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Preparation method of boron-modified alumina carrier

An alumina carrier and boron modification technology, applied in catalyst carriers, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of small specific surface area and pore volume of boron-containing alumina, uneven boron dispersion, etc. The preparation method is simple, the process is simple, and the cost is low.

Active Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also adopts the kneading method to introduce boric acid and add peptizer to shape, so there are also problems such as uneven dispersion of boron, additional peptizing acid is needed to shape, and the specific surface area and pore volume of boron-containing alumina are small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 100 grams of pseudo-boehmite dry rubber powder, with ethanol as a wetting agent, its saturated adsorption value is determined to be 250 grams. Take 100 grams of dry rubber powder and 3 grams of Sesbania powder. After mixing them evenly, gradually add 150 grams of ethanol and keep stirring until uniform. The boron-containing solution is then gradually added to the wet alumina precursor described above. The composition of the solution is as follows: 14.6 grams of sorbitol, 2.53 grams of boric acid, and 145 grams of water. The three are mixed and heated appropriately to completely dissolve them. After the mixture is basically stirred into a dough, it is then moved into the extruder to be fully kneaded into a plastic body, and then extruded into a strip. After the extrudate was dried overnight at room temperature, it was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 550°C, and calcined at a constant temperature at this tem...

Embodiment 2

[0031] 100 grams of pseudo-boehmite dry glue powder and 3 grams of sesbania powder are mixed evenly in a dry state, and then 130 grams of 50v% ethanol solution is gradually added and stirred until uniform. Then add the boron-containing solution. The composition of the solution is as follows: 11.4 grams of glycerin, 3.84 grams of boric acid, and 145 grams of water. The three are mixed, under constant stirring, and appropriately heated to make them completely dissolved. After the mixture is basically stirred uniformly, it is then moved into the extruding machine to be fully kneaded into a plastic body, and then extruded into a strip shape. After the extrudate was dried overnight at room temperature, it was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 650°C, and calcined at a constant temperature at this temperature for 6 hours, and naturally cooled to prepare the boron-modified alumina carrier. The physical and chemical propert...

Embodiment 3

[0033] 100 grams of pseudo-boehmite dry glue powder and 3 grams of sesame powder, after mixing uniformly in a dry state, gradually add 80 grams of ethanol and continue stirring until uniform. Then add the boron-containing solution. The composition of the solution is as follows: 40 grams of xylitol, 5.86 grams of boric acid, and 136 grams of water. The three are mixed, under constant stirring, under constant stirring, and appropriate heating to make them completely dissolved. After the mixture is basically stirred uniformly, it is then moved into the extruding machine to be fully kneaded into a plastic body, and then extruded into a strip shape. After the extrudate was dried overnight at room temperature, it was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 650°C, and calcined at a constant temperature at this temperature for 6 hours, and naturally cooled to prepare the boron-modified alumina carrier described in this patent. T...

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PUM

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Abstract

The invention relates to a preparation method of a boron-modified alumina carrier. The method comprises the following steps of: firstly wetting an alumina precursor by the use of a low carbon alcoholic solution, adding a boron-containing solution formed by polyol and boric acid, and preparing the boron modified alumina carrier. By the adoption of the method, local supersaturation adsorption phenomenon caused by directly adding the boron-containing solution into the alumina precursor can be avoided, and the solution will not be over-absorbed into internal pores. Simultaneously, with the increase of the temperature during the kneading process, volatilization of low carbon alcohol and low surface tension help boron to uniformly disperse onto the surface of the alumina carrier. In addition, the method is beneficial to improving specific surface area and pore volume of the carrier. The boron modified alumina carrier provided by the invention is especially applicable to being used as a carrier for a hydrodenitrogenation catalyst.

Description

Technical field [0001] The invention relates to a preparation method of a boron-modified alumina carrier, which belongs to the field of inorganic material preparation. Background technique [0002] Hydrorefining is an important means to remove sulfur, nitrogen, oxygen and other organic substances from oil products through catalytic hydrogenation. At present, an important aspect in the research of hydrorefining catalysts is to adopt a variety of methods to modify the alumina support used in the preparation of catalysts to obtain catalytic materials with good performance. [0003] As a catalytic support material, alumina has a very wide range of applications in the field of hydrogenation. However, when alumina is used as a catalyst carrier, the acidity is weak, and it easily interacts with active metal components to form inactive species. Therefore, simply using alumina as a catalyst carrier is prone to sintering of the active metal components or the carrier, which affects the acti...

Claims

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Application Information

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IPC IPC(8): B01J21/04B01J32/00B01J35/10C10G45/04
Inventor 王少军杨卫亚凌凤香沈智奇孙万付
Owner CHINA PETROLEUM & CHEM CORP
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