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A method for in-situ synthesis of fe/al-beta zeolite molecular sieves

A zeolite molecular sieve, in-situ synthesis technology, applied in molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of high acid strength, structural defects, reduced framework stability, etc., and achieve wide application prospects Effect

Active Publication Date: 2019-02-05
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low crystallinity of existing Beta molecular sieves, high acid strength, side reactions and easy occurrence of carbon deposition and deactivation when used as acidic catalysts, and the use of post-treatment modification will produce structural defects , reduce the technical problems of its skeleton stability, and provide a method for in-situ synthesis of Fe / Al-Beta zeolite molecular sieves

Method used

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  • A method for in-situ synthesis of fe/al-beta zeolite molecular sieves
  • A method for in-situ synthesis of fe/al-beta zeolite molecular sieves
  • A method for in-situ synthesis of fe/al-beta zeolite molecular sieves

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specific Embodiment approach 1

[0018] Specific embodiment one: this embodiment is a kind of method for synthesizing Fe / Al-Beta zeolite molecular sieve in situ, specifically is finished according to the following steps:

[0019] 1. Preparation of initial gel: Ethyl orthosilicate, ferric nitrate, aluminum nitrate, tetraethylammonium hydroxide aqueous solution and sodium hydroxide with a mass fraction of 35% were sequentially added to secondary deionized water, at room temperature and 400r Stir for 0.5h~1.5h under the rotating speed of / min~1000r / min, obtain initial gel; The mass ratio of described ethyl orthosilicate and ferric nitrate is 1:(0.01~0.08); Said ethyl orthosilicate The mass ratio with aluminum nitrate is 1:(0.01~0.08); the mass ratio of described ethyl orthosilicate and the tetraethylammonium hydroxide aqueous solution that mass fraction is 35% is 1:(0.8~1.0); The mass ratio of ethyl orthosilicate to sodium hydroxide is 1:(0.01~0.03); the mass ratio of described ethyl orthosilicate to secondary d...

specific Embodiment approach 2

[0023] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: in step 1, stir at room temperature and at a speed of 500r / min-800r / min for 0.8h-1.2h. Others are the same as the first embodiment.

specific Embodiment approach 3

[0024] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the crystallization temperature in step 2 is 105-125°C. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for in-situ synthesizing Fe / Al-Beta zeolite molecular sieve, and relates to a method for synthesizing molecular sieves, and the method is used for solving the technical problems that an existing Beta molecular sieve has low crystalline degree and over high acid strength, causes side reaction when applied as an acid catalyst, and easily causes carbon deposition inactivation and the like, but post-treatment modified Beta molecular sieve has structure defects, causes reduction of frame stability and the like. The method comprises the following steps: 1, preparing initial gel from the following raw materials: tetraethoxysilane, ferric nitrate, aluminum nitrate, a tetraethylammonium hydroxide aqueous solution having a mass percentage of 35 percent, sodium hydroxide and secondary deionized water; and 2, crystallizing the initial gel, cooling, and sequentially centrifugally separating, washing and drying, and roasting to obtain the Fe / Al-Beta zeolite molecular sieve. The method is mainly used for preparing a pure-phase Fe / Al-Beta molecular sieve.

Description

technical field [0001] The invention relates to a method for synthesizing molecular sieves. Background technique [0002] Beta molecular sieve is a kind of aluminosilicate zeolite molecular sieve with BEA topology structure, which has three-dimensional twelve-membered ring intersecting channels, and the channel size is 0.64×0.76nm. Because Beta molecular sieve has unique pore structure and size, it has broad application prospects in petroleum processing, petrochemical, fine chemical and other fields. [0003] Due to the strong acidity of the traditional Beta aluminosilicate molecular sieve itself, it is prone to carbon deposition and deactivation as an acidic catalyst, and the application of an acidic carrier as a dual-functional catalyst in the hydroisomerization reaction of long carbon chain n-paraffins will also intensify The occurrence of cracking side reactions reduces the selectivity of isomerization products. Using water vapor or acid dealumination and other post-tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04C01B39/06B01J29/76
CPCB01J29/7615C01B39/04C01B39/06C01P2002/72C01P2004/03C01P2004/30C01P2006/12C01P2006/14
Inventor 吴伟魏小盟
Owner HEILONGJIANG UNIV