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Alumina carrier with bimodal pore structure and preparation method thereof

A technology of alumina carrier and bimodal pores, which is applied in the field of alumina carrier with bimodal pore structure and its preparation, can solve the problems of inability to improve catalyst diffusion performance to the greatest extent, unavoidable pore blockage, reduction of carrier strength, and the like, Achieve the effect of reducing roasting energy consumption, reducing damage and improving product strength

Active Publication Date: 2020-07-17
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two patents have obtained a large number of macroporous structures, the mass of the pore-enlarging agent and binder used in them accounts for more than 10% of the mass of the raw material hydrated alumina. The mixture is burned out, and the resulting carrier strength is greatly reduced
[0009] The macropore diameter of the alumina carrier prepared by the above method is mostly concentrated below 500nm, and the content of macropores above 1000nm and above 2000nm is relatively low, which cannot avoid the clogging of the smaller pores and cannot maximize the diffusion performance of the catalyst.

Method used

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  • Alumina carrier with bimodal pore structure and preparation method thereof
  • Alumina carrier with bimodal pore structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Preparation of pseudoboehmite M 1 and M 2 . Determination of specific surface area and pore volume of pseudoboehmite by nitrogen adsorption method, M 1 The specific surface area is 184m 2 / g, the pore volume is 2.1mL / g, and the most probable pore diameter is 40.8nm; M 2 The specific surface area is 420m 2 / g, the pore volume is 1.3mL / g, and the most probable pore diameter is 18.6nm.

[0049] Weigh the above-mentioned pseudo-boehmite M 1 50g (dry basis), pseudo-boehmite M 2 50g (dry basis), add 3g of asparagus powder, dissolve 1.8g of boric acid and 0.8g of polyoxyethylene ether in 110g of deionized water, add to the aforementioned materials, knead and extrude into a cylinder with a diameter of 2.5mm on a single-screw extruder shape, dried at 105°C for 4 hours, and then calcined at 800°C for 4 hours to obtain alumina carrier A, whose properties are shown in Table 1.

Embodiment 2

[0051] Preparation of pseudoboehmite M 1 and M 2 . Determination of specific surface area and pore volume of pseudoboehmite by nitrogen adsorption method, M 1 The specific surface area is 178m 2 / g, the pore volume is 2.2mL / g, and the most probable pore diameter is 34.6nm; M 2 The specific surface area is 400m 2 / g, the pore volume is 1.3mL / g, and the most probable pore diameter is 17.0nm.

[0052] Weigh the above-mentioned pseudo-boehmite M 1 60g (dry basis), pseudo-boehmite M 2 40g (dry basis), add 2.0g of asparagus powder and 1.0g of boron oxide, dissolve 1g of polyoxyethylene ether in 107g of deionized water, add to the aforementioned materials, knead and extrude on a single-screw extruder into diameter 3.0mm Four-leaf clover shape, dried at 120°C for 3 hours, and then calcined at 600°C for 5 hours to obtain alumina carrier B, whose properties are shown in Table 1.

Embodiment 3

[0054] Preparation of pseudoboehmite M 1 and M 2 . Determination of specific surface area and pore volume of pseudoboehmite by nitrogen adsorption method, M 1 The specific surface area is 230m 2 / g, the pore volume is 3.0mL / g, and the most probable pore diameter is 51.5nm; M 2 The specific surface area is 410m 2 / g, the pore volume is 1.4mL / g, and the most probable pore diameter is 18.0nm.

[0055] Weigh the above-mentioned pseudo-boehmite M 1 70g (dry basis), pseudo-boehmite M 2 30g (dry basis), add 3g of asparagus powder, dissolve 1.6g of boric acid and 1.4g of polyoxyethylene ether in 110g of deionized water, add to the aforementioned materials, knead and extrude into a clover with a diameter of 3.0mm on a single-screw extruder shape, dried at 110°C for 4 hours, and then calcined at 750°C for 4 hours to obtain alumina carrier C, whose properties are shown in Table 1.

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Abstract

The invention discloses an alumina carrier with a bimodal pore structure of a heavy oil hydrogenation catalyst and a preparation method of the alumina carrier. The pore volume of the alumina carrier is 0.8-1.5 mL / g, the specific surface area is 120-350m<2> / g, the most probable pore diameter of mesopores is 15-30nm, the most probable pore diameter of macropores is 2000-4000nm, and the pore volume of macropores of 2400 nm or above accounts for 5-25% of the total pore volume. The alumina carrier provided by the invention has the advantages of large pore volume, large pore diameter and excellent diffusivity, and is suitable for being used as a hydrogenation catalyst alumina carrier for treating colloid and heavy oil with high asphaltene content.

Description

technical field [0001] The invention relates to an alumina carrier suitable for heavy oil hydrogenation and a preparation method thereof, more specifically to an alumina carrier with a bimodal pore structure and a preparation method thereof. Background technique [0002] Coal tar is a valuable chemical raw material obtained in the process of coal pyrolysis and gasification. With the rapid development of low-rank coal pyrolysis technology, the production of medium and low temperature coal tar has increased significantly. Medium and low temperature coal tar contains more alkanes, cycloalkanes and less condensed ring aromatics, and is suitable for the production of clean fuel oil and high value-added chemicals through hydrogenation. [0003] Residual oil is the most difficult raw material to process among petroleum-based heavy oils. It contains a large amount of colloids and asphaltenes. This part of the substance has a large molecular weight, complex structure, and difficult ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J35/10B01J37/08B01J37/00C01F7/02C01F7/30C10G45/04C04B35/10C04B35/622C04B38/06C04B38/02
CPCB01J21/04B01J37/0018B01J37/082C10G45/04C04B35/10C04B35/622C04B38/067C04B38/02C01F7/306C01F7/02C04B2235/6021C04B2235/656C04B2235/6567C04B2235/95C04B2235/96B01J35/615B01J35/635B01J35/638B01J35/657B01J35/647
Inventor 吴艳马博文李文博陈贵锋孙仲超黄澎常秋连高明龙
Owner CCTEG CHINA COAL RES INST
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