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Middle-pore silicon-aluminium material and its preparing method

A silicon-alumina material and the only technology, applied in the field of mesoporous silicon-alumina materials of catalytic cracking catalysts and their preparation, which can solve the problems of cumbersome preparation process and the like

Active Publication Date: 2005-12-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the pore distribution of the mesoporous silica-alumina material prepared by this method is concentrated at 2-12 nanometers, the maximum pore volume can only reach 0.355ml / g, and the average pore diameter cannot exceed 4 nanometers, and the preparation process is relatively cumbersome.

Method used

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  • Middle-pore silicon-aluminium material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This example illustrates the preparation of the mesoporous silica-alumina material provided by the present invention.

[0020] Water glass (provided by Zhoucun Catalyst Factory, SiO 2 20.7wt%, Na 2 O 6.2wt%) was diluted to 10wt%. Get 160g of 10wt% water glass solution and place it in a beaker, add 20wt% H 2 SO 4 Solution 9.5ml, after adding acid, the acidified water glass solution was left to age for 1 hour, and then added 5wt% Al under stirring 2 (SO 4 ) 3 Solution 49.6g, after stirring for 10 seconds, add 5wt% NaAlO 2 The solution was 3.1 g, and after stirring for 5 minutes, the resulting gel was directly dried in an oven at 120° C. for 18 hours. The resulting silica-alumina xerogel was pulverized to below 40 mesh, and the 4 Cl solution on a gel-dry basis: ammonium salt: H 2 The weight ratio of O=1:1:10 was exchanged at 50°C for 0.5 hours, filtered and then exchanged twice, then filtered and washed, and the filter cake was dried in an oven at 120°C for 12 hou...

Embodiment 2

[0031] This example illustrates the preparation of the mesoporous silica-alumina material provided by the present invention.

[0032] Dilute the water glass (with the same specification) to 8wt%. Get 200g of 8wt% water glass solution and place it in a beaker, add 20wt% H 2 SO 4 Solution 11ml, after adding acid, leave the acidified water glass solution to age for 20 minutes, then add 5wt% Al under stirring 2 (SO 4 ) 3 The solution was 55.0 g, and after stirring for 5 minutes, the resulting gel was aged at 60°C for 4 hours, and then dried in an oven at 120°C for 18 hours. The resulting silica-alumina xerogel was pulverized to below 40 mesh, and the 4 Cl solution on a gel-dry basis: ammonium salt: H 2 The weight ratio of O=1:1:10 was exchanged at 50°C for 0.5 hours, filtered and then exchanged twice, then filtered and washed, and the filter cake was dried in an oven at 120°C for 12 hours. for W-2.

[0033] This sample has the same 27 Al MAS NMR spectrum, its chemical compo...

Embodiment 3

[0043] This example illustrates the preparation of the mesoporous silica-alumina material provided by the present invention.

[0044] Dilute the water glass (with the same specification) to 8wt%. Get 200g of 8wt% water glass solution and place it in a beaker, add 20wt% H 2 SO 4 Solution 10ml, after adding acid, leave the acidified water glass solution to age for 1 hour, then add 5wt% Al under stirring 2 (SO 4 ) 3 Solution 50.4g, after stirring for 10 seconds, add 5wt% NaAlO 2 The solution was 89.0 g. After stirring for 5 minutes, the obtained gel was aged at 60° C. for 4 hours, and then dried in an oven at 120° C. for 18 hours. The resulting silica-alumina xerogel was pulverized to below 40 mesh, and the 4 Cl solution on a gel-dry basis: ammonium salt: H 2 The weight ratio of O=1:1:10 was exchanged at 50°C for 0.5 hours, filtered and then exchanged twice, then filtered and washed, and the filter cake was dried in an oven at 120°C for 12 hours. for W-3.

[0045] This s...

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Abstract

This is a kind of middle porous silicon aluminum material. Its 27Al MAS NMR spectrogram basically has no apex at the chemical displacement 0ppm position, but has the only apex at the 51.7 mm position; the aluminum content in the silicon aluminum material counted with the weight of Al2O3 is 1.0 - 30%; its specific surface area is 100 - 350 m2 / g; its hole content is 0.4 - 0.8 mL / g; its average aperture is 14 - 30 nm; and its most probable aperture is 10 - 30 nm. The material is made as follows: neutralize silicon source and acid solution into colloid when mixed, add aluminum source after laid to aging, after equably mixed, aging, dry, ammonium exchange, again dry. The center holes of the material distributes concentratively and their apertures are rather big; it has bigger specific surface area and hole volume; the Al atoms in the material almost all exist as four coordination style, after ammonium exchange, it can be used as the carrier of cracking catalyst or directly used as catalyst.

Description

technical field [0001] The invention relates to a silicon-aluminum material with concentrated mesopore distribution and a preparation method thereof, and more particularly to a mesoporous silicon-alumina material used for catalytic cracking catalysts and a preparation method thereof. technical background [0002] A heterogeneous catalytic reaction is a process that involves the diffusion of reactant molecules to the catalyst surface and the diffusion of product molecules from the catalyst surface to the reaction system. Therefore, in order to eliminate possible diffusion limitations in the reaction process, different reaction processes should have corresponding catalyst pore structures. Microporous silica-alumina (including zeolite) catalytic materials are widely used in the fields of catalysis, adsorption and separation due to their shape-selective properties, high specific surface area and strong acidity. However, the small pore size (<20 Å) of this type of microporous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/12
Inventor 王维家何鸣元宋家庆宗保宁
Owner CHINA PETROLEUM & CHEM CORP
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