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A kind of all silicon h-beta molecular sieve and its preparation method and application

A molecular sieve, silicon source technology, applied in molecular sieve and alkali exchange compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of increasing production costs, reducing product yield, and high ammonia nitrogen content, and achieving product yield improvement, The effect of high microporous specific surface area and simple synthesis process

Active Publication Date: 2022-05-20
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zeolite synthesized in the alkali system has ion exchange, washing, filtering, drying, roasting and other processes, which will produce a large amount of wastewater with high ammonia nitrogen content and reduce the product yield.
Wastewater must be treated before it can be discharged, which increases the production cost of the enterprise and is not conducive to environmental protection

Method used

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  • A kind of all silicon h-beta molecular sieve and its preparation method and application
  • A kind of all silicon h-beta molecular sieve and its preparation method and application
  • A kind of all silicon h-beta molecular sieve and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the molar ratio template (R): silicon source (SiO 2 ): crystallization aid (M): water (H 2 O): seed crystal (Y)=0.52:1:0.37:12.67:0.2, each raw material is taken by weighing, wherein template R is 30% tetraethylammonium hydroxide (TEAOH) and tetraethylammonium bromide (TEABr ) mixture (the molar ratio of the two is 2:1). The silicon source is silica sol, and the crystallization auxiliary agent M is hydrofluoric acid (HF). The seed crystal is a conventional H-BETA molecular sieve with a silicon-aluminum ratio of 25. Under the condition of stirring at room temperature, mix the silicon source and water, stir for 30 minutes until uniform, then add template agent R to the above solution, continue stirring for 30 minutes, then add crystallization auxiliary agent M to the gel, stir for 2 hours, and add to the gel Add conventional H-BETA molecular sieve seed crystals in small amounts in batches. Put the gel system into a high-pressure reactor with a PTFE liner,...

Embodiment 2

[0037] According to the molar ratio R:SiO 2 :M:H 2 O: Y = 0.56: 1: 0.4: 15: 0.25, each raw material was weighed, wherein the templating agent R was a mixture of 35% tetraethylammonium hydroxide (TEAOH) and tetraethylammonium chloride (TEACl) (two The molar ratio is 4:1). The silicon source is white carbon black. The crystallization auxiliary agent M is hydrofluoric acid (HF). Under the condition of stirring at room temperature, mix the silicon source and water, stir for 60 minutes until uniform, then add template agent R to the above solution, continue stirring for 60 minutes, add crystallization auxiliary agent M to the gel, stir for 1 hour, and add to the gel Add the dealuminated H-Beta molecular sieve seed crystals in small amounts in batches. Put the gel system into a PTFE-lined high-pressure reactor, raise it from room temperature to 165°C, and conduct crystallization treatment for 3 days. After washing and filtering to neutrality. Dry at 140°C for 4 hours, and then...

Embodiment 3

[0039] According to the molar ratio R:SiO 2 :M:H 2 O: Y = 0.6: 1: 0.35: 12.8: 0.15, each raw material was weighed, wherein template agent R was a mixture of 35% tetraethylammonium hydroxide (TEAOH) and tetraethylammonium fluoride (TEAF) (two The molar ratio is 5:1). The silicon source is tetraethyl orthosilicate, and the crystallization auxiliary agent M is hydrofluoric acid (HF). Under the condition of stirring at room temperature, mix the silicon source and water, stir for 12 hours until the tetraethyl orthosilicate is completely hydrolyzed, and release all ethanol and stir evenly, then add the template agent R to the above solution, continue stirring for 20 minutes, and then form a gel Add crystallization auxiliary agent M to the gel, and after stirring for 30 minutes, add dealuminated H-BETA molecular sieve seed crystals to the gel in small amounts. Put the gel system into a high-pressure reactor with a PTFE liner, raise the temperature from room temperature to 140°C, c...

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Abstract

The invention discloses an all-silicon H-Beta molecular sieve and its preparation method and application. In the method, after mixing a silicon source, a template agent, water and a small amount of crystal seeds evenly, an appropriate amount of hydrofluoric acid is added to form a certain proportion of the raw materials glue system. Crystallization synthesis is carried out under high temperature conditions. After the crystallization is completed, the all-silicon H-Beta molecular sieve is obtained through washing, filtering, drying, and roasting. The H-Beta molecular sieve synthesized based on the synthetic method of the present invention has similar specific surface area, smaller aperture and larger particle diameter than conventional Beta molecular sieves. It is characterized by high hydrothermal stability, good hydrophobicity and suitable microporous structure. It shows excellent performance in NOx oxidation-adsorption and gas separation.

Description

technical field [0001] The invention relates to an all-silicon H-Beta molecular sieve and its preparation method and application, belonging to the technical field of Beta molecular sieve synthesis and application. Background technique [0002] Beta molecular sieve is a molecular sieve with a twelve-membered ring intersecting pore system. Because of its unique pore structure, acidity and hydrothermal stability, it exhibits excellent catalytic performance in petrochemical, SCR and other fields. Beta molecular sieve was first successfully synthesized by Mobil Company in 1967. Because of its good thermal stability, moderate acidity and hydrophobicity, it can be used in catalytic cracking of hydrocarbons, hydroisomerization, alkane aromatization, and elimination of volatile organic compounds. , Alkylation and transalkylation reactions have shown excellent catalytic performance. [0003] In 1996, A.Corma et al. (Chem.commun., 1996, 1339) reported that the highly dealuminated Beta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48C01B39/04B01J29/035B01J35/02B01J35/10B82Y30/00B82Y40/00B01J35/00
CPCC01B39/48C01B39/04B01J29/035B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/62C01P2006/12C01P2006/14C01P2006/16C01P2006/17B01J35/40B01J35/61B01J35/617B01J35/633Y02P20/52
Inventor 姜叶葳王闯程鸿魁胡晓倩周彤郝伟李元东袁龙
Owner CHIA TAI ENERGY MATERIALS DALIAN
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