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Preparation method for macro-porous aluminum oxide carrier

A macroporous alumina carrier technology, applied in catalyst carrier, chemical instrument and method, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as collapse, pore volume and macropore content reduction

Active Publication Date: 2017-10-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the molding process of the alumina carrier, it is necessary to knead pseudo-boehmite dry rubber powder, extrusion aids, peptizers, etc. The macropores of the body itself partially collapse, so that the pore volume and macropore content of the final carrier are greatly reduced

Method used

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  • Preparation method for macro-porous aluminum oxide carrier
  • Preparation method for macro-porous aluminum oxide carrier
  • Preparation method for macro-porous aluminum oxide carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 100g of pseudoboehmite dry rubber powder (produced by Wenzhou Jingjing Alumina Co., Ltd.) and place it in a round-bottomed flask, add 300 grams of deionized water to the flask for beating, and add an appropriate amount of nitric acid to the above slurry with a molar concentration of 3mol / L, the mixed acid solution whose molar concentration of acetic acid is 1mol / L, the pH value of the slurry is controlled to be 3 and heated to reflux at 40°C for 3 hours. The above slurry was transferred into an autoclave, 10 g of urea was added to the mixed material, and the autoclave was sealed and heat treated at 140° C. for 6 hours. After cooling to room temperature, the mixed slurry was filtered, washed, and dried at 120° C. for 8 hours to obtain pseudo-boehmite.

[0023] Weigh 100 g of the above-mentioned pseudo-boehmite and place it in a beaker, add 200 mL of xylitol aqueous solution with a mass concentration of 25% to the beaker and soak for 4 hours. The impregnated mater...

Embodiment 2

[0025]With embodiment 1, only the add-on of deionized water is 700 grams. The mixed acid is a mixed acid dissolved with 4 mol of sulfuric acid and 1 mol of oxalic acid, the pH value of the slurry is controlled to be 2, and the temperature of heating and refluxing is 30°C for 5 hours. The addition amount of urea is 15 grams, and hydrothermal treatment temperature is 120 ℃, and hydrothermal treatment is 8 hours. The pseudo-boehmite was impregnated with a mixed aqueous solution of sorbitol and mannitol with a mass concentration of 40% and a mass ratio of 1:1 for 3 hours. The carbonization treatment temperature is 130°C, and the treatment time is 14 hours. Alumina carrier A2 was prepared, and the properties of the carrier are shown in Table 1.

Embodiment 3

[0027] With embodiment 1, only the add-on of deionized water is 1000 grams. The mixed acid is a mixed acid dissolved with 6mol / L sulfuric acid and 1mol / L citric acid, the pH value of the slurry is controlled to be 5, the heating reflux temperature is 60°C, and the reflux time is 1 hour. The amount of urea added was 20 grams, the hydrothermal treatment temperature was 160° C., and the hydrothermal treatment time was 4 hours. The pseudo-boehmite was impregnated with a mixed aqueous solution of glucose and ribose with a mass ratio of 1:1 at a mass concentration of 30% for 5 hours. The carbonization treatment temperature is 120° C., and the carbonization treatment time is 16 hours. Alumina carrier A3 was prepared, and the properties of the carrier are shown in Table 1.

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Abstract

The invention discloses a preparation method for a macro-porous aluminum oxide carrier. The method comprises the following steps: (1) mixing and pulping pseudo-boehmite and deionized water, adding a defined amount of mixed acid solution of organic acid and inorganic acid into the pulp, heating and performing refluxing treatment; (2) adding a defined amount of urea, performing hydro-thermal treatment, washing and drying the pulp after the hydro-thermal treatment; (3) using an aqueous solution containing polyhydric alcohols and / or carbohydrate for steeping the dry pseudo-boehmite rubber powder acquired in the step (2) and then performing hydrothermal carbonizing treatment; (4) mixing the materials treated in the step (3) and a defined amount of extrusion agent and peptizing agent, nipping and forming, drying and roasting, thereby acquiring a final macro-porous aluminum oxide carrier. The macro-porous aluminum oxide carrier prepared according to the method has larger pore volume and aperture. The carrier is suitable for the field of the preparation of a hydrogenation demetalization catalyst for heavy oil and residual oil.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier, in particular to a method for preparing an alumina carrier with relatively large pore volume and pore diameter. Background technique [0002] At present, in the production process of heavy oil hydrodemetallization, because the raw oil contains a certain amount of impurities such as vanadium, sulfur, arsenic, nickel, etc., it is easy to form deposits, thereby blocking the pores of the catalyst, resulting in a rapid decline in catalyst activity, and even Inactivation affects industrial applications. Catalysts with larger pore volume and larger pore diameter have strong metal and carbon storage capacity, which can slow down the deactivation of the catalyst and prolong the operation period of the catalyst. The pore structure of the catalyst is determined by the carrier that constitutes the catalyst. Therefore, the preparation of a carrier with a larger pore volume and larger pore diameter...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J23/883
Inventor 佟佳吕振辉
Owner CHINA PETROLEUM & CHEM CORP
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