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Spherical integral macroporous alumina and preparation method thereof

A technology of macroporous alumina and spherical alumina, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of unsuitability for mass production, fragile products, low preparation efficiency, etc., and achieve easy mass operation and molding. Simple and easy to implement, the effect of large pore size uniformity

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The monolithic macroporous alumina prepared by this method faces the same problems as the above-mentioned literature results: the macropore diameter is relatively large (1-50 μm), the pore size distribution is uneven, the mechanical strength of the material is low, and the obtained product is easily broken into shapes. and small particles of different sizes
However, in practical industrial applications, especially in the field of catalysis, the macropore distribution of the macroporous alumina carrier used is generally required to be less than 1 μm, and an excessively large pore size will lead to a significant decrease in the mechanical strength of the product to a certain extent; in addition, the above-mentioned The shape and size adjustment of the monolithic macroporous alumina particles prepared in the literature and patents needs to be controlled by the mold to control the shape and size of the product, the preparation efficiency is low, and it is not suitable for mass production

Method used

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  • Spherical integral macroporous alumina and preparation method thereof
  • Spherical integral macroporous alumina and preparation method thereof
  • Spherical integral macroporous alumina and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Synthesis of Monodisperse Polymer Microspheres. Get an appropriate amount of twice-distilled water and heat it to boil for 10 minutes to reduce the dissolved oxygen content in the water. After natural cooling of distilled water, 135 mL was added to a three-necked flask, and then the flask was placed in a water bath and heated to 75°C. Add 0.1348 g NaHCO 3 , start the stirrer, and start feeding N at the same time 2 , stabilized for 10 minutes to make NaHCO 3 Fully dissolve. Then add 0.0666 g of emulsifier and stabilize for 10 minutes, then add 30.7 mL of styrene monomer (St) and stabilize for 30 minutes. Finally, 0.1368 grams of initiator potassium persulfate (KPS) was added. The reaction system was kept at a constant temperature of 75° C., and the stirrer rotated at 300 rpm. After reacting for 20 hours, it was observed that there were basically no oil droplets on the wall of the three-necked flask. It can be considered that the conversion of styrene monomer had be...

Embodiment 2-4

[0029] According to the method of Example 1, polystyrene emulsion particles with different particle sizes can be synthesized by changing the dosage of each reagent. The specific test data are shown in Table 1.

[0030] Table 1 Synthesis of polystyrene microspheres by styrene emulsion polymerization

[0031]

[0032] #The emulsifier used is sodium lauryl sulfate; *The emulsifier used is sodium p-styrenesulfonate.

Embodiment 5

[0034] Alumina sol was prepared from aluminum nitrate. Make 7.5 grams of aluminum nitrate into a 0.5 mol / L solution, slowly add 1 mol / L ammonia water dropwise while stirring at room temperature until the pH is approximately equal to 8, and a white precipitate is obtained. After repeated washing of the precipitate with distilled water, the precipitate is washed with Disperse with 25ml of distilled water, then add 5ml of HNO with a concentration of 1.0mol / L 3The solution was peptized, and then sealed and aged at 85°C for 12 hours to obtain a transparent alumina sol, numbered ASol1.

[0035] Alumina sol was prepared from pseudoboehmite as raw material. 15 grams of pseudo-boehmite and 200 grams of distilled water were mixed and beaten, and then peptized with 30 ml of nitric acid with a concentration of 1.0 mol / L to obtain a stable and transparent alumina sol, coded ASol2.

[0036] Alumina sol was prepared from aluminum isopropoxide. Put aluminum isopropoxide / water in water at a...

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Abstract

The invention discloses spherical integral macroporous alumina and a preparation method thereof. The method comprises the following steps of: uniformly mixing polymer microspherical emulsion, alumina sol and a coagulant in a certain ratio, and dispersing the mixture in an oil phase to obtain W / O liquid drops; heating the miscible phase system to make the alumina sol in an aqueous phase gelatinized into spheres; separating out the formed gel microspheres from the oil phase; and ageing in an ammonia water medium, drying, and roasting to obtain the spherical integral macroporous alumina. The macropore size of the alumina is uniform and controllable in a range of less than 1 mu m, spherical particles have controllable size and high mechanical strength, and the forming process is simple and feasible, and is suitable for mass preparation.

Description

technical field [0001] The invention relates to a spherical monolithic macroporous alumina and a preparation method thereof, belonging to the field of inorganic material preparation. Background technique [0002] Monolithic macroporous oxides are widely used in heterogeneous catalysts, catalyst supports, adsorption and separation materials, chromatographic packing, electrode materials, acoustic resistance and thermal stability due to their large pore structure, high specific surface area and good thermal stability. Resistive materials and other fields. [0003] "Chemical Material" (2004, volume 16, pages 4245-4256) has reported that acrylamide is used as an organic monomer, N, N-methylenebisacrylamide crosslinking agent, respectively with Triton X-405 and PVA as the surface Active agent and stabilizer, using mineral oil as dispersed phase, ammonium persulfate and tetramethylethylenediamine as initiator, prepared porous polymer foam microsphere template by emulsion polymeriz...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 杨卫亚沈智奇凌凤香孙万付王丽华季洪海郭长友
Owner CHINA PETROLEUM & CHEM CORP
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