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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 complex separation and recovery process, high production cost, unfavorable for large-scale industrial production, and the like, and achieves a high technological Simple, saving raw materials, and easy to achieve the effect of large-scale industrial production

Active Publication Date: 2011-04-27
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 method for preparing macroporous alumina provided by the present invention includes the following steps:

[0016] (1) Prepare the precursor of alumina into a suspension or sol with a solid content of 2-20% by mass, and age it at 10-90°C.

[0017] (2) The solid content of the aging slurry in step (1) is concentrated to 25-45% by mass, aged at 100-220°C, then dried and calcined.

[0018] The step (1) of the above method is a section of aging of the suspension or sol prepared from the precursor of alumina, the precursor of 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 or organic acid to the suspension to make it 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 for preparing the sol can ...

example 1

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

example 2

[0028] Prepare γ-Al 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 resulting boehmite is dried and calcined to obtain γ-Al 2 O 3 B, the 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 percent 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, specifically, an alumina having a 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 physical properties, and is widely used in electronics, chemicals, medicine, machinery, aerospace, metallurgy and other fields. Γ-Al called "activated alumina" 2 O 3 , Due to its porous high dispersion, high specific surface area, good adsorption and surface acidity, and low price and easy availability, it is often used as a catalyst carrier for petrochemical processes such as hydrogenation, dehydrogenation, desulfurization and cracking. One of the most commonly used catalyst carriers in industry. [0003] As the carrier alumina, its pore structure has an important influence on the activity, selectivity and life of the catalyst. The alumina support with a bimodal pore size distributio...

Claims

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Application Information

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Patent Type & Authority Applications(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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