Post-treatment method for molecular sieve modification

A molecular sieve and modification technology, which is applied in the direction of molecular sieve characteristic silicoaluminophosphate, molecular sieve catalyst, molecular sieve and base exchange compound, etc., can solve problems such as acid loss, uneven distribution of mesopores, collapse of molecular sieve crystal structure, etc., and achieve improved selection The modification method is simple and convenient, and the effect of improving the diffusion rate

Active Publication Date: 2021-06-18
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve technical problems such as the collapse of molecular sieve crystal structure, acid loss and uneven distribution of mesopores caused by the

Method used

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  • Post-treatment method for molecular sieve modification
  • Post-treatment method for molecular sieve modification
  • Post-treatment method for molecular sieve modification

Examples

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Example Embodiment

[0022] Example 1

[0023] Preparation of pre-treated beta molecular sieve: Beta primary powder and pyridine are mixed, both of the mass ratio of 1: 20, Beta primary powder pyridine soaking time is 12 h, soaked in molecular sieve filtration or from the end of molecular sieve powder, and wash with distilled water Remove the physical adsorbed pyridine molecule; after washing, further dry, the drying temperature is 150 ° C, the drying time is 2 h; the last tube furnace is high temperature carbonization, the carbonization temperature is 700 ° C, the carbonization time is 2 h.

[0024] The pre-treated BETA molecular sieve with the sodium hydroxide solution (0.4 mol / L) was mixed into the three flask in 1:20, and the mixture solution was added to 70 under the conditions of the microwave power of 600 W, magnetic stirring. The heating base was heated at ° C for 2 h, and the resulting product was washed and filtered by deionized water, and then dried at 100 ° C for 5 hours, and 5 h was car...

Example Embodiment

[0034] Example 2

[0035] Preparation of pre-treated SAPO-11 molecular sieve: Exploring SAPO-11 primary powder first, 100 ° C for 8 h; after mixing with dimethylpyridine, the mass ratio is 1: 5, SAPO-11 original The powder is soaked in dimethylpyridine; the molecular sieve filtration or from the molecular sieve is filtered or removed from the molecular sieve powder, and the physical adsorbed pyridine molecule is removed; after washing, further drying, drying temperature is 100 ° C, drying time 12h; the last tubular furnace is high temperature carbonization, the carbonization temperature is 300 ° C, the carbonization time is 8 h.

[0036] Pre-treatment SAPO-11 molecular sieves and tetrapropyl hydroxide (0.1 mol / L) were added to the three flasks after mixing from 1: 5, and the microwave power was 600W, magnetic stirring conditions Next, the mixture solution was heated at 90 ° C for 1 h, and the resulting product was carried out multiple times and filtered with deionized water, and...

Example Embodiment

[0037] Example 3

[0038] Preparation of the pretreated wire zeolite molecular sieve: first degassing of the silk zeolite powder induced by deprotecting, 400 ° C for 1 h; after mixing with aniline, the mass ratio of 1:30, the moietter zeolite raw phenantine is soaked for 24h The molecular sieve filtration or centrifugation after soaking is filtered or removed by distillation water; after washing, further drying, the drying temperature is 120 ° C, the drying time is 1 h; the last tube furnace is high temperature carbonization, carbonization The temperature was 1000 ° C, the carbonization time was 1 h.

[0039] The pre-treated silk zeolite molecular sieve is mixed with the potassium hydroxide solution (6 mol / L) in mass than 1:20, and the mixture solution is 50 ° C in the case of magnetic stirring is 600 W, magnetic stirring. The lower heating alkali was taken for 12 h, and the obtained product was washed and filtered with deionized water, and then dried at 120 ° C for 4 h at 600 °...

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Abstract

The invention belongs to the technical field of molecular sieve treatment methods, and discloses a post-treatment method for molecular sieve modification. The post-treatment method comprises the following steps: soaking a molecular sieve in an organic weak base, conducting water washing, drying and carbonizing to obtain a pretreated molecular sieve, and mixing the pretreated molecular sieve with an inorganic base to obtain modified molecular sieve. According to the method, a molecular sieve product with high micropore structure retention degree, high acid site retention degree and a micropore-mesopore structure composite can be obtained; and meanwhile, the post-treatment modification method provided by the invention is simple and convenient, and can achieve the purposes of improving the diffusion rate of macromolecules in molecular sieve crystals and improving the selectivity of a target product.

Description

technical field [0001] The invention relates to the technical field of molecular sieve treatment methods, in particular to a post-treatment method for molecular sieve modification. Background technique [0002] Molecular sieves are a class of porous materials with regular pore structures. Due to their high hydrothermal stability, good shape selectivity, and adjustable acidity, they have been widely used as new materials for catalysis, adsorption separation, and ion exchange. , environment and other related fields. For example, Y-type molecular sieve is the main active component of catalytic cracking unit catalyst in petroleum refining process; A-type molecular sieve is used in gas separation unit to produce oxygen. When molecular sieves are used as catalytic materials, the diffusion of molecules with a molecular size larger than the pores of the molecular sieve will generate resistance, especially when using microporous molecular sieves, high diffusion resistance can easily...

Claims

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Application Information

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IPC IPC(8): C01B39/02C01B39/46C01B39/26C01B39/54C01B37/08B01J29/70B01J29/85B01J29/18B01J35/10
CPCC01B39/026C01B39/46C01B39/26C01B39/54C01B37/08B01J29/7007B01J29/85B01J29/18B01J35/1019B01J35/1038C01P2006/12C01P2006/14
Inventor 刘毓翔于海刘新春李露刘仕伟刘悦于海龙于世涛
Owner QINGDAO UNIV OF SCI & TECH
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