Method for preparing multi-stage pore SAPO-34 molecular sieve by mixing tetrahydrofuran with organic amine as template agent

A technology of tetrahydrofuran and organic amine, which is applied in the field of SAPO-34 molecular sieve synthesis, can solve the problems of difficult diffusion of generated products and deactivation of catalysts, and achieves the effects of good crystal morphology and high solid-phase yield.

Inactive Publication Date: 2018-07-20
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its small pores, the product is not easy to diffuse from the pores, and carbon deposits are easily fo

Method used

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  • Method for preparing multi-stage pore SAPO-34 molecular sieve by mixing tetrahydrofuran with organic amine as template agent
  • Method for preparing multi-stage pore SAPO-34 molecular sieve by mixing tetrahydrofuran with organic amine as template agent
  • Method for preparing multi-stage pore SAPO-34 molecular sieve by mixing tetrahydrofuran with organic amine as template agent

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The preparation method of synthesizing the hierarchical porous SAPO-34 molecular sieve with tetrahydrofuran and organic amine mixed template, the steps are as follows:

[0036] Step 1: Weigh 17g of tetraethylammonium hydroxide (TEAOH, 35%) and mix it with 0.74g of tetrahydrofuran, then add it into 17ml of deionized water, and stir evenly to obtain mixed solution A. The molar ratio of tetrahydrofuran to tetraethylammonium hydroxide was 0.25.

[0037] Step 2: Weighing 0.38g of silica sol and 1.36g of pseudo-boehmite were successively dissolved in the mixed solution A obtained in Step 1, and stirred thoroughly for 1 hour until completely dissolved to obtain mixed solution B.

[0038] Step 3: Weigh 4.65g of phosphoric acid solution (mass fraction is 85%) and add it dropwise to the mixed solution B obtained in step 2, and continue to stir for 30min to obtain a milky white mixed gel. The proportioning of the mixed gel is Al2O3:P2O5:SiO2 :(TEAOH+THF):H2O=1:2:0.15:5:160.

[0...

Embodiment 2

[0041] The preparation method of synthesizing hierarchically porous SAPO-34 molecular sieves with tetrahydrofuran and organic amine mixed templates, the basic steps of its preparation are the same as in Example 1, the difference is: in step one, the mol ratio of tetrahydrofuran and tetraethylammonium hydroxide From 0.25 to 1, such as figure 2 , as shown in 3, the formed SAPO-34 molecular sieve has high crystallinity, no impurity phase exists, and the synthesized sample has a cubic shape. The XRD spectrum is a pure-phase SAPO-34 molecular sieve with a typical CHA skeleton structure.

Embodiment 3

[0043] The preparation method of synthesizing hierarchically porous SAPO-34 molecular sieves with tetrahydrofuran and organic amine mixed templates, the basic steps of its preparation are the same as in Example 1, the difference is: in step one, the mol ratio of tetrahydrofuran and tetraethylammonium hydroxide From 0.25 to 0.1, no SAPO-34 molecular sieves were finally synthesized, and all of them were amorphous gels. Such as Figure 4 shown.

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Abstract

The invention discloses a method for preparing multi-stage pore SAPO-34 molecular sieve by mixing tetrahydrofuran with organic amine as a template agent. Firstly, the tetrahydrofuran and the organic amine are mixed as the mixed template agent, the template agent is added into deionized water and stirred sufficiently to form a mixed solution, then a silicon source and an aluminum source are sequentially added into the mixed solution and stirred for a while to form a homogeneous mixture, phosphoric acid is added dropwisely and stirred continuously until a uniform gel mixture is formed, the gel mixture is transferred to an autoclave, crystallized at a certain temperature for a while and then cooled at room temperature after completion of crystallization, and the solid phase product is washedwith deionized water, dried and then calcined at 580 DEG C in the air to obtain the SAPO-34 molecular sieve. The synthesized SAPO-34 molecular sieve is of a multi-stage pore structure, and has good crystal morphology, high solid phase yield and great significance for industrial application of the SAPO-34 molecular sieve.

Description

technical field [0001] The invention relates to a method for preparing hierarchically porous SAPO-34 molecular sieves by using tetrahydrofuran and organic amine as templates, and belongs to the technical field of SAPO-34 molecular sieve synthesis. 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. SAPO-34 molecular si...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54
CPCC01B37/08C01B39/54C01P2002/72C01P2004/03C01P2004/38C01P2004/61
Inventor 袁龙王闯王凤刘禹周君梦郭俊奇姜叶葳
Owner CHIA TAI ENERGY MATERIALS DALIAN
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