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Modified carbon-coated alumina supporter with nucleocapsid structure and preparation method thereof

A technology of alumina carrier and core-shell structure, applied in catalyst carriers, chemical instruments and methods, catalyst activation/preparation, etc. Anti-coking performance, large pore volume, the effect of prolonging the service life

Inactive Publication Date: 2008-12-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that although activated carbon has a high specific surface area, its pore structure is rich in micropores, which is difficult for mass transfer in the hydrodesulfurization process (HDS) of larger molecules such as dibenzothiophene (DBT). The resistance is very high, and these micropores are difficult to be used
For some mesoporous carbon materials, it is difficult to be applied due to poor mechanical strength and small specific surface.

Method used

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  • Modified carbon-coated alumina supporter with nucleocapsid structure and preparation method thereof
  • Modified carbon-coated alumina supporter with nucleocapsid structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 , Preparation of carbon-coated alumina carrier

[0034] 1.1, preparation of colloid: 1.5118gNi(NO 3 ) 2 ·6H 2 O was dissolved in 40mL of isopropanol, adding 0.4064g of aluminum isopropoxide, with 4MHNO 3Adjust the pH to 5, stir well until the aluminum isopropoxide is completely dissolved, put the three-neck flask in a water bath at 80°C, continue stirring and add 10 mL of water for hydrolysis for 0.5 hours, then cool to room temperature to obtain hydrated alumina colloid.

[0035] 1.2. Loading of colloid: immerse 2g clover-shaped alumina strips in the above colloid for 2 minutes, filter dry, place in ventilation for 30 minutes, and then send it to an oven for drying at 100-120°C for 10 hours. The dried samples were fired in a muffle furnace at 400°C for 4 hours.

[0036] 1.3. Carbon coating on the surface of industrial alumina: the roasted sample is placed in the reaction furnace, and the mixed gas of argon and hydrogen is introduced, and the flow rate i...

Embodiment 2

[0038] Example 2 , Preparation of carbon-coated alumina carrier

[0039] 2.1. Preparation of colloid: add 0.5906g of aluminum sec-butoxide to 30ml of ethanol, and add 4M HNO at the same time 3 2mL, stir well at room temperature, add 1.0581g Ni(NO 3 ) 2 ·6H 2 O and water 10mL, the pH value is 1, start to heat up to 60 ° C, continue to stir for 2 hours, stop stirring and cool to room temperature after a clear sol is formed, and obtain hydrated alumina colloid.

[0040] 2.2. Loading of colloid: Weigh 16.05g of spherical industrial alumina carrier with a diameter of 4mm and place it in a dry beaker, slowly add the prepared sol to the alumina carrier drop by drop, stir while adding, and place the beaker at the same time Heat in a water bath at 60-80°C until the sol is completely absorbed by the industrial alumina carrier. Then put the alumina carrier into an oven for drying at 100-120°C for 6 hours. The dried samples were calcined in a muffle furnace at 550°C for 3 hours. ...

Embodiment 3

[0042] Example 3 , Preparation of carbon-coated alumina carrier

[0043] 3.1. Preparation of colloid: Add 0.6g aluminum isopropoxide and 1g Ni(NO 3 ) 2 ·6H 2 O, after adding 10mL of water, with 4M HNO 3 Adjust the pH to 2, raise the temperature to 40°C and stir for 4 hours to obtain a clear colloid.

[0044] 3.2. Loading of colloid: After putting the colloid solution into the sprayer, spray 20g of columnar industrial alumina with a diameter of 2mm, and then dry it in an oven for 4 hours, and bake the dried sample in a muffle furnace at 600°C for 2 hours .

[0045] 3.3. Carbon coating on the surface of industrial alumina: the roasted sample is placed in the reaction furnace, and the mixed gas of argon and hydrogen is introduced, and the flow rates are Ar / H 2 =80 / 20 (mL / min), the reaction furnace is heated up to 650°C at a temperature of 3°C / min and kept for 0.5 hours, then stop feeding the mixed gas of argon and hydrogen, and switch to the mixed gas of carbon monoxide an...

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Abstract

The present invention discloses a modified carbon-covered alumina support with a core-shell structure and a preparation method thereof. The modified carbon-covered alumina support of the present invention is a granule with the core-shell structure. A shell of the core-shell structure is alumina deposited with carbon, and an inner core of the core-shell structure is an industrial alumina support. The modified carbon-covered alumina support of the present invention has the advantages of high specific surface area, large pore volume, high mechanical strength, and the like; the aperture distribution is more concentrated; total acid quantity is increased obviously, and strong acid quantity is reduced; the modified carbon-covered alumina support can be directly used as a catalyst during certain processes and is more applicable to be used as a catalyst support, in particular as a hydrogenation treatment catalyst support during petroleum processing course.

Description

technical field [0001] The invention relates to the field of catalyst carriers, and mainly relates to a modified carbon-coated alumina carrier with a core-shell structure and a preparation method thereof. Background technique [0002] As a commonly used catalyst carrier in the petrochemical industry, alumina has always been the most widely used and used catalyst carrier because of its good mechanical stability, easy control of specific surface area and pore structure, and low price and availability. Almost all hydrogen treatment catalysts use alumina or modified and composite alumina as a carrier. Therefore, the research on the preparation and modification technology of alumina carrier has always been one of the important research contents of scientists and catalyst companies. [0003] Research on alumina as a catalyst support shows that alumina not only acts as an inert support, but also promotes the formation of active phases in hydrotreating catalysts. Al 2 o 3 The in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J35/02B01J37/02B01J21/04B01J35/00
Inventor 周静红郭蓉韩伟伟方向晨隋志军周兴贵
Owner EAST CHINA UNIV OF SCI & TECH
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