A kind of method for synthesizing flat ssz-13 molecular sieve with mixed template agent

A technology of mixing template agents and molecular sieves, applied in the field of molecular sieves, can solve the problems of short lifespan, many by-products, and rapid deactivation of molecular sieves, and achieve the effects of high solid-phase yield, good crystallinity, and reduced usage

Active Publication Date: 2020-04-14
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong acidity of SSZ-13 molecular sieve, there are many by-products in the MTO process, and it is easy to cause rapid deactivation due to carbon deposition, which makes the life of the molecular sieve shorter

Method used

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  • A kind of method for synthesizing flat ssz-13 molecular sieve with mixed template agent
  • A kind of method for synthesizing flat ssz-13 molecular sieve with mixed template agent
  • A kind of method for synthesizing flat ssz-13 molecular sieve with mixed template agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method for synthesizing a flat SSZ-13 molecular sieve with a mixed template, the steps are as follows:

[0026] Step 1: Weigh 5.12g of amantadine ammonium hydroxide and 0.20g of tetrahydrofuran and mix evenly; weigh 0.21g of sodium hydroxide and completely dissolve it in 15ml of deionized water. Add the mixed template agent into the sodium hydroxide solution, and stir at room temperature for 1 h to obtain a mixed solution A. The molar ratio of tetrahydrofuran to adamantane ammonium hydroxide is 0.5

[0027] Step 2: Weigh 0.1g aluminum hydroxide (Al 2 o 3 content of 96%) was added to the mixed solution A obtained in step 1, fully stirred until it was completely dissolved; then 1.5g of white carbon black (SiO2 content greater than 99%) was weighed and added to the solution, stirred at room temperature for 1h and fully mixed to obtain a uniform Gel mixture. The ratio of mixed gel is Al 2 o 3 :NaOH:SiO 2 :(THF + adamantane ammonium hydroxide): H 2 O = 1:0.2:50:0...

Embodiment 2

[0030] The method for synthesizing flat SSZ-13 molecular sieves with mixed templates, the basic steps of its preparation are the same as in Example 1, and the difference is: in step 1, the mol ratio of tetrahydrofuran and adamantyl ammonium hydroxide is changed from 0.5 to 0.1, and the result It was found that the crystallinity of the obtained SSZ-13 molecular sieve was good, and the morphology was flat with interlayer. Such as figure 2 SEM characterization picture shown.

Embodiment 3

[0032] The method for synthesizing flat SSZ-13 molecular sieves with mixed templates, the basic steps of its preparation are the same as in Example 1, the difference is: in step 1, the mol ratio of tetrahydrofuran and adamantyl ammonium hydroxide is changed from 0.5 to 1, and the result It was found that the obtained SSZ-13 molecular sieve had poor crystallinity, irregular crystal morphology and rough surface. Such as image 3 SEM characterization picture shown.

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Abstract

The invention discloses a preparation method for synthesizing a flat SSZ-13 molecular sieve with a mixed template agent. The method comprises the following steps: firstly, mixing tetrahydrofuran and adamantane ammonium hydroxide to obtain a mixture to serve as a mixed template agent, dissolving sodium hydroxide in deionized water to form a sodium hydroxide solution, then adding the mixed templateagent into the sodium hydroxide solution and stirring fully to form a mixed solution; secondly, adding an aluminum source and a silicon source into the mixed solution in turn, and stirring for a period of time to form a homogeneous gel mixture; thirdly, transferring the obtained homogeneous gel mixture into a hydrothermal reactor, crystallizing for a period of time at a certain temperature, cooling at room temperature after crystallization, washing and drying a solid phase product with deionized water, and then roasting at 560 DEG C in the air to obtain the flat SSZ-13 molecular sieve. The SSZ-13 molecular sieve synthesized by the method has a flat shape, the shape of formed crystal is regular, and the solid phase yield is high; the method is of great significance to the industrial popularization and application of the SSZ-13 molecular sieve.

Description

technical field [0001] The invention relates to a method for synthesizing a flat SSZ-13 molecular sieve by using a mixed template agent, and belongs to the technical field of molecular sieves. Background technique [0002] Low-carbon olefins are important basic chemical raw materials in the modern chemical industry, and their demand is increasing with the development of modern industry. The traditional production method of ethylene and propylene is petroleum cracking, but considering the limited petroleum resources, a method of producing olefins from methanol was proposed to replace the traditional process. The key to methanol to olefins (MTO) lies in the selection of catalysts. Catalysts that can be used for methanol to olefins include chabazite, erionite, ZK-5 molecular sieve, etc. However, due to the limitation of pore structure, it is easy to form carbon deposits and cause catalyst deactivation. SSZ-13 molecular sieve belongs to CHA type molecular sieve, and belongs to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48
CPCC01B39/48C01P2002/72C01P2004/03
Inventor 王凤刘庆岭刘禹吕双春袁龙
Owner CHIA TAI ENERGY MATERIALS DALIAN
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