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Macroporous aluminum oxide with bimodal pore distribution and preparation method thereof

A technology of macroporous alumina and bimodal pores, which is applied in the field of alumina with bimodal pore distribution and its preparation, can solve the problems of high production cost, unfavorable for large-scale industrial production, complicated separation and recovery process, etc., and saves Raw materials, easy large-scale industrial production, simple process effect

Active Publication Date: 2012-08-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a large amount of organic solvents in the drying process, the separation and recovery process is complicated, and the production cost is high, which is not conducive to large-scale industrial production

Method used

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  • Macroporous aluminum oxide with bimodal pore distribution and preparation method thereof
  • Macroporous aluminum oxide with bimodal pore distribution and preparation method thereof
  • Macroporous aluminum oxide with bimodal pore distribution and preparation method thereof

Examples

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preparation example Construction

[0015] The preparation method of macroporous alumina provided by the present invention comprises the following steps:

[0016] (1) The precursor of alumina is prepared into a suspension or sol with a solid content of 2-20% by mass, aged at 10-90°C,

[0017] (2) Concentrating the solid content of the aged slurry in step (1) to 25-45 mass %, aging at 100-220° C., then drying and calcining.

[0018] The above-mentioned method (1) step is a one-stage aging of the suspension or sol obtained by the precursor of alumina, and the precursor of the alumina is selected from boehmite, pseudo-boehmite or boehmite and pseudo-boehmite. A mixture of boehmite. Before aging, add water to the alumina precursor to make a suspension with a specified solid content, or add an appropriate amount of inorganic acid or organic acid to the suspension to make it into a sol. The pH of the suspension or sol before aging is 3-9, the pH of the suspension is 7-9, and the pH of the sol is 3-6. The acid used ...

example 1

[0026] Get 100g pseudo-boehmite powder (produced by Changling Catalyst Factory, alumina content 70% by mass) and add it in the three-necked flask of 1 liter, add 483.3g deionized water, stir to form the suspension that solid content is 12.0% by mass, pH value 9.0, aged at 60°C for 12 hours. 350 g of deionized water was removed by heating and evaporation, and the obtained slurry with a solid content of 30.0% by mass was transferred to a 250 ml stainless steel pressure tank lined with Teflon, heated to 120° C. and aged for 12 hours. The obtained boehmite was dried at 120°C for 6 hours and calcined at 600°C for 6 hours to obtain γ-Al 2 O 3 A, its specific surface area, pore volume and pore distribution are shown in Table 1.

example 2

[0028] γ-Al was prepared according to the method of Example 1 2 O 3, the difference is that the first stage of aging is carried out at 30 °C for 12 hours, and the second stage of aging is carried out at 150 °C for 12 hours. The obtained boehmite is dried and calcined to obtain γ-Al 2 O 3 B, its specific surface area, pore volume and pore distribution are shown in Table 1.

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PUM

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Abstract

The invention discloses macroporous aluminum oxide with bimodal pore distribution. The pore volume of the macroporous aluminum oxide is 0.6 to 3.0ml / g, the specific surface area is 90 to 300sq.m / g, wherein the pores with aperture of between 35 and 100 angstroms account for 20 to 55 percent of the total pore volume, and the most probable aperture is between 50 and 90; and the pores with aperture of between 200 and 800 angstroms account for 20 to 55 percents of the total pore volume, and the most probable aperture is between 300 and 600. The aluminum oxide is prepared by a two-section aging method without a hole expansion agent or an organic solvent, so the raw materials are saved, the flow is simplified, and the production cost is greatly reduced.

Description

technical field [0001] The present invention is an alumina and a preparation method thereof, in particular, an alumina with bimodal pore distribution and a preparation method thereof. Background technique [0002] Alumina has a variety of crystal forms, and each crystal form has different special properties, and is widely used in electronics, chemical industry, medicine, machinery, aerospace, metallurgy and other fields. γ-Al2O3, known as "activated alumina", is often used for hydrogenation, dehydrogenation, The catalyst carrier for petrochemical processes such as desulfurization and cracking is one of the most commonly used catalyst carriers in industry. [0003] The pore structure of alumina as a carrier has an important influence on the activity, selectivity and life of the catalyst. Alumina supports with bimodal pore size distribution have great advantages in solid-phase catalytic reactions: large pores are conducive to the full contact between reactant molecules and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 杨彦鹏蔡迎春马爱增
Owner CHINA PETROLEUM & CHEM CORP
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