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Method for removing molecular sieve organic template

An organic template agent and molecular sieve technology, which can be used in simple and rapid removal of organic template agents, can solve the problems of complex device and high operating temperature, and achieve the effects of easy operation, high processing efficiency and simple process.

Active Publication Date: 2019-04-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention relates to a method for removing molecular sieve organic templates. The method mainly uses dielectric barrier discharge technology to generate low-temperature plasma, which solves the problems of removing molecular sieve templates or high operating temperature or complex devices in the past.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Get 20 grams of ammonium type beta molecular sieve (S1) and place it in the discharge area of ​​the dielectric barrier discharge device, and place it evenly, and feed air into the device, the air flow rate is 1000ml / min, and the pulse width is 250ns under the voltage of 20KV. The pulse rise time is 50 ns, the frequency is 50 Hz, and the treatment is 60 minutes to obtain the treated molecular sieve A.

[0022] What used in the embodiment is the beta molecular sieve that contains organic template agent, and template agent is tetraethylammonium hydroxide, and skeleton silicon-aluminum ratio is 11.26, and wherein sodium content (Na 2 O) < 0.04% wt. See Table 1 for the treatment conditions of the S1 molecular sieve release agent under air conditions.

Embodiment 2

[0024] Get 20 grams of ammonium type beta molecular sieve (S1) and place it in the discharge area of ​​the dielectric barrier discharge device, and place it evenly, and feed air into the device, the air flow rate is 1000ml / min, and the pulse width is 600ns under the voltage of 30KV. The pulse rise time is 50 ns, the frequency is 500 Hz, and the treatment is performed for 40 minutes to obtain the treated molecular sieve B.

[0025] What used in the embodiment is the beta molecular sieve that contains organic template agent, and template agent is tetraethylammonium hydroxide, and skeleton silicon-aluminum ratio is 11.26, and wherein sodium content (Na 2 O) < 0.04% wt. See Table 1 for the treatment conditions of the S1 molecular sieve release agent under air conditions.

Embodiment 3

[0027]Get 20 grams of ammonium type beta molecular sieve (S1) and place it in the discharge area of ​​the dielectric barrier discharge device, and place it evenly, and feed air into the device, the air flow rate is 1000ml / min, and the pulse width is 1000ns under the voltage of 50KV. The pulse rise time is 100 ns, the frequency is 100 Hz, and the treatment is for 50 minutes to obtain the treated molecular sieve C.

[0028] What used in the embodiment is the beta molecular sieve that contains organic template agent, and template agent is tetraethylammonium hydroxide, and skeleton silicon-aluminum ratio is 11.26, and wherein sodium content (Na 2 O) < 0.04% wt. See Table 1 for the treatment conditions of the S1 molecular sieve release agent under air conditions.

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Abstract

The invention relates to a method for removing an organic template of a molecular sieve and mainly solves the problems of overhigh operating temperature, complicated equipment and the like in conventional removal of the template of the molecular sieve. The method is characterized in that the molecular sieve containing the organic template is subjected to template removing treatment with a dielectric barrier discharge technology, O2 is selected as plasma working gas, free radicals with extremely high oxidative activity are produced in a discharge process, and under actions of polymerization, substitution, electron transfer, bond breaking and the like between the free radicals and the organic template, the organic template is decomposed and leaves molecular sieve pore channels in a gaseous state without influencing a crystal structure of the molecular sieve. The method for removing the template has the advantages of being high in efficiency, good in effect, wide in technical application range and low in removing temperature, has no influence on the crystal structure of the molecular sieve and adopts simple equipment which is easy to operate, only electric energy is consumed in a removing process, the energy consumption is low, and accordingly, the method can be used for removing the organic template of the molecular sieve.

Description

technical field [0001] The invention relates to a method for removing an organic template of a molecular sieve, in particular to a new method for obtaining a high-quality molecular sieve by removing the organic template at low temperature, simply and quickly. Background technique [0002] Zeolite molecular sieve materials have attracted much attention because of their large specific surface area and controllable pore size, and their broad application prospects in catalysis, adsorption, separation, special material preparation, feed, soil improvement, biomedicine and other fields. Zeolite molecular sieve materials are generally prepared by hydrothermal, sol-gel and other methods under the guidance of organic templates. Separating the template from the inorganic framework is an essential step to obtain an ordered pore structure and a large specific surface area. The template agent in the zeolite molecular sieve material is usually removed by roasting at high temperature. Alt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04
Inventor 郭宏利李晓韬左煜赵申朱志焱
Owner CHINA PETROLEUM & CHEM CORP
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