A silicone modified aluminum hydroxide solid elastomer and preparation method thereof

A technology of aluminum hydroxide and silicon modification, applied in chemical instruments and methods, catalyst carriers, chemical/physical processes, etc., can solve the problems of limited pore expansion, increase of specific surface area, loss of specific surface area, etc., and achieve the preparation method Simple, increase specific surface area, effect of large specific surface area

Active Publication Date: 2007-04-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical method is usually to add additives in the process of alumina preparation. For example, patent 94107295.9 adds sodium silicate modified alumina after gelling; patent CN1030395C proposes to mix silica sol into pseudo-boehmite, which can play a role in hole expansion. effect, but the hole expansion effect is limited and there is a problem of uneven distribution of silicon
[0004] The modifi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] (1)AlCl 3 Solution preparation: react general alumina with hydrochloric acid at 90-120°C, remove iron with activated carbon, so that Fe / Al by weight 2 o 3 value is less than 0.005%, the preparation of refined AlCl 3 solution, and then diluted to a concentration of 10 to 60g Al 2 o 3 / L can be used as the working fluid for gelling.

[0019] Preparation of ammonia water: add liquid ammonia to still water to dissolve into ammonia water, and make NH 3 It is 80-200g / L ammonia water.

[0020] (2) Gelling process: the AlCl 3 The solution and ammonia water are added to the gelling tank at a certain flow rate at the same time, and stirred. The gelling time is controlled at 60-100 minutes, and the gelling reaction temperature is controlled at 40-80°C, preferably at 60-80°C. The pH value of the reaction process is controlled within the range of 4.5-9.5. After the gel forming reaction, the organic silicon solvent is added dropwise, and then the slurry is aged, the temperatu...

example 1

[0024] will contain Al 2 o 3 5g / 100ml of AlCl 3 Solution 2000ml with NH 3 10g / 100ml of ammonia water was added dropwise to the gelling reaction tank with stirring temperature at 68°C, keeping the pH value at 8.0, and the reaction contact time was 40min. Aging was carried out at a temperature of 75°C and a pH value of 9.0. The aging time was 1.5 hours. The product was filtered, and then washed with deionized water with a solid-to-liquid ratio of 1:20 at a washing temperature of 70° C. for 3 times. The resultant was filtered and dried at 120 °C for 3 h.

example 2

[0026] After the gel-forming reaction of Example 1, dropwise add 2 100ml of 6g / 100ml dilute water glass solution. Others are the same as example 1.

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PUM

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Abstract

The invention relates to a method for preparing aluminum hydroxide wafer which is modified by silicon. Wherein, said wafer is baked and converted into silicon-modified gamma-Al203, to obtain following properties, that specific surface area is 400-600m2/g, the hole capacity is 1.0-2.0cm3/g, and the silica mass percentage is 2%-20%. In its preparation, after the neutralization between acid aluminum salt solution and alkali compound solution, it adds organic silicon to age, and composite via general steps. The invention has simple method.

Description

technical field [0001] The invention relates to a silicon-modified aluminum hydroxide and a preparation method thereof. In particular, the pore volume and specific surface area of ​​aluminum oxide are greatly improved after the introduction of a specific silicon-containing additive. technical background [0002] In the field of catalysis, how to prepare high-efficiency catalysts with high activity, excellent selectivity and long life has always been a subject of concern and attention. For catalysts that support active components on a carrier, although the carrier itself usually does not have direct catalytic activity, the catalytic components can only exert their catalytic performance stably by relying on a carrier with suitable performance. Using a carrier with a high specific surface area can prepare a highly dispersed supported catalyst, thereby improving the reaction performance of the catalyst; having a larger pore volume in the catalyst will improve its anti-coking or ...

Claims

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Application Information

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IPC IPC(8): B01J21/04B01J32/00
Inventor 杜艳泽王凤来关明华刘昶
Owner CHINA PETROLEUM & CHEM CORP
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