Aluminum oxide carrier and preparation method and application thereof

A technology of alumina carrier and alumina sol, which is applied in the direction of catalyst carrier, chemical instrument and method, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the uneven distribution of strength and non-concentrated pore size distribution of alumina carrier , Instable catalyst performance and other problems, to achieve the effect of concentrated pore distribution, not easy to porcelain, and avoid non-concentrated pore size distribution

Inactive Publication Date: 2019-04-05
杨斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to provide an alumina carrier and its preparation method and application. The alumina carrier has a good pore structure, concentrated pore distribution, uniform and controllable pore diameter, high specific surface area, large pore volume and high

Method used

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  • Aluminum oxide carrier and preparation method and application thereof
  • Aluminum oxide carrier and preparation method and application thereof
  • Aluminum oxide carrier and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Aluminum sol preparation. Take 60 grams of pseudo-boehmite, 6 grams of methylcellulose, 4 grams of starch, 4 grams of hexamethylenetetramine, and 6 grams of urea, add an appropriate amount of deionized water and stir to form a suspension with a mass content of 25% alumina , continue to stir for 2 hours, slowly add 15.5 g of citric acid solution with a mass concentration of 25%, and stir at 35°C for 2 hours to form an alumina sol slurry;

[0058] (2) Aluminum sol molding. The oil phase of the hot oil column is liquid paraffin, the temperature of the oil bath is 85° C., the aperture of the drip nozzle is 1.5 mm, and the dripping speed is 2 drops / second. Drop the aluminum sol prepared in (1) into a hot oil column to form a ball, collect the formed pellets under the oil column, transfer to an aging kettle for aging at 120°C for 12 hours, then wash with water, and dry at 130°C for 8 hours;

[0059] (3) Thermal activation of the shaped carrier. Place the dried shaped c...

Embodiment 2

[0061] (1) Aluminum sol preparation. Take 45 grams of 10-mesh aluminum powder, slowly add 450ml of hydrochloric acid with a mass concentration of 30%, react at 85°C for 2.5 hours, add 6 grams of methylcellulose, 4 grams of starch, 4 grams of hexamethylenetetramine, and 6 grams of urea Stir after deionized water to form a suspension with a mass content of 35% alumina, and continue stirring for 2 hours to form alumina sol slurry;

[0062] (2) Aluminum sol molding. The oil phase of the hot oil column is liquid paraffin, the temperature of the oil bath is 95° C., the aperture of the drip nozzle is 2.0 mm, and the dripping speed is 3 drops / second. Drop the aluminum sol prepared in (1) into a hot oil column to form a ball, collect the formed pellets under the oil column, transfer to an aging kettle for aging at 150°C for 12 hours, then wash with water, and dry at 130°C for 8 hours;

[0063] (3) Thermal activation of the shaped carrier. Place the dried molded carrier in a high-tem...

Embodiment 3

[0065] (1) Take 70 grams of pseudoboehmite, 5 grams of polyacrylamide, 5 grams of methylcellulose, and 10 grams of urea, add an appropriate amount of deionized water and stir to form a suspension with a mass content of alumina of 35%, and continue Stir for 2 hours, slowly add 10 g of nitric acid solution with a mass concentration of 35%, and stir at 50°C for 10 hours to form an alumina sol slurry;

[0066] (2) Add 60 grams of boehmite and 20 grams of gibbsite to the aluminum sol prepared in (1), mix evenly, add 10 grams of asparagus powder, 2 grams of 35% nitric acid, mix and knead, and extrude , dried at 130°C for 8 hours;

[0067] (3) Place the dried shaped carrier in a high-temperature furnace, raise the temperature to 1050°C at a heating rate of 2°C / min and keep the temperature constant for 4 hours. ℃ respectively constant temperature 6h. The physical properties of the carrier are listed in Table 1.

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Abstract

The invention provides an aluminum oxide carrier and a preparation method and application thereof. The aluminum oxide carrier has a diameter of 0.5-3.5mm and a specific surface area of 40-200m<2>/g, and holes in diameter of 15-20nm accounts for total hole quantity by 90% or more. The preparation method of the aluminum oxide carrier includes steps: (1) aluminum oxide sol preparation; (2) adding a pore-enlarging agent and/or a gelatinizing agent into aluminum oxide sol to form a precursor, and subjecting the precursor to thermal treatment and molding; (3) drying formed aluminum oxide at 100-150DEG C, heating to 950-1120 DEG C by a heating rate of 1-5 DEG C/min, and keeping the constant temperature for 6-10h to obtain the aluminum oxide carrier, wherein in a heating process, sequentially keeping the constant temperature for 1-10h in four temperature ranges of 200-300 DEG C, 400-500 DEG C, 600-700 DEG C and 800-900 DEG C. The aluminum oxide carrier prepared according to the method has a great and stable porous structure, is concentrated in pore distribution and uniform and controllable in pore diameter and has advantages of high specific surface area, large pore volume and high anti-crush strength.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an alumina carrier and its preparation method and application. technical background [0002] Alumina is widely used as a material for the production of catalyst supports due to its excellent characteristics such as high specific surface area, good adsorption, thermal stability and surface acidity. The most commonly used support for low-carbon alkane dehydrogenation catalysts is alumina support. According to different dehydrogenation production processes, the shape of alumina support is spherical, strip and other shapes. At present, the dominant dehydrogenation production processes in the market are Oleflex process of UOP Company and Catofin process of ABB-Lummus Company. Oleflex is a moving bed process, and Catofin is a fixed bed process. For the moving bed process, in order to realize the continuous delivery of the catalyst and meet other industrial operation indicators and ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J35/10B01J23/42B01J23/26C07C11/06C07C5/333C07C11/09
CPCB01J32/00C07C5/3335C07C5/3337B01J21/04B01J23/26B01J23/42B01J35/1042Y02P20/52
Inventor 杨斌
Owner 杨斌
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