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Silicon-aluminum composite material and preparation method thereof

A silicon-aluminum composite material, alumina technology, applied in chemical instruments and methods, catalytic cracking, molecular sieve catalysts, etc., can solve the problems of easy structure collapse, poor cracking activity, high price, etc., and achieve improved accessibility and pore structure. The effect of smooth and promoting catalytic activity

Active Publication Date: 2019-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this molecular sieve is that it needs to use an expensive template agent, and the pore size is only about 2.7nm. It still has a large steric hindrance effect on the cracking reaction of macromolecules. The structure is easy to collapse under high temperature hydrothermal conditions, and the cracking activity is low Difference

Method used

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  • Silicon-aluminum composite material and preparation method thereof
  • Silicon-aluminum composite material and preparation method thereof
  • Silicon-aluminum composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example illustrates the silicon-aluminum composite material of the present invention and its preparation process.

[0032] With 7.5SiO 2 :Al 2 o 3 : 2.15Na 2 O: 190H 2 O gel feeding molar ratio to synthesize NaY molecular sieve. Water glass, aluminum sulfate, sodium metaaluminate, directing agent and deionized water were mixed according to the above ratio and vigorously stirred for 1 hour, wherein the addition ratio of directing agent was 5% by weight, and the mixed gel was Crystallized at 100°C for 34 hours, filtered, washed and dried to obtain NaY molecular sieve dry powder.

[0033] The NaY molecular sieve dry powder obtained above was mixed with an appropriate amount of deionized water for beating, the temperature was raised to 45°C and Al(NO 3 ) 3 Solution (concentration 60gAl 2 o 3 / L) and NaAlO 2 Solution (concentration 102gAl 2 o 3 / L) was added to it for neutralization reaction, the pH value of the slurry system was maintained at 10.0 by adjust...

Embodiment 2

[0038] This example illustrates the silicon-aluminum composite material of the present invention and its preparation process.

[0039] Prepare NaY molecular sieve gel according to the molar ratio of gel feeding in Example 1 and the same feeding sequence. After stirring vigorously for 1 hour, crystallize the gel at 100°C for 25 hours, and obtain NaY molecular sieve after filtering, washing and drying. dry powder.

[0040] The NaY molecular sieve dry powder obtained above was mixed with an appropriate amount of deionized water for beating, and the AlCl 3 Solution (concentration 60gAl 2 o 3 / L) and NaOH solution (concentration 1M) were added to carry out neutralization reaction, the pH value of the slurry system was maintained at 9.4 by adjusting the flow rate of the two materials, and after the neutralization reaction, the aging treatment was continued at 60°C for 2 hours. After filtering, washing and drying, the silicon-aluminum composite material of the present invention is...

Embodiment 3

[0045] This example illustrates the silicon-aluminum composite material of the present invention and its preparation process.

[0046] With 8.5SiO 2 :Al 2 o 3 : 2.65Na 2 O: 210H 2 O gel feeding molar ratio to synthesize NaY molecular sieve. Water glass, aluminum sulfate, sodium metaaluminate, directing agent and deionized water were mixed according to the above ratio and vigorously stirred for 1 hour, wherein the addition ratio of directing agent was 5% by weight, and the mixed gel was Crystallized at 100°C for 42 hours, filtered, washed and dried to obtain NaY molecular sieve dry powder.

[0047]The NaY molecular sieve dry powder obtained above was mixed with an appropriate amount of deionized water for beating, the temperature was raised to 40°C, and at this temperature, the Al 2 (SO 4 ) 3 Solution (concentration 90gAl 2 o 3 / L) and ammonia (mass fraction 8%) were added therein to carry out neutralization reaction, the pH value of this slurry system was kept on 8.7...

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Abstract

The invention relates to a silicon-aluminum composite material. The material is characterized in that: characteristic diffraction peaks appear at positions 6.2 degrees, 10.1 degrees, 11.9 degrees, 14degrees, 15.7 degrees, 18.7 degrees, 20.4 degrees, 23.7 degrees, 27.1 degrees, 28 degrees, 31.4 degrees, 38.5 degrees, 49 degrees and 65 degrees in the XRD spectra of the material, thus representing that the material has an FAU crystal structure and a pseudo-boehmite structure at the same time, a fold-like pseudo-boehmite structure alumina mesoporous layer is coated on the surface of the FAU crystal structure, and the two structures are intercommunicated and grow together. In terms of the oxide weight, the composite material comprises: 4-12% of sodium oxide, 20-60% of silicon oxide, and 30-75%of alumina. The composite material has gradient pore distribution, and the mesoporous alumina layer is conducive to improving the pore patency, and promotes macromolecular mass transfer.

Description

technical field [0001] The present invention relates to a composite material and a preparation method thereof. Further, the present invention relates to a silicon-aluminum composite material with a Y-type molecular sieve crystal structure inside and an alumina mesoporous structure on the surface and a preparation method thereof. Background technique [0002] Catalytic cracking is a very important process in the petroleum refining process. It is widely used in the petroleum processing industry and occupies a pivotal position in the refinery. In the catalytic cracking process, heavy fractions such as vacuum distillates or residues of heavier components are reacted in the presence of a catalyst to convert gasoline, distillate and other liquid cracking products and lighter gaseous cracking of up to four carbons product. The catalytic cracking reaction process follows the carbon ion reaction mechanism, so it is necessary to use acidic catalytic materials, especially catalytic ma...

Claims

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Application Information

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IPC IPC(8): B01J29/08B01J35/10C10G11/05
Inventor 郑金玉王成强罗一斌
Owner CHINA PETROLEUM & CHEM CORP