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Rodlike alumina carrier preparation method and alumina carrier

A technology of alumina carrier and alumina, which is applied in the direction of catalyst carrier, chemical instrument and method, catalyst activation/preparation, etc., to achieve the effect of suitable water absorption rate, firm skeleton structure and high mechanical strength

Active Publication Date: 2020-03-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no prior art that discloses the preparation method of a rod-shaped alumina carrier, especially the preparation method of a rod-shaped alumina carrier suitable for alkane dehydrogenation catalysts

Method used

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  • Rodlike alumina carrier preparation method and alumina carrier
  • Rodlike alumina carrier preparation method and alumina carrier
  • Rodlike alumina carrier preparation method and alumina carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of rod-shaped alumina

[0038] Measure 8400mL of deionized water and 1400mL of ethylene glycol into a 20L reactor, then weigh 2918.0g of aluminum nitrate nonahydrate and 2336.0g of urea and dissolve them completely in the above-mentioned mixed solution of water and ethylene glycol, and seal the reactor , set the rotation speed of the stirring paddle to 100rpm, the reaction temperature to 100°C, and the reaction time to 36h. After the reaction, the alumina precursor was obtained, filtered and washed with deionized water three times, washed once with absolute ethanol, and dried in an oven at 80°C for 24h. It is then fired in a muffle furnace for 2 hours to obtain the final rod-shaped alumina. The calcination temperature of the precursor and the texture parameters of the obtained rod-shaped alumina are given in Table 1.

[0039] Table 1 Precursor calcination temperature and structural parameters of rod-shaped alumina powder

[0040]

[0041] In the followi...

Embodiment 2

[0044] Weigh the prepared Al 2 o 3 -600g of rod-shaped alumina powder, 80.0g, mixed with 5.6g of scallop powder, stirred evenly (in a closed reaction kettle, the stirring speed of the stirring paddle was 70rpm, and stirred for 24h), and then the mixture of alumina and squat powder was put into kneading Mix 10min in the machine; Take by weighing concentrated nitric acid (concentration is 68wt%) 15.4g (it should be noted here that, the concentrated nitric acid that concentrated nitric acid concentration is in the scope of 65-68 mass % among the present invention all can be used in the present invention), dissolved Prepare a dilute nitric acid solution in 100g of deionized water, that is, the ratio of acid to powder is 0.18, and the ratio of water to powder is 1.17, and spray evenly into the mixed powder in the kneader; knead the above mixed material evenly, take it out after 60 minutes, and put it into the twin-screw extruder with a cylindrical orifice plate of Φ3.5 mm to obtai...

Embodiment 3

[0046] Adopt the same method as in Example 2 to prepare alumina moldings, the difference is that 5.6g of scallop powder and starch mixed extrusion aids are used, 14.6g of concentrated nitric acid is added, that is, the acid-powder ratio is 0.17, and the dried moldings Calcined at 700°C for 4 hours to obtain a molded product, denoted as A 2 . The radial compressive strength, water absorption, standard deviation and coefficient of variation of strength of the molded product obtained were measured, and the results are listed in Table 2.

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Abstract

The invention discloses a rodlike alumina carrier preparation method and an alumina carrier. The preparation method comprises the following steps: (1) uniformly mixing rodlike alumina powder with an extrusion aid; (2) uniformly mixing a peptizing agent and water, and uniformly spraying the mixture obtained in the step (1); and (3) molding the material obtained in the step (2), drying and roastingto obtain the final alumina carrier. The alumina carrier prepared by the method provided by the invention not only has a firm skeleton structure, but also can uniformly distribute active components inpores, that is, shows comprehensive properties such as high mechanical strength, proper water absorption rate and the like, and is especially suitable for being used as a carrier of an alkane dehydrogenation catalyst.

Description

technical field [0001] The invention relates to a preparation method of rod-shaped alumina. Especially the preparation method of rod-shaped alumina suitable for alkane dehydrogenation catalyst. Background technique [0002] Alumina is widely used as a catalyst carrier because of its high specific surface area, suitable acidity and good thermal stability. [0003] Although the macroscopic performance of alumina is powdery, its microscopic appearance varies widely, known as spherical, fibrous, rod, flower, flake, etc. In the process of industrial application, the macroscopic shape of alumina is powdery. It needs to go through the molding process to meet the requirements of various aspects of the catalyst for practical applications. [0004] During the molding process, alumina has differences due to its different microscopic morphology and the way of agglomeration or overlapping between its basic structural units. If the microscopic morphology of alumina is spherical, the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J32/00B01J35/00B01J35/02B01J35/10B01J37/08
CPCB01J37/0018B01J21/04B01J35/30B01J35/50B01J35/633B01J35/647B01J35/615
Inventor 陆安慧吴凡
Owner DALIAN UNIV OF TECH
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