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Preparation method of alumina support

An alumina carrier, alumina technology, applied in catalyst carriers, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve problems such as low specific surface area

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Larger pores are required for diffusion in order to inhibit the deposition of sediment on the orifice, but larger pores usually mean lower specific surface area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Pretreatment of activated carbon fibers. 10 grams of activated carbon fibers of 100-150 mesh after grinding, the specific surface area is 856 m 2 / g, immersed in the aluminum nitrate solution with a concentration of 5wt%, until the adsorption equilibrium. After the adsorbed activated carbon fibers were filtered, they were dried in the shade at room temperature, and then dried at 60° C. for 10 hours. After drying, repeat the process of impregnation, adsorption and drying for 3 times. The activated carbon fiber of gained is denoted as ACF1;

[0027] Similarly, the properties and pretreatment conditions of activated carbon fibers are shown in Table 1.

[0028] Table 1 Properties and pretreatment conditions of activated carbon fibers

[0029] Mesh number specific surface area * , m 2 / g Aluminum nitrate concentration, wt% Drying temperature and time, ℃ / h repeat times ACF1 100~150 856 5 60 / 10 3 ACF2 150~200 930 15 60 / 10 3 A...

Embodiment 2

[0032] 100 grams of pseudo-boehmite dry rubber powder, 10 grams of activated carbon fiber ACF1, and 5 grams of scallop powder. After mixing evenly in a dry state, gradually add 140 ml of dilute nitric acid with a concentration of 3.5 wt%, and then move it into the extruder and After kneading into a plastic body, extrude into strips. After drying overnight at room temperature, the extrudate was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 550°C at a rate of 10°C / hour, kept at this temperature for 6 hours, and cooled naturally to prepare an alumina carrier.

Embodiment 3

[0034]150 grams of pseudo-boehmite dry rubber powder, 15 grams of activated carbon fiber ACF2, and 4 grams of scallop powder. After mixing evenly in a dry state, gradually add 140 ml of dilute nitric acid with a concentration of 3.5 wt%, and then move it into the extruder to fully After kneading into a plastic body, extrude into strips. After drying overnight at room temperature, the extrudate was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 650°C at a rate of 10°C / hour, kept at this temperature for 6 hours, and cooled naturally to prepare an alumina carrier.

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PUM

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Abstract

The invention discloses a preparation method of an alumina support. The method comprises the steps of enabling activated carbon fibers with developed pore structures to adsorb inorganic aluminium salts through dipping and then using the activated carbon fibers as pore-enlarging agents, kneading and forming the activated carbon fibers with an alumina precursor, and then drying and roasting the product, thus obtaining the alumina support. The alumina support prepared by the method is higher in specific surface area, more concentrated in pore size distribution and high in mechanical strength, also contains part of macropores with sizes more than 100nm, is suitable for preparing heavy / residual oil hydrogenation catalysts, and is favorable for removing macromolecular impurities in heavy / residual oil and delaying the increase of diffusion resistance in heavy / residual oil hydrogenation, thus being favorable for maintaining the activities of the hydrogenation catalysts and lengthening the running period.

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 large pore volume and high specific surface area. Background technique [0002] As crude oil becomes increasingly heavy and inferior, oil refineries are faced with a large number of problems in the processing and utilization of heavy and residual oil. There are a large amount of organometallic compounds such as nickel, vanadium and iron and asphaltenes in heavy and residual oils. The above metals and asphaltenes will cause the blockage of the pores of the catalyst bed and reduce the life of the catalyst. Extensive metal deposits on the catalyst tend to poison or deactivate the catalyst. In addition, asphaltenes tend to reduce the sensitivity of hydrocarbon desulfurization, and for hydrodesulfurization catalysts, if acted on hydrocarbon feeds containing metals and asphaltenes, the catalyst will deactivate rapidly and requi...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J35/10C01F7/02
Inventor 杨卫亚沈智奇凌凤香王少军王丽华季洪海郭长友
Owner CHINA PETROLEUM & CHEM CORP
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