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Method for preparing mesoporous catalytic composite material

A composite material and mesoporous technology, which is applied in the field of preparing mesoporous catalytic composite materials to achieve the effects of reducing production cost, enriching mesoporous structure, and large specific surface and pore volume.

Active Publication Date: 2012-12-19
HUNAN JULI CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using diatomite and kaolin as the main raw materials, the synthesis of mesoporous catalytic composites containing NaY zeolite molecular sieves by hydrothermal in situ crystallization has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) 198g kaolin and 1792g diatomaceous earth are added with water and stirred evenly to make a slurry with a solid content of 47%, add 120ml of sodium silicate as a dispersant, adjust the final pH value of the slurry to 4.0 with 8% hydrochloric acid, slurry for 1 hour, and spray Drying and molding into microspheres with a median diameter of 71.37 μm, putting the microspheres into a muffle furnace, and roasting at 700°C for 10 hours to obtain mixed clay roasted microspheres;

[0025] (2) Add water to 490g ZSM-5 zeolite molecular sieve to make a slurry with a solid content of 45%, add 210g of aluminum sol as a binder, spray dry and form microspheres with a median diameter of 69.26 μm, and put the microspheres into a muffle furnace in 820°C for 3.5 hours to obtain calcined microspheres;

[0026] (3) 870ml of sodium silicate, 360ml of lye (sodium hydroxide), 130ml of zeolite directing agent, 500g of mixed clay roasted microspheres, and 300g of roasted microspheres are dropp...

Embodiment 2

[0029] (1) Kaolin 4104g, diatomaceous earth 456g add water to make slurry, solid content 35%, add dispersant 130g field green powder, 15% sodium hydroxide adjusts pH value 12.0, slurry for 4 hours, spray dry, microsphere median diameter 73.51m, calcined at 1000°C for 0.5 hours to obtain mixed clay calcined microspheres;

[0030] (2) 600g of kaolin, 60g of ZSM-5 zeolite molecular sieve are added with water to make slurry, the solid content is 37%, and 53g of aluminum sol is added as a binder, spray-dried, the median diameter of microspheres is 75.14 μm, and roasted at 600°C for 10 hours to obtain roasted microspheres. ball;

[0031] (3) Put 2920ml of sodium silicate, 350ml of lye, 130ml of zeolite directing agent, 200g of mixed clay roasted microspheres, and 120g of roasted microspheres into a stainless steel crystallization reactor, heat up to 120°C, and crystallize at a constant temperature for 8 hours. The composite material contains 43.8% NaY zeolite molecular sieve, its s...

Embodiment 3

[0033] (1) Kaolin 713g, diatomaceous earth 100g add water to make slurry, solid content is 35%, add dispersant 25g sodium polyacrylate, 10% sodium hydroxide adjust pH value 9.5, slurry for 3 hours, spray dry, microsphere 73.39 μm in diameter, roasted at 930°C for 2.5 hours to obtain mixed clay roasted microspheres;

[0034] (2) 137g of kaolin, 320g of NaX zeolite molecular sieve, add water to make slurry, solid content is 40%, add binder 70g silica sol, spray dry, the median diameter of microspheres is 68.63 μm, roasting at 900°C for 0.5 hours, to obtain roasted microspheres ;

[0035](3) Put 287ml of sodium silicate, 240ml of lye, 80ml of zeolite directing agent, 200g of mixed clay roasted microspheres, and 30g of roasted microspheres into a stainless steel crystallization reactor, raise the temperature to 90°C, and crystallize at a constant temperature for 32 hours. The composite material contains 55.1% NaY zeolite molecular sieve, its silicon-aluminum ratio is 5.2, wear in...

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Abstract

The invention discloses a method for preparing a mesoporous catalytic composite material. The method is characterized by taking diatomaceous earth and kaolin as raw materials and comprising the following steps of: A, adding water and a dispersing agent into the diatomaceous earth and kaolin, uniformly stirring to obtain a slurry, adjusting a slurry destination pH value to 4.0-12.0 by using acid or alkali, spraying and drying to form a microsphere, and calcining the microsphere to obtain a mixed clay calcined microsphere; B, adding water and an adhesive into the kaolin and a zeolite molecular sieve, uniformly stirring to form a slurry, spraying and drying to form a microsphere, and calcining the microsphere to obtain a calcined microsphere; and C, adding sodium silicate, alkali liquor and a zeolite guide agent into the mixed clay calcined microsphere obtained in the step A and / or the calcined microsphere obtained in the step B, then putting into a crystallized reaction kettle for hydrothermal crystallization, filtering to remove mother liquor, washing the filter material by using deionized water, filtering again to obtain the washed filter material, and drying the filter material to obtain the mesoporous catalytic composite material containing a NaY zeolite molecular sieve. The method disclosed by the invention is mainly used for preparing the mesoporous catalytic composite material containing the NaY zeolite molecular sieve.

Description

technical field [0001] The invention relates to a method for preparing a mesoporous catalytic composite material, specifically, a method for preparing a mesoporous catalytic composite material containing NaY zeolite molecular sieve by using diatomite and kaolin as raw materials through a hydrothermal in-situ crystallization method method. Background technique [0002] Since the U.S. Patent US 3119659 announced the synthesis of NaY zeolite molecular sieve with kaolin as raw material in 1964, the synthesis of zeolite molecular sieve from natural minerals has become a research hotspot due to its high utilization rate, low cost, simple and practical process, and more and more reports on it. . [0003] Using diatomite and kaolin as the main raw materials, the synthesis of mesoporous catalytic composites containing NaY zeolite molecular sieves by hydrothermal in situ crystallization technology has not been reported yet. Diatomaceous earth is mainly used in industry as filter aid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/08B01J35/10
Inventor 姚华郑淑琴谈立成阳光军
Owner HUNAN JULI CATALYST
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