-stage aging slurry to carry out second-stage aging. After aging, separate the fatty alcohol, dry and roast the slurry from which the fatty alcohol has been removed.

[0016] In the above method, step (1) is to adjust the pH value of the precursor aluminum hydroxide suspension for the preparation of alumina and then age it. The aluminum hydroxide suspension is made of boehmite, pseudoboehmite or thin It is prepared from a mixture of diaspore and pseudo-boehmite, and its pH value is 7.3 to 8.5. The boehmite or pseudo-boehmite is preferably prepared by aluminum salt precipitation or alkoxy aluminum hydrolysis, more preferably by alkoxy aluminum hydrolysis.

[0017] (1) ...

example 1

[0027] Get 70g of pseudo-boehmite powder (produced by Changling Catalyst Factory, dry basis alumina content 70% by mass) and add in a three-necked flask, add 440g of deionized water, stir to form an aluminum hydroxide suspension with a solid content of 9.85% by mass, stir After uniformity, let it stand and measure its pH value to be 7.6. Add 0.5 ml of a 10% by mass sodium hydroxide solution therein, mix well, the pH of the slurry is 8.7, and perform a period of aging at 120° C. for 6 hours. Heat and evaporate 160 g of deionized water, add 6 ml of ethanol, transfer the slurry to a stainless steel pressure tank lined with polytetrafluoroethylene, and perform two-stage aging at 120° C. for 6 hours. Cool to 25 DEG C, use centrifugation to separate the ethanol of the upper layer, transfer the aluminum hydroxide slurry layer of the lower floor to the flask for flash evaporation, the solid content of the aluminum hydroxide slurry layer obtained after flash evaporation is 35% by mass,...

example 2

[0029] Alumina was prepared according to the method of Example 1, except that 1 ml of sodium hydroxide solution with a concentration of 10% by mass was added to the aluminum hydroxide suspension, the pH value of the suspension was adjusted to 9.0 for a period of aging, and 6 ml of ethanol was added for secondary aging. Stage aging, after dealcoholization and flash evaporation, the aluminum hydroxide slurry with a solid content of 45% by mass is obtained; it is dried and roasted to obtain γ-Al 2 o 3 B, its pore diameter, pore volume and specific surface area are shown in Table 1.

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PUM

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Abstract

The invention provides macro-porous aluminum oxide. The average diameter of holes is the diameter of a most probable hole; the size of the holes is 1.1-3.5 ml / g; and the specific surface area is 150-450 m<2> / g. The aluminum oxide is prepared by a two-section ageing method; the first section of ageing comprises the following steps of: adding an alkaline compound or an acidic compound into an aluminum hydroxide suspension solution to adjust the pH (Potential of Hydrogen) value of the suspension solution and then ageing; and the second section of ageing comprises the following steps of: adding fatty alcohol; after ageing, separating out the fatty alcohol; and drying and roasting slurry without the fatty alcohol to obtain the aluminum oxide with a large hole diameter, a large specific surface area and a large hole volume. The aluminum oxide is suitable for a carrier of a hydrocarbons conversion catalyst.

Description

technical field [0001] The invention relates to alumina and a preparation method thereof, in particular to alumina with large pores and a preparation method thereof. Background technique [0002] With the development of science and technology, people have increasingly stringent requirements on material performance. γ-Al known as "activated alumina" 2 o 3 , due to the advantages of porosity, high dispersion, high specific surface area, good adsorption and surface acidity, and cheap and easy to obtain, it is often used as a catalyst carrier for petrochemical processes such as hydrogenation, dehydrogenation, desulfurization, and cracking. It is an industrial One of the most widely used catalyst supports. [0003] As a carrier of alumina, its pore structure has an important influence on the activity, selectivity and life of the catalyst, and the alumina carrier with the characteristics of large pore size and large pore volume structure is used in catalytic hydrogenation, resi...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 胡亚琼马爱增蔡迎春杨彦鹏
Owner CHINA PETROLEUM & CHEM CORP
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