A preparing method of large-pore diameter aluminium oxide

A technology of alumina and large pore size, applied in chemical instruments and methods, alumina/aluminum hydroxide, inorganic chemistry, etc., can solve the problems of complex process of separating aluminum hydroxide, high cost of industrial application, increased cost, etc. The effect of easy large-scale industrial production, convenient and flexible control of product properties, and cost saving

Active Publication Date: 2015-02-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of separating aluminum hydroxide by this method is more complicated, and the amount of organic solvent added is higher, which increases the cost, and there is a runaway temperature during high-temperature roasting, the temperature control is complicated, and the cost of industrial application is higher.

Method used

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  • A preparing method of large-pore diameter aluminium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 70 g of pseudo-boehmite powder (produced by Changling Catalyst Factory, with an alumina dry basis content of 70%) and add it to a 1-liter three-neck flask, add 441 g of deionized water, and stir to form an aluminum hydroxide suspension with a solid content of 10% by mass liquid. The suspension was kept at 60°C for 3 hours and then at 90°C for 3 hours. After the treatment, 160g of deionized water was evaporated by heating, and the slurry was transferred to a 200ml stainless steel pressure tank lined with polytetrafluoroethylene, and aged in an oven at 120°C for 6 hours. After aging, the obtained thin water aluminum The stone was dried in an oven at 120°C for 6 hours. The obtained boehmite was calcined at 600°C for 6 hours to obtain γ-Al 2 o 3 Product A, its pore diameter, pore volume and specific surface area are shown in Table 1.

Embodiment 2

[0027] Repeat the steps of Example 1, changing the aluminum hydroxide suspension to a constant temperature of 130°C and 160°C for 3 hours, and keeping other conditions unchanged, the obtained boehmite was roasted at 600°C for 6 hours to obtain γ-Al 2 o 3 Product B, its pore diameter, pore volume and specific surface area are shown in Table 1.

Embodiment 3

[0029] Repeat the steps of Example 1, instead place the aluminum hydroxide suspension at 90°C, 120°C, and 150°C for 3, 3, and 4 hours, respectively, and keep other conditions unchanged. The obtained boehmite was roasted at 600°C for 6 hours to obtain γ- al 2 o 3 Product C, its pore diameter, pore volume and specific surface area are shown in Table 1.

[0030] Table 1 The physical and chemical properties of alumina products

[0031]

[0032] It can be seen from Table 1 that with the difference of treatment temperature and treatment time, the pore structure of the product changes regularly: as the treatment temperature increases, the average pore diameter of the product increases, the pore volume decreases, and the specific surface decreases. In this way, the controllable adjustment of the physical properties of the product can be further realized.

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Abstract

The invention relates to a preparing method of large-pore diameter aluminium oxide. The method includes: dissolving boehmite, pseudo boehmite or a mixture of boehmite and pseudo boehmite by any ratio into deionized water to form an aluminium hydroxide suspension liquid; performing stage heating treatment, with an initial temperature being 30-120 DEG C, a temperature gradient being 30-50 DEG C, and the treating time in each temperature state being 2-6 h; subjecting the treated aluminium hydroxide suspension liquid to hydrothermal ageing; and drying and calcinating after ageing is finished to finally obtain a large-pore diameter aluminium oxide product. The average pore size of the product is 90-300 angstroms, the most probable pore diameter is 90-280 angstroms, pore volume is 0.3-1.0 mL/g, and the specific surface area is 100-300 m<2>/g. The product has advantages of a large pore diameter, large pore volume, large specific surface area, easy adjustable product properties, and the like, and can be further processed into a catalyst carrier or an adsorbent having excellent performance.

Description

technical field [0001] The invention relates to a large-pore-diameter aluminum hydroxide and a method for preparing the large-pore-diameter alumina obtained by roasting the same. The alumina product has large pore size, large pore volume and high specific surface area, and can be used as a catalyst carrier or adsorbent with excellent performance. Background technique [0002] As one of the main raw materials in the ceramic industry, alumina has always been a material that has attracted much attention. It has more than ten low-temperature metastable crystal forms, each crystal form has different physical and chemical properties, and is widely used in aerospace, electronics, chemical industry, medicine, catalysts and their carriers, refractory materials, insulating materials, fillers, semiconductor processing, Ceramics, machinery, metallurgy and other fields. With the development of science and technology, people have increasingly stringent requirements on material performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/441
Inventor 胡亚琼兰玲袁晓亮杨彦鹏金辰王书芹刘坤红葛少辉鞠雅娜张学军侯远东王鹏鲁旭
Owner PETROCHINA CO LTD
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