A kind of preparation method of modified alumina carrier

A technology of alumina support and modification, which is applied in the direction of catalyst support, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems such as the influence of support mechanical strength, and achieve the improvement of pore structure and mechanical strength. Strength, the effect of increasing the grain size

Active Publication Date: 2019-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the addition of physical pore-enlarging agents will affect the mechanical strength of the carrier, in addition, the interaction between the active component and the carrier needs to be further improved

Method used

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  • A kind of preparation method of modified alumina carrier
  • A kind of preparation method of modified alumina carrier
  • A kind of preparation method of modified alumina carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Weigh 10 grams of montmorillonite and bake at 950 °C for 5 hours. Mix the roasted montmorillonite with 200 g of pseudo-boehmite dry rubber powder (produced by Shandong Aluminum Co., Ltd.) and 6 grams of celadon powder, and pour into the mixture An appropriate amount of aqueous solution containing 5 grams of acetic acid was added to the material, extruded into a strip, dried at 120° C. for 5 hours, and then calcined at 300° C. for 5 hours. Put the roasted pseudo-boehmite in the polytetrafluoroethylene lining of the autoclave, add 400 grams of sodium hydroxide solution with a concentration of 4 mol / L at the same time, and heat the sealed autoclave at 90 ° C for 4 hours. The final material was filtered, washed with deionized water, dried at 110°C for 6 hours, and calcined at 600°C for 8 hours to obtain an alumina carrier.

[0033] Weigh 100 grams of the above-mentioned γ-phase cylindrical strip-shaped alumina carrier and put it into the spray rolling pot, and in the rotatin...

Embodiment 2

[0035] With embodiment 1, the add-on of diatomaceous earth is 30 grams. The low-temperature calcination temperature is 250° C., and the calcination time is 10 hours. The alkaline solution is a potassium hydroxide solution with a concentration of 3 mol / L, and the consumption of the solution is 1500 grams. The heat treatment temperature of the mixture was 100° C., and the treatment time was 3 hours. The alumina carrier is in the shape of clover strips. For the first spray and impregnation, use 30ml of an aqueous solution of sorbitol with a mass concentration of 30%, and for the second spray and impregnation, use 50ml of an aqueous solution of sorbitol with a mass concentration of 10%. In the first spraying and impregnation, 20ml of sorbitol aqueous solution with a mass concentration of 5% was used. The carbonization temperature was 200°C and the carbonization time was 8 hours to obtain carbon-containing alumina carrier S2. The properties of the carrier are shown in Table 1.

Embodiment 3

[0037] The montmorillonite was changed into kaolin the same as in Example 1, the roasting temperature was 1000° C., and the addition of kaolin was 20 grams. The low-temperature calcination temperature is 350° C., and the calcination time is 7 hours. The alkali solution is that the concentration is 5mol / L, and the solution consumption is 1200 grams. The heat treatment temperature of the mixture was 70° C., and the treatment time was 4 hours. Adopt four times of spray impregnation, use 20ml mass concentration to be the aqueous solution of mannitol of 50% when spraying and impregnating for the first time, use 40ml mass concentration to be the aqueous solution of sorbitol of 30% when spraying and impregnating for the second time, the third time Use 20ml of an aqueous solution of sorbitol with a mass concentration of 20% for spray impregnation, and use 20ml of an aqueous solution of sorbitol with a mass concentration of 10% for the fourth spray and impregnation. During the carbon...

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Abstract

The invention discloses a preparation method of a modified alumina carrier. The method comprises the following contents: (1) kneading and compacting clay after high-temperature treatment and pseudo-boehmite and carrying out drying and low-temperature roasting on a forming material; (2) soaking the material obtained in the step (1) by using an alkali solution, carrying out sealing thermal treatment, washing, drying and roasting to prepare an alumina carrier; (3) preparing at least two polyhydric alcohol and / or monosaccharide water solutions of different concentrations and spraying the polyhydric alcohol and / or monosaccharide water solutions to the alumina carrier according to the order of the concentration from high to small; and (4) carrying out hydrothermal carbonization treatment on the alumina carrier dipped in the step (3) in a sealed container, and carrying out drying treatment to prepare the modified alumina carrier. The alumina carrier prepared through the method has a proper pore structure; meanwhile, carbon modification is carried out on a channel surface of the alumina carrier and the carbon content is in uneven distribution in the radial direction of the carrier; the carrier is suitable for the field of preparation of a heavy oil or residual oil hydrodemetallization catalyst.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier, in particular to a method for preparing a carbon-modified alumina carrier. 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 is an important step in the preparat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18B01J32/00B01J23/883
CPCB01J21/18B01J23/883B01J37/0207B01J37/084B01J37/10B01J35/635B01J35/647B01J35/615
Inventor 佟佳吕振辉
Owner CHINA PETROLEUM & CHEM CORP
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