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Method for preparing molecular sieve

A technology of molecular sieve and gel, which is applied in the direction of molecular sieve and alkali-exchange phosphate, molecular sieve and alkali-exchange compound, molecular sieve characteristic silicoaluminophosphate, etc., to achieve the effect of shortening the crystallization time and improving the relative crystallinity

Active Publication Date: 2018-07-20
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no invention about the method of preparing molecular sieves by gamma rays in the prior art

Method used

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  • Method for preparing molecular sieve
  • Method for preparing molecular sieve
  • Method for preparing molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0027] 221.01 g of Na 2 SiO 3 9H 2 O is dissolved in 361.8 grams of water to prepare a clear sodium silicate aqueous solution (material A), and 90.45 grams of NaAlO 2 and 170.05 grams of NaOH were dissolved in 361.8 grams of water to obtain material B. Add material B to material A under stirring, and after stirring evenly, put the obtained A molecular sieve gel into a plugged quartz tube, crystallize at 20°C for 30, 54, 78, 102 hours, and the obtained product is pumped Obtain A molecular sieve after filtering, washing, drying and roasting, and its XRD pattern is shown in figure 1 .

Embodiment 5-11

[0029] In Example 1, the obtained A molecular sieve gel was packed into a plugged quartz tube to 60 Co is the ray source, and at a radiation dose rate of 9 kGy (kilogray) / day and 20 ° C, the crystallization is 18, 23, 41, 45, 63, 68 and 85 hours, and the rest of the conditions are unchanged. XRD spectrum see figure 2 ;

Embodiment 12-17

[0031] In Example 1, the obtained A molecular sieve gel was packed into a plugged quartz tube to 60 Co is the ray source, crystallized at 39kGy (kilogray) / day and 20°C for 18, 41, 45, 63, 68 and 85 hours, and the rest of the conditions remained unchanged. The XRD spectrum pattern of the obtained sample is shown in image 3 , the SEM image of the sample obtained after irradiation for 63 hours is shown in Figure 4 ;

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Abstract

The invention discloses a method for preparing a molecular sieve. The method comprises the following steps: preparing a molecular sieve gel, and crystallizing the molecular sieve gel under a gamma rayradiation condition to obtain the molecular sieve. The method greatly shortens the crystallization time of the synthesized molecular sieve and greatly improves the relative crystallinity of the molecular sieve.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a method for preparing molecular sieves by gamma ray irradiation. Background technique [0002] Molecular sieves are widely used in separation, adsorption, and material additives. Molecular sieves can also be used as metal ion carriers for the preparation of host-guest functional materials and molecular sieve membranes for alcohol / water separation [FuelProcess Technol, 2007 , 88(2):129-135]. The synthesis process of molecular sieves includes the process of depolymerization and recondensation of gel molecules. This process is affected by many conditions, such as the silicon source, aluminum source, alkalinity, aging conditions and crystallization process in the gel will affect the molecular sieve. structure and performance. [0003] The crystallization process is the process of heating the gel in a quartz tube or a reactor, and controlling the heating rate, crystalliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/16C01B37/08C01B39/54C01B39/40C01B39/02
CPCC01B37/08C01B39/023C01B39/16C01B39/40C01B39/54C01P2002/72C01P2004/03
Inventor 丘明煌吴晛刘子玉陈新庆杨承广任淑吴丹曾高峰
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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