Preparation method and application of molecular sieve catalyst

A molecular sieve and catalyst technology, applied in the field of molecular sieve catalyst preparation, can solve problems such as no public report of nano ZSM-5, achieve the effects of good industrial application prospect, low xylene impurity content, and easy to scale up production

Active Publication Date: 2020-03-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these patents discloses the preparation of nano ZSM-5

Method used

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  • Preparation method and application of molecular sieve catalyst
  • Preparation method and application of molecular sieve catalyst
  • Preparation method and application of molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] 1) Dissolve 25.0g of ethyl tetrasilicate in 12.0g of deionized water, add 10ml of tetrapropylammonium hydroxide solution with a concentration of 3mol / L, stir at room temperature for 1h, and put it in an oil bath at 110°C for crystallization Reflux for 80 hours to obtain a ZSM-5 seed crystal gel solution.

[0129] 2) Mix 20.0g tetraethyl silicate, 0.7g sodium metaaluminate, 0.3g sodium hydroxide, and 7g water to obtain a mixed solution; add the above mixed solution to 8.0g ZSM-5 seed crystal solution, and Aging was carried out under stirring for 6 hours, and the water in the solution was evaporated to dryness by placing in a water bath at 50° C. to obtain a solid gel.

[0130] 3) Grind the solid gel into powder and transfer it to a polytetrafluoroethylene support; then add 5ml of deionized water to the hydrothermal kettle, transfer the support to the hydrothermal kettle, seal it, and place it in an oven at 130°C for crystallization. for 48 hours; after the crystallized ...

Embodiment 2

[0134] The tetraethyl orthosilicate in step 1) of Example 1 was replaced with 24.0 g of silica sol (30 wt%) with equimolar silicon content, and the rest of the synthesis conditions remained unchanged to obtain a molecular sieve catalyst, marked as 2#.

Embodiment 3

[0136] The tetrapropylammonium hydroxide solution in step 1) of Example 1 was replaced with 6.3 g of tetraethylammonium bromide in an equimolar amount, and the rest of the synthesis conditions remained unchanged to obtain a molecular sieve catalyst, marked as 3#.

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Abstract

The invention discloses a preparation method of a molecular sieve catalyst. The preparation method comprises the following steps: obtaining a ZSM-5 seed crystal gel solution; adding a mixture I containing a silicon source, an aluminum source, an alkali and water into the ZSM-5 seed crystal gel solution to obtain a mixture, and aging the mixture to obtain a solid gel; carrying out water steam-assisted crystallization, calcination, ammonium ion exchange and calcination on the solid gel under a sealed condition to obtain a nano-ZSM-5 molecular sieve; and carrying out water steam treatment and phosphorus modification on the obtained nano-ZSM-5 molecular sieve, and performing calcination to obtain the molecular sieve catalyst. The catalyst has the characteristics of uniform distribution of acid sites, and high crystallinity, and the preparation method has the advantages of less generated wastewater, and convenience in large-scale production; and the catalyst has the advantages of good hydrothermal stability in an alkylation reaction of ethanol and benzene, keeping high ethyl selectivity under a low benzene-alcohol ratio feeding condition, low content of xylene impurities in the product, and good industrial application prospect.

Description

technical field [0001] The application relates to a preparation method and application of a molecular sieve catalyst, belonging to the field of materials. Background technique [0002] Ethylbenzene is an important commercial derivative of benzene in the current chemical industry. It is mainly used for the dehydrogenation of styrene, and it is also an important raw material for the production of polystyrene and ABS resin. In recent years, the market demand for ethylbenzene has shown an obvious upward trend, but the depletion of petroleum resources and the soaring price of petroleum have greatly increased the cost of ethylene alkylation, and it has become a trend to seek new raw materials to replace ethylene to prepare ethylbenzene. As a renewable clean energy, ethanol can not only be produced via petroleum route, but also can be obtained from large-scale production of agricultural by-products and coal, which saves the cost from the source of ethanol production and provides mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J37/28B01J37/10C07C2/86C07C15/073
CPCB01J29/40B01J37/0018B01J37/10B01J37/28C07C2/864C07C15/073C01B39/40C07C2/86
Inventor 苏雄杨晓丽黄延强张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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