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Montmorillonite/ZSM-5 molecular sieve composite material and preparation thereof

A composite material, ZSM-5 technology, applied in the field of new catalytic materials and their preparation, can solve the problems of affecting catalytic performance, prone to sintering, etc., and achieve the effects of good hydrothermal stability, easy separation, and low cost of raw materials

Active Publication Date: 2008-08-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although nanometer-sized molecular sieves can be produced by adopting the above methods, small-grained molecular sieves are prone to sintering during the separation process and the catalytic reaction process, agglomerating into larger particles, and affecting their catalytic performance.

Method used

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  • Montmorillonite/ZSM-5 molecular sieve composite material and preparation thereof
  • Montmorillonite/ZSM-5 molecular sieve composite material and preparation thereof
  • Montmorillonite/ZSM-5 molecular sieve composite material and preparation thereof

Examples

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preparation example Construction

[0023] (1) Preparation of directing agent: Silicon source, templating agent, sodium hydroxide and water according to (8-20) SiO 2 :(TPA) 2 O:(1~4)Na 2 O:(350~600)H 2 The molar ratio of O is mixed at room temperature and under mechanical stirring conditions, and the stirring is continued until the raw materials are evenly mixed, then transferred to the synthetic bomb, and heated at 90-110°C under airtight conditions for 10-20 hours, preferably 16-20 Hours, make the guide agent. Wherein said silicon source is white carbon black, silica sol or silicic acid; said template is tetrapropyl ammonium hydroxide.

[0024] (2) Preparation of ZSM-5 molecular sieve gel: silicon source, aluminum source, sodium hydroxide and water according to (20 ~ 50) SiO 2 :Al 2 o 3 : (2~5)Na 2 O:(800~1200)H 2 The molar ratio of O is mixed at room temperature and under mechanical stirring conditions, and the stirring is continued until the raw materials are evenly mixed to obtain silica-alumina gel...

Embodiment 1

[0038] (1) Preparation of directing agent:

[0039] ①Weigh 13.8g of sodium hydroxide, dissolve it in 710.3g of distilled water, then add 117.0g of tetrapropylammonium hydroxide aqueous solution, and mix well with electromagnetic stirring. ② Take 158.9g of silicic acid and add it into the solution, stir evenly with electromagnetic. ③After magnetically stirring the above solution for 0.5 hours, put it into a synthetic bomb and age it at 100°C for 16 hours to make a directing agent.

[0040] (2) Synthesis of ZSM-5 molecular sieve and its growth on montmorillonite microspheres.

[0041] ① Weigh 867.8g of distilled water, dissolve 10.2g of sodium hydroxide and 10.3g of sodium aluminate, and stir well. ②124g of silicic acid was gradually added into the solution under full stirring, and vigorously stirred at room temperature. ③Add 30ml of directing agent to the above solution, then add 60g of montmorillonite microspheres, and stir at room temperature for 0.5 hours. Hydrothermal c...

Embodiment 2

[0045] (1) Preparation of directing agent:

[0046] ①Weigh 13.8g of sodium hydroxide, dissolve it in 710.3g of distilled water, then add 117.0g of 25% tetrapropylammonium hydroxide aqueous solution, and mix evenly with electromagnetic stirring. ②Weigh 158.9g of silicic acid and add it into the solution, stir evenly with electromagnetic. ③After magnetically stirring the above solution for 0.5 hours, put it into a synthetic bomb and age it at 100°C for 16 hours to make a directing agent.

[0047] (2) Synthesis of ZSM-5 molecular sieve and its growth on montmorillonite microspheres.

[0048] ① Weigh 867.8g of distilled water, dissolve 8.8g of sodium hydroxide and 10.3g of sodium aluminate, and stir well. ② Gradually add 113.1g of silicic acid into the solution under full stirring, and vigorously stir at room temperature. ③ Add 30ml of directing agent to the above solution, then add 40g of montmorillonite microspheres, and stir at room temperature for 0.5 hours. Hydrothermal c...

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Abstract

The present invention provides a montmorillonite / ZSM-5 molecular sieve composite material and its preparing method. The montmorillonite / beta molecular sieve composite material is prepared by evenly mixing montmorillonite with ZSM-5 molecular sieve gelatin, then processing home position crystallization, and via filtering, washing and drying. The composite material have structure characteristics of the montmorillonite and the molecular sieve at the same time, the montmorillonite and the molecular sieve are alternative. The synthetic montmorillonite / ZSM-5 molecular sieve have characteristics of small crystal grain molecular sieve by controlling the synthetic course and the conditions. The preparing method is simple, the easily separating, the molecular sieve composite material has better water-heat stability. The composite material are mainly used for all kinds of catalysts and absorption agents, especially the preparing of hydrogenation catalyst.

Description

technical field [0001] The invention relates to a novel catalytic material and a preparation method thereof, in particular to a montmorillonite / ZSM-5 molecular sieve composite material and a preparation method thereof. Background technique [0002] Small-grain ZSM-5 molecular sieve has a unique topological structure, better thermal stability and more acidity, good catalytic reaction stability, and good coking resistance, and is widely used in catalytic fields such as petroleum processing and fine chemicals , has rapidly developed into a new type of catalytic material in recent years. [0003] CN1303816A discloses a method for preparing small-grain ZSM-5 zeolite by directing method, which is characterized in that a highly active directing agent is prepared to replace the organic template agent, and the crystallization process adopts two-stage temperature programming. CN1608990A has introduced a kind of method that nanometer size contains heteroatom ZSM-5 zeolite, it is chara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J21/16
Inventor 张志智凌凤香张喜文范峰孙万付兰权方向晨
Owner CHINA PETROLEUM & CHEM CORP
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