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A kind of compound and preparation method thereof

A composite and alumina technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as specific surface area, loss of intercrystalline pores, and impact on catalytic performance of nanoscale Y molecular sieves. Achieve the effect of increasing specific surface area, increasing pore volume, and facilitating diffusion

Active Publication Date: 2019-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, nanoscale Y molecular sieves have obvious shortcomings in preparation and practical application. Because nanocrystals have a large surface area, they have high surface energy and are prone to agglomeration during use, resulting in specific surface area and intercrystalline pores. etc., which in turn affects the catalytic performance of nanoscale Y molecular sieves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh an appropriate amount of sodium metaaluminate and sodium hydroxide and dissolve them in water, stir and dissolve them, and let them cool down to room temperature. Add water glass (silica mass content 28%, sodium oxide mass content 8.5%) under strong stirring and stir for 20 minutes. Leave standstill 24 hours to make directing agent, the mol ratio of each material of directing agent is 20 (Na 2 O): Al 2 o 3 : 20 (SiO 2 ): 250 (H 2 o). Weigh an appropriate amount of sodium metaaluminate and sodium hydroxide and dissolve them in deionized water. After fully dissolving, add water glass (the mass content of silicon dioxide is 28%, and the mass content of sodium oxide is 8.5%). After mixing, the molar ratio of each substance is 4.5 ( Na2O):Al 2 o 3 : 12 (SiO 2 ): 250H 2 O, then add the directing agent in an amount of 15% of the mass, continue to stir until gelling, put it into a polytetrafluoroethylene-lined reactor, heat to 130 degrees and react for 4 hours to ...

Embodiment 2

[0022]Weigh an appropriate amount of sodium metaaluminate and sodium hydroxide and dissolve them in water, stir and dissolve them, and let them cool down to room temperature. Add water glass (silica mass content 28%, sodium oxide mass content 8.5%) under strong stirring and stir for 20 minutes. Leave standstill 24 hours to make directing agent, the molar ratio of each material of directing agent is 15 (Na 2 O): Al 2 o 3 : 15 (SiO 2 ): 350 (H 2 o). Weigh an appropriate amount of sodium metaaluminate and sodium hydroxide and dissolve them in deionized water. After fully dissolving, add water glass (the mass content of silicon dioxide is 28%, and the mass content of sodium oxide is 8.5%). After mixing, the molar ratio of each substance is 2.5 ( Na 2 O): Al 2 o 3 : 6 (SiO 2 ): 120H 2 O, then add the directing agent, the addition amount is 5% of the mass ratio, continue to stir until the gel is formed, put it into a polytetrafluoroethylene-lined reactor, heat to 100 degree...

Embodiment 3

[0024] Same as Example 1, except that the obtained suspension contains ethylenediaminetetraacetic acid with a mass content of 10%, and is treated at 120°C after evaporation for 6 hours. The obtained product, marked as AlY-3, has the following properties: contains 60% NaY molecular sieve; the grain size of NaY molecular sieve molecular sieve is 100-150nm; the composite has the following pore distribution 1-5nm pore volume 0.32cm 3 / g, 0.15cm in the interval of 30-80nm 3 / g; the specific surface area of ​​the composite is 687m 2 / g, where the outer surface area is 289m 2 The acid content in / gB is 0.35 mmol / g, and the acid content in L is 0.62 mmol / g.

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PUM

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Abstract

The invention discloses a compound and a preparation method thereof. The preparation method includes the following process: first separate the NaY mother liquor containing nanocrystal particles, add water and aluminum salt after washing to prepare a suspension, and the mass content of aluminum in the aluminum salt solution calculated as alumina is 5% to 15%. , the weight ratio of the molecular sieve to the aluminum salt calculated as alumina in the suspension is 0.7:1~1.5:1, and then the Y molecular sieve and alumina composite is obtained after evaporation and roasting. In the NaY molecular sieve and alumina composite prepared by this method, the nano-sized NaY molecular sieve can be uniformly compounded with the alumina.

Description

technical field [0001] The invention relates to a composite and a preparation method thereof, in particular to a nanometer NaY molecular sieve and alumina composite and a preparation method thereof. Background technique [0002] In the process of refining and processing petroleum products, the further cracking of petroleum components and various alkanes, olefins and cyclic hydrocarbons, isomerization and alkylation of petroleum components play an important role. Status, NaY molecular sieves as catalysts for chemical reactions play an important role in such processes. In the middle of the last century, NaY molecular sieves entered industrial application as cracking catalysts. In the following decades, with the advancement of technology and the accumulation of experimental experience, the application range of NaY molecular sieve catalysts has been greatly expanded. The chemical field has been expanded to various directions such as gas separation, water treatment and bioengine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/08B01J35/10
CPCB01J21/04B01J29/084B01J35/19B01J35/617B01J35/633
Inventor 杨洋秦波柳伟杜艳泽方向晨张晓萍董立廷阮彩安
Owner CHINA PETROLEUM & CHEM CORP