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Aluminum oxide-activated carbon composite carrier, preparation method and prepared catalyst

A composite carrier and activated carbon technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst carriers, etc. problems such as high porosity and limited application, to achieve excellent hydrodesulfurization performance and optimize pore structure

Inactive Publication Date: 2010-10-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the weakness of activated carbon as a catalyst carrier is that the microporosity of conventional activated carbon is relatively high, and it is difficult to meet the requirements of hydrodesulfurization of macromolecular sulfur-containing compounds (such as dibenzothiophene and its derivatives).
However, most mesoporous activated carbon materials have poor mechanical strength and high preparation costs, which limit their application in industrial production.

Method used

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  • Aluminum oxide-activated carbon composite carrier, preparation method and prepared catalyst
  • Aluminum oxide-activated carbon composite carrier, preparation method and prepared catalyst
  • Aluminum oxide-activated carbon composite carrier, preparation method and prepared catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Preparation of alumina-activated carbon composite carrier

[0016] Weigh 4 grams of ball milled to less than 320 mesh (0.046mm) alumina (Al 2 o 3 ) powder, add 1 milliliter of 50% aqueous acetic acid solution, stir for 30 minutes to fully mix, then add 1 gram of active carbon (marked as AC) powder with equal particle size, and add 1.2 grams of sucrose as a binder, and continue to stir for 15 minutes Make the mixture even. Gained black viscous matter was left to stand in a closed plastic container for 24 hours, and then pressed into tablets. The obtained small cylindrical shape was dried at 110°C, then calcined at 600°C in a nitrogen atmosphere for 2 hours, and after cooling, an alumina-activated carbon composite carrier with a mass fraction of 20% activated carbon was obtained, marked as AAC.

[0017] Table 1: Carrier physical data

[0018] carrier name

[0019] carrier name

[0020] It can be seen from Table 1 that the composite ca...

Embodiment 2

[0022] This example is the preparation method of alumina-activated carbon composite carrier loaded Ni-Mo catalyst (marked as NiMo / AAC).

[0023] The loading of catalyst active components adopts co-impregnation method. 0.7 g Ni(NO 3 ) 2 ·6H 2 O and 3.62 g (NH 4 ) 6 Mo 7 o 24 4H 2 O was added to distilled water and vigorously stirred until completely dissolved, and then weighed 1.4 g of the alumina-activated carbon composite carrier prepared in Example 1 that was crushed to 40-60 mesh. Add the support to the prepared metal salt solution at room temperature. Soak for 24 hours at room temperature. The moisture was evaporated under reduced pressure, dried at 105°C for 3 hours, and then calcined at 400°C in a nitrogen atmosphere for 4 hours to obtain a Ni-Mo catalyst supported on an alumina-activated carbon composite carrier. where MoO 3 The loading amount is 21.06% (mass fraction), and the NiO loading amount is 8.94% (mass fraction).

Embodiment 3

[0025] This example is the evaluation method and result of the hydrodesulfurization activity of the catalyst of the present invention.

[0026] The hydrodesulfurization reaction is carried out on a stainless steel trickle bed reaction device. Weigh 1 gram of 40-60 mesh catalyst and 1 gram of quartz sand of the same particle size and mix it evenly, then add it to the middle of the reaction tube, and use quartz sand as support up and down. The catalyst was presulfided prior to the hydrodesulfurization reaction with 3% CS 2 / Decalin as vulcanizing agent, pressure 3.0MPa, liquid hourly space velocity 3.0h -1 , hydrogen oil ratio 500Nm 3 / m 3 . Then the temperature was raised from room temperature to 300°C at a rate of 10°C / min, and vulcanized at this temperature for 5 hours. Then cool down to the reaction temperature in a hydrogen atmosphere. The hydrodesulfurization activity of the catalyst was evaluated by switching the sulfurized oil to a 1wt% solution of dibenzothiophen...

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Abstract

The invention discloses an aluminum oxide-activated carbon composite carrier, a preparation method and a prepared catalyst. The carrier is characterized by having a specific surface area of 70 to 300 m<2> / g, a most probable pore diameter of 3 to 25 nm and the side compression strength of 80 to 200 N / mm; the activated carbon content of the carrier is 10 to 30 mass percent, while aluminum oxide content is 70 to 90 mass percent; and the carrier is prepared by kneading, molding and calcining aluminum oxide, activated carbon and an auxiliary material. The hydrogenation and desulfurization catalyst is prepared by loading Ni-Mo or Co-Mo or Ni-W onto the carrier by an impregnation method. The carrier of the invention has a well-developed mesopore structure and high mechanical strength. The catalyst of the invention has hydrogenation and desulfurization activity higher than that of the catalyst prepared by taking the aluminum oxide and the activated carbon independently as the carriers.

Description

technical field [0001] The invention relates to a preparation method of an alumina-activated carbon composite carrier and a petroleum fraction hydrogenation desulfurization catalyst prepared by using the carrier. Background technique [0002] The existence of sulfide in petroleum fractions has adverse effects on its subsequent processing and product application. The deterioration of crude oil and the increasingly stringent environmental protection regulations have lower and lower restrictions on the sulfur content in fuels, making the traditional hydrodesulfurization process face new challenges. Using catalysts with high hydrodesulfurization activity to deeply hydrotreat distillate oil is an effective way to solve the above problems. [0003] The performance of hydrodesulfurization catalysts largely depends on the support, and the interaction between active components and supports is one of the important factors affecting the performance of hydrodesulfurization catalysts. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/18B01J23/883B01J37/02C10G45/08
Inventor 徐绍平刘芳薛冬峰
Owner DALIAN UNIV OF TECH
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