Alpha-alumina carrier and preparation method thereof

A technology of alumina carrier and alumina water, which is applied in the field of catalysis, can solve the problems of increasing the pore volume and pore diameter of alumina, and achieve the effect of ensuring smooth operation

Active Publication Date: 2014-02-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Alpha-alumina carrier and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Weigh 255.00g gibbsite, 169.00g pseudo-alumina monohydrate, 75.00g ammonium fluoride, 1.00g barium sulfate, put them into the mixer and mix for 15min to obtain a solid powder mixture, then add dilute nitric acid (nitric acid: water = 1:3, weight ratio), transfer the mixture to a kneader for 20 minutes, knead and cut into seven-hole columns on a molding machine, dry the columns at 30°C for 45 hours, and then The pillars were calcined at a temperature of 1300° C. for 20 h at a constant temperature, and finally cooled to room temperature.

[0022] X-ray diffraction analysis results show that the product is α-alumina, and its XRD pattern is as follows figure 1 shown. The most probable pore size of the α-alumina support is 9.03 μm as measured by a mercury intrusion tester. The BET specific surface area of ​​the α-alumina carrier measured by the specific surface-pore size distribution analyzer is 0.18m 2 / g.

Embodiment 2

[0024] Weigh 313.79g gibbsite, 116.22g pseudo-alumina monohydrate, 50.00g magnesium fluoride, 20.00g magnesium chloride, put them into a mixer and mix for 50min to obtain a solid powdery mixture, then add dilute nitric acid ( Nitric acid: water = 1:8, weight ratio), transfer the mixture to a kneader for 50 minutes, knead and cut into five-hole columns on a molding machine, dry the columns at 90°C for 45 hours, and then knead The pillars were calcined at a temperature of 1550° C. for 10 hours at a constant temperature, and finally cooled to room temperature.

[0025] The results of X-ray diffraction analysis indicated that the product was α-alumina. The most probable pore size of the α-alumina support is 7.76 μm as measured by a mercury intrusion tester. The BET specific surface area of ​​the α-alumina carrier measured by the specific surface-pore size distribution analyzer is 0.32m2 / g.

Embodiment 3

[0027] Weigh 363.91g gibbsite, 101.09g pseudo-alumina monohydrate, 25.00g magnesium fluoride, 10.00g barium sulfate, put them into the mixer and mix for 40min to obtain a solid powder mixture, then add dilute nitric acid (nitric acid: water = 1:5, weight ratio), transfer the mixture to a kneader for 30 minutes, cut into single-hole columns on a molding machine after kneading, dry the columns at 80°C for 30 hours, and then The pillars were calcined at a temperature of 1200° C. for 30 hours at a constant temperature, and finally cooled to room temperature.

[0028] The results of X-ray diffraction analysis indicated that the product was α-alumina. The most probable pore size of the α-alumina support is 3.46 μm as measured by a mercury intrusion tester. The BET specific surface area of ​​the α-alumina carrier measured by the specific surface-pore size distribution analyzer is 1.09m 2 / g.

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Abstract

The invention provides an alpha-alumina carrier. The most probable pore size of the alpha-alumina carrier is 3.00-9.50 microns, and the specific surface area is 0.15-1.20m<2>/g. The macroporous alpha-alumina carrier is used for catalyzing reaction, in particular for catalyzing epoxidation of ethylene to prepare ethylene oxide, and the heat produced in the catalysis process can be immediately transferred and evacuated so as to guarantee the stabilization of the catalyst and the stable operation of a reaction device. The invention further provides a method for preparing the alpha-alumina carrier. The method comprises the following steps: step A, uniformly mixing gibbsite, pseudo alumina monohydrate, a fluorine-containing compound and alkaline earth salt to obtain solid powder, and adding an adhesive and water to obtain a mixture; step B, kneading, forming, drying and roasting the mixture of the step A to obtain the alpha-alumina carrier, wherein the mass of the fluorine-containing compound is 5-15% of the solid powder.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to an alpha-alumina carrier and a preparation method thereof. The carrier can be used in olefin epoxidation reaction, especially ethylene epoxidation to prepare ethylene oxide. Background technique [0002] The research on alumina materials has always been one of the key points and hot spots in the fields of materials science and catalysis. Its huge application prospect makes scientists pay great attention to the synthesis of alumina. Alumina materials with high hardness, high strength, heat resistance, and corrosion resistance have made great progress in the fields of fine ceramics, composite materials, adsorption separation, and catalysis. Especially in the field of petrochemical catalysis, alumina supports with different shapes are widely used in catalytic oxidation and catalytic hydrogenation. This is because the alumina carrier plays a very important role in th...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04
Inventor 王辉林伟李雪莲李金兵陈建设张志祥薛茜李秀聪何学勤
Owner CHINA PETROLEUM & CHEM CORP
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