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Silicon-modified alumina, as well as preparation method and application thereof

A technology of alumina and silicon modification, applied in chemical instruments and methods, catalyst carriers, chemical/physical processes, etc., to achieve excellent overall performance

Active Publication Date: 2017-04-26
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that although there are many methods for improving the pore volume and surface acidity of alumina in the prior art, there is no modified alumina that can flexibly switch between improving the pore volume and improving the B acid content. craft

Method used

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  • Silicon-modified alumina, as well as preparation method and application thereof
  • Silicon-modified alumina, as well as preparation method and application thereof
  • Silicon-modified alumina, as well as preparation method and application thereof

Examples

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Embodiment 1

[0042] This example provides a method for preparing silicon-modified alumina, and by using this method, silicon-modified alumina whose surface is rich in B acid is prepared. The specific preparation steps include:

[0043] (1) 22g of pseudo-boehmite is added to 50mL of deionized water for beating for 5-10min to obtain pseudo-boehmite slurry; 5mL of 6mol / L hydrochloric acid solution is added dropwise to the pseudo-boehmite slurry to make it Acidification peptization, continuous stirring for 1 hour after the dropwise addition, to obtain pseudo-boehmite sol;

[0044] (2) Add 12 g of silica sol dropwise to the above-mentioned pseudo-boehmite sol to obtain the first mixture;

[0045] (3) Adjust the pH value of the first mixture to 1-2 with 6mol / L hydrochloric acid solution, then add 50mL of deionized water therein, and continue the reaction for 20h in a water bath at 30°C to obtain the second mixture;

[0046] (4) Crystallizing the second mixture at 120° C. for 18 hours to obtain ...

Embodiment 2

[0049] This example provides a method for preparing silicon-modified alumina, and by using this method, silicon-modified alumina with improved pore volume and surface B acid content is obtained. The specific preparation steps include:

[0050] (1) 22g of pseudo-boehmite is added to 50mL of deionized water for beating for 5-10min to obtain pseudo-boehmite slurry; 5mL of 6mol / L hydrochloric acid solution is added dropwise to the pseudo-boehmite slurry to make it Acidification peptization, continuous stirring for 1 hour after the dropwise addition, to obtain pseudo-boehmite sol;

[0051] (2) Add 12 g of silica sol dropwise to the above-mentioned pseudo-boehmite sol to obtain the first mixture;

[0052] (3) Adjust the pH value of the first mixture to 5-6 with ammonia solution, then add 50 mL of deionized water therein, and continue the reaction for 20 h in a water bath at 30° C. to obtain the second mixture;

[0053] (4) Crystallizing the second mixture at 120° C. for 18 hours to...

Embodiment 3

[0056] This example provides a method for preparing silicon-modified alumina, and this method is used to obtain silicon-modified alumina with large pores. The specific preparation steps include:

[0057] (1) 22g of pseudo-boehmite is added to 50mL of deionized water for beating for 5-10min to obtain pseudo-boehmite slurry; 5mL of 6mol / L hydrochloric acid solution is added dropwise to the pseudo-boehmite slurry to make it Acidification peptization, continuous stirring for 1 hour after the dropwise addition, to obtain pseudo-boehmite sol;

[0058] (2) Add 12 g of silica sol dropwise to the above-mentioned pseudo-boehmite sol to obtain the first mixture;

[0059] (3) Adjust the pH value of the first mixture to 10-11 with an ammonia solution, then add 50 mL of deionized water therein, and continue the reaction for 20 h in a water bath at 30° C. to obtain the second mixture;

[0060] (4) Crystallizing the second mixture at 120° C. for 18 hours to obtain a third mixture;

[0061] ...

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Abstract

The invention provides silicon-modified alumina, as well as a preparation method and application thereof. Alumina modified by silicon sol comprises the following steps of (1) acidifying and peptizing pseudo-boehmite slurry with inorganic acid to obtain pseudo-boehmite sol; (2) adding silica sol into the pseudo-boehmite sol to obtain a first mixture; (3) regulating the pH value of the first mixture in a range that the pH is 1 to 11 according to different requirements for the content of surface bronsted acid and pore volume improvement degree of alumina, and conducting a reaction for a period of time under a heating condition to obtain a second mixture; (4) crystallizing the second mixture to obtain a third mixture; and (5) filtering, washing, drying and roasting the third mixture to obtain the silicon-modified alumina. Flexible conversion between emphasizing pore volume improvement and bronsted acid content improvement can be realized by regulating the pH value of the first mixture, so that the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a silicon-modified alumina and its preparation method and application. Background technique [0002] In the field of catalytic cracking, the increasingly inferior quality of raw materials puts forward higher requirements for the catalyst, especially for the alumina used as the matrix and binder, not only requires the surface to have a certain amount of (B) The acid site is used to reduce the coking of the catalyst, and it is also required to have a larger specific surface area and pore volume to improve the mass transfer and heat transfer capabilities of the catalyst. [0003] At present, researchers mainly use the method of adding modifiers to generate B acid sites on the surface of alumina. The most commonly used surface acid modifiers are silicon-containing compounds, including inorganic silicon sources: silica sol, water glass, silicic acid, and organic Silico...

Claims

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Application Information

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IPC IPC(8): B01J21/12B01J32/00B01J35/10
CPCB01J21/12B01J35/60B01J35/638B01J35/635
Inventor 阎子峰白鹏谢梦洁邢伟刘欣梅王有和汪毅张忠东高雄厚
Owner PETROCHINA CO LTD
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