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Methods for preparing L-type zeolite guiding agent and zeolite

A zeolite directing agent and the technology of the directing agent, which are applied in the directions of L-type crystalline aluminosilicate zeolite and crystalline aluminosilicate zeolite, etc., can solve the problems of easily associated W heterocrystals or amorphous impurities, difficult crystallization conditions, etc.

Inactive Publication Date: 2016-06-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Synthesizing L-type zeolite under the conditions of lower silicon-aluminum ratio and alkali-silicon ratio, the crystallization conditions are difficult to control, and W heterocrystalline or amorphous impurities are easily associated

Method used

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  • Methods for preparing L-type zeolite guiding agent and zeolite
  • Methods for preparing L-type zeolite guiding agent and zeolite
  • Methods for preparing L-type zeolite guiding agent and zeolite

Examples

Experimental program
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Effect test

example 1

[0080] Example 1. Synthesis of L-type zeolite

[0081] The formula is: 0.35K 2 O:0.003Al 2 o 3 : SiO 2 :0.01M:35(H 2 O+C 2 h 5 Oh)

[0082] Raw materials: (A) silica sol (same as example A)

[0083] (B) Potassium hydroxide (purity 80.00%) was dissolved in distilled water and absolute ethanol.

[0084] (C) Aluminum sulfate.

[0085] Weigh 0.003mol (C) and add it to the corresponding stoichiometric (B), heat to dissolve, then add it to the corresponding (A), stir while adding, and stir for 15 minutes after the addition, to obtain a uniform gel ( D).

[0086] Add the stoichiometric directing agent prepared in Example A and aged for 72 hours to the gel (D), stir evenly, add the corresponding template agent M, namely glycine, stir for 10 minutes, heat to 150°C for crystallization by microwave, and crystallize for 24 Hours later, the colloidal suspension of zeolite L was obtained, and the resulting mixture was centrifuged with a high-speed centrifuge, the supernatant was ...

example 2

[0088] Example 2. Synthesis of L-type zeolite

[0089] The formula is: 0.5K 2 O:0.005Al 2 o 3 : SiO 2 :0.02M:500(H 2 O+C 2 h 5 Oh)

[0090] Raw materials: (A) silica sol (same as example A)

[0091] (B) Potassium hydroxide (purity 80.00%) was dissolved in distilled water and absolute ethanol.

[0092] (C) Aluminum sulfate.

[0093] Weigh 0.003mol (C) and add it to the corresponding stoichiometric (B), heat to dissolve, then add it to the corresponding (A), stir while adding, and stir for 15 minutes after the addition, to obtain a uniform gel ( D).

[0094] Add the stoichiometric directing agent prepared in Example A and aged for 72 hours to the gel (D), stir evenly, add the corresponding template agent M, namely glycine, stir for 10 minutes, heat to 150°C for crystallization by microwave, and crystallize for 24 Hours later, the colloidal suspension of zeolite L was obtained, and the resulting mixture was centrifuged with a high-speed centrifuge, the supernatant was ...

example 3

[0096] Example 3. Synthesis of L-type zeolite

[0097] The formula is: 0.25K 2 O:0.15Na 2 O:0.004Al 2 o 3 : SiO 2 :0.015M:50(H 2 O+C 2 h 5 Oh)

[0098] Raw material: (A) silica sol (same as example 1 (A))

[0099] (B) Potassium hydroxide (purity 80.00%) was dissolved in distilled water and absolute ethanol.

[0100] (C) Sodium aluminate.

[0101] Weigh 0.004mol (C) and add it to the corresponding stoichiometric (B), heat to dissolve, then add it to the corresponding (A), stir while adding, and then stir for 15 minutes after the addition to obtain a uniform gel ( D).

[0102] Add the stoichiometric directing agent prepared in Example A and aged for 72 hours to the gel (D), stir evenly, add the corresponding template agent M, namely glycine, stir for 10 minutes, heat to 150°C for crystallization by microwave, and crystallize for 24 Hours later, the colloidal suspension of zeolite L was obtained, and the resulting mixture was centrifuged with a high-speed centrifuge, ...

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Abstract

The invention relates to methods for preparing an L-type zeolite guiding agent and preparing an L-type zeolite by using the guiding agent. The preparation method of the L-type zeolite comprises the following steps: adding a synthetic mixture with the molar ratio range of K2O / (K2O+Na2O)=(0.6-1):1, (K2O+Na2O) / SiO2=(0.35-0.5):1, SiO2 / Al2O3=1:(0.003-0.0005), solvent / (K2O+Na2O)=(100-1000):1, and template agent R / SiO2=(0.01-0.02):1 into the guiding agent, stirring evenly, then adding a corresponding template agent R, carrying out microwave heating to 150 DEG C, crystallizing, carrying out a reaction for 24 hours to obtain a colloidal suspension of the L-type zeolite, carrying out centrifugal treatment on the colloidal suspension with a high-speed centrifugal machine, removing the supernatant, carrying out water washing treatment on the remaining precipitate repeatedly, then washing with anhydrous ethanol cleanly until a clear liquid is colorless, and then drying to obtain the L-type zeolite, wherein the solid components in the molar ratio formula are calculated according to oxides.

Description

technical field [0001] The invention relates to a method for preparing L-type zeolite directing agent and using the directing agent to prepare the L-type zeolite. Background technique [0002] L-type zeolite is an aluminosilicate containing potassium ions. It is formed by stacking alternating hexagonal column cages and cannonite cages in the direction of the c-axis, and then rotates according to the sixfold axis to produce twelve-ring channels with one-dimensional channels. structure, a large microporous molecular sieve with a pore size of 0.71nm. It not only has cheap raw materials and is easy to prepare, but also has good thermal stability. After being roasted at 800°C, it still maintains the original crystal structure. In addition, L-type zeolite is so far the only aluminosilicate zeolite microporous crystal material whose morphology and particle size can be finely tuned in the laboratory. An example of a zeolite of the LTL structure type is zeolite L, and methods of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/32
CPCC01B39/32C01P2002/72C01P2004/03C01P2004/16C01P2004/50
Inventor 董彬王明文孙长艳李文军常志东刘世香周花蕾
Owner UNIV OF SCI & TECH BEIJING
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