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A boron-containing alumina carrier and its preparation method

A technology of alumina carrier and aluminum hydroxide, which is applied in the direction of catalyst carrier, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of small increase in alumina pore volume and specific surface area, poor boron dispersion, and operating process Complicated problems, to achieve the effect of improving anti-coking or anti-coking performance, suitable pore structure and acidity, and simple preparation method

Active Publication Date: 2016-02-24
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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  • A boron-containing alumina carrier and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] will contain Al 2 o 3 5g / 100mL 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. Aging was performed 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.

[0029] Take 100g of the above aluminum hydroxide dry glue, mix it with 110g of adhesive 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 strip was dried at 130°C for 8h, it was calcined at 520°C for 4h to obtain alumina carrier S-1.

Embodiment 2

[0031] After the gelling reaction of Example 1, add the 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. The preparation of other aluminum hydroxide dry glue is the same as in Example 1 to obtain boron-containing aluminum hydroxide.

[0032] Take 120g of the above-mentioned boron-containing aluminum hydroxide, mix it with 126g 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 strip was dried at 130°C for 8h, it was calcined at 520°C for 4h to obtain carrier S-2.

Embodiment 3

[0034] The boron-containing organic compound solution in Example 2 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 2 to obtain boron-containing aluminum hydroxide.

[0035]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 strip was dried at 130°C for 8h, it was calcined at 520°C for 4h to obtain carrier S-3.

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Abstract

The invention discloses a boron-containing alumina carrier and a preparation method thereof. The method is that after the conventional gel-forming process of alumina, a stable boron-containing organic compound solution is added so as to introduce the adjuvant, namely boron. The boron-containing alumina carrier disclosed by the invention has large pore volume and specific surface area, and proper pore structure and acidity, and is especially suitable for the catalyst material used in the catalytic processing of the heavy hydrocarbon.

Description

technical field [0001] The invention relates to a boron-containing alumina carrier and a preparation method thereof, in particular to a boron-containing alumina carrier with a large pore volume and a large specific surface and a preparation method thereof. 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 promoters, such as boron, are usually added to improve the pore structure, specific surface and acid properties of alumina, thereby improving the dispersion of active metals and the interaction between active metals and supports. Reaction performance, improve anti-coking or anti-coking performance, prolong the service life of the catalyst. [0003] At present, the preparation methods of boron-containing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/04B01J35/10
Inventor 王敏凌凤香王丽君孙万付
Owner CHINA PETROLEUM & CHEM CORP
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