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Preparation method of alumina carrier

A technology of alumina carrier and pseudo-boehmite, which is applied in the direction of alumina/aluminum hydroxide, can solve the problems of complex operation process and high temperature of hydrothermal treatment

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the preparation of macroporous alumina supports by hydrothermal treatment generally has the disadvantages of high hydrothermal treatment temperature and complicated operation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Weigh 100g pseudo-boehmite dry rubber powder (produced by Shenyang Catalyst Factory, alumina dry basis content 65%), and mix it with a urea solution with a mass concentration of 30% to make the amount of urea and pseudo-boehmite material equal The ratio is 2:1, the mixture is transferred to an autoclave, and the autoclave is sealed and heated to a constant temperature of 160°C for 6 hours; the pseudo-boehmite after hydrothermal treatment is mixed with 2g sesame powder and an appropriate amount of aqueous solution containing 3g nitric acid. , Forming a plastic material; extruding and molding through an extruder; drying the formed strip wet material at 120°C for 3 hours; calcining the dried shape at 700°C for 3 hours to obtain an alumina carrier. The pore volume of the obtained alumina support 10nm-20nm pores accounted for 81% of the total pore volume, and the specific surface area of ​​the support was 263 m 2 / g.

example 2

[0028] The same as Example 1, except that an aqueous solution of urea with a mass concentration of 40% was added so that the ratio of urea to pseudo-boehmite was 4:1, and the sealed autoclave was heated to a constant temperature of 130°C for 4 hours. The resulting alumina carrier 10nm-

[0029] The pore volume of 20nm pores accounts for 78% of the total pore volume, and the specific surface area of ​​the carrier is 239m 2 / g.

example 3

[0031] The same as in Example 1, except that an aqueous solution of urea with a mass concentration of 50% was added so that the ratio of urea to pseudo-boehmite was 3:1, and the sealed autoclave was heated to a constant temperature of 150°C for 8 hours. The pore volume of the obtained alumina support 10nm-20nm pores accounted for 83% of the total pore volume, and the specific surface area of ​​the support was 242m 2 / g.

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PUM

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Abstract

The invention discloses a preparation method of an alumina carrier. The method includes the following steps: weighing a proper amount of a pseudo-boehmite dry powder, mixing with a urea aqueous solution, carrying out hydrothermal treatment with the water temperature at 100-200 DEG C on the mixed materials in a sealed container for 1-10 h, and after hydrothermal treatment forming, drying and roasting the materials to obtain the alumina carrier. The method has simple operation process, and can prepare alumina carrier with concentrated pore distribution and high specific surface area in low temperature hydrothermal treatment conditions.

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 concentrated pore distribution and high specific surface area. Background technique [0002] At present, in the production process of heavy oil hydrodemetalization, because the raw oil contains a certain amount of vanadium, sulfur, arsenic, nickel and other impurities, it is easy to form deposits, which block the pores of the catalyst and cause the catalyst activity to drop rapidly. Even inactivation, affecting industrial applications. The catalyst with larger pore volume and larger pore size has strong metal and carbon capacity, which can slow down the deactivation of the catalyst and prolong the operation period of the catalyst. The pore structure of the catalyst is determined by the carrier constituting the catalyst. Therefore, the preparation of a carrier with a larger pore volume and a larger pore diameter is the preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 季洪海沈智奇凌凤香王少军杨卫亚王丽华郭长友
Owner CHINA PETROLEUM & CHEM CORP