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Boron-containing alumina carrier and preparation method thereof

A technology of alumina carrier and aluminum hydroxide, which is applied in the field of preparation of boron-containing alumina carrier, can solve the problem of small increase in alumina pore volume and specific surface area, loss of catalyst strength and specific surface area, reduction of catalyst activity and service life and other problems, to achieve the effects of favorable interaction, improved anti-coking or anti-coke performance, suitable pore structure and acidity

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts the strong acidity of ammonium fluoroborate or boron trifluoride, which will seriously lose the strength and specific surface area of ​​the catalyst, and the activity of the catalyst will be greatly reduced, and the compound containing fluorine and boron is poisonous, which not only deteriorates the working environment, but also It is very easy to corrode the equipment and cause serious pollution to the environment
In addition, this method needs to be heated to 50-90°C when mixing, the operation process is complicated, and the production cost is increased.
However, if boric acid is used at room temperature, boric acid is easy to precipitate, resulting in poor dispersion of boron in alumina, and when the boron content exceeds 2%, most of it will be converted into inactive tetrahedral coordination B
Using boric acid as an auxiliary agent, although it can play a role in pore expansion, the pore volume and specific surface area of ​​the obtained alumina will not increase much, and if the operating conditions are not properly controlled, or the boron content is not properly controlled, it will also affect the aluminum hydroxide. Gelling, which in turn makes the strength of the alumina carrier and the prepared catalyst worse, and reduces the activity and service life of the catalyst

Method used

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  • Boron-containing alumina carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] will contain Al 2 o 3 5g100mL of AlCl 3 Solution 2000mL with NH 3 10g / 100mL of ammonia water was added dropwise into the gelling reaction tank stirred at a temperature of 60°C, and the pH value was maintained at 7.6, and the reaction contact time was 40min. After gelation reaction, add B 2 o 3 3g / 100mL organic compound solution 100mL. The boron-containing organic compound solution is prepared by dissolving boric acid in water, and then the molar ratio of boric acid to mannitol is 1:1. Aging was then carried out at a temperature of 70°C and a pH of 8.0. The aging time is 1h. The product was filtered, and then washed with deionized water with a solid-to-liquid volume ratio of 1:20 at a washing temperature of 80° C. for three times. The obtained filter cake was dried at 120° C. for 3 hours to obtain aluminum hydroxide dry gel.

[0026] Take 120g of the above-mentioned boron-containing aluminum hydroxide, mix it with 126g of binder prepared by peptizing SB alumi...

Embodiment 2

[0028] The boron-containing organic compound solution in Example 1 was replaced by the boric acid to ethylene glycol molar ratio of 1.0:1.5, and other aluminum hydroxide dry glue was prepared in the same way as in Example 1 to obtain boron-containing aluminum hydroxide.

[0029] Take 110g of the above-mentioned boron-containing aluminum hydroxide, mix it with 118g of binder prepared by peptizing SB alumina powder with nitric acid, knead for 20min, make a plastic paste, and extrude it through a clover orifice plate with a diameter of 1.4mm. After the wet bar is dried at 130°C for 8 hours, the temperature is raised to 190°C at a rate of 2°C / min, and roasted at this temperature for 1 hour; then the temperature is raised to 370°C at a rate of 3°C / min, and roasted at this temperature for 2 hours, and then The temperature was raised to 520° C. at a rate of 2° C. / min, and calcined at this temperature for 2 hours to obtain a carrier S-2.

Embodiment 3

[0031] The boron-containing organic compound solution in Example 1 was replaced by the boric acid to glycerol molar ratio of 1.5:1.0, and other aluminum hydroxide dry glue was prepared in the same way as in Example 1 to obtain boron-containing aluminum hydroxide.

[0032] Take 95g of the above-mentioned boron-containing aluminum hydroxide, mix it with 102g of binder prepared by peptizing SB alumina powder with nitric acid, knead for 20 minutes, make a plastic paste, and extrude it through a clover orifice plate with a diameter of 1.4mm. After the wet strip was dried at 130°C for 8 hours, the temperature was raised to 200°C at a rate of 3°C / min, and roasted at this temperature for 2 hours; then the temperature was raised to 360°C at a rate of 3°C / min, and roasted at this temperature for 1 hour, and then The temperature was raised to 520° C. at a rate of 3° C. / min, and calcined at this temperature for 2 hours to obtain a carrier S-3.

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Abstract

The invention discloses a preparation method of a boron-containing alumina carrier. The method comprises the following steps of: gelling the conventional aluminum hydroxide; adding into a stable boron-containing organic compound solution; aging, filtering, washing and drying to obtain dry boron-containing aluminum hydroxide gel; mixing and molding with an adhesive; and heating and performing gradual programmed heating and baking to obtain the boron-containing alumina carrier. Boron-containing alumina is a high-performance carrier component, which can be used for providing a large pore volume and a large specific surface area, has an appropriate pore structure and acidity, and is particularly suitable for a catalyst material needed by a heavy hydrocarbon catalytic processing process.

Description

technical field [0001] The invention relates to a method for preparing a boron-containing alumina carrier, in particular to a method for preparing a macroporous boron-containing alumina with certain acidity. Background technique [0002] Alumina has the characteristics of good thermal stability, many micropores, good strength, and high water absorption. It is an ideal carrier component for preparing various supported catalysts, and is widely used in petroleum, chemical and other industries. In practical applications, catalytic promoter components, such as boron, are usually added to improve the pore structure, specific surface and acid properties of alumina, improve the dispersion of active metals and the interaction between active metals and supports, so as to improve the catalytic activity of the catalyst. Reaction performance, improve anti-coking or anti-coking performance, prolong the service life of the catalyst. [0003] At present, the preparation methods of boron-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/04B01J35/10
Inventor 王敏汤涛凌凤香孙万付
Owner CHINA PETROLEUM & CHEM CORP
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