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A kind of preparation method of nano sapo-34 molecular sieve

A technology of SAPO-34 and molecular sieves, which is applied in the field of preparation of nano-SAPO-34 molecular sieves by mixing and synthesizing nanometer SAPO-34 molecular sieves at low temperature in an ultra-concentrated system. Effects of Environmental Pollution

Active Publication Date: 2021-07-30
深圳科冠华太新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the presence of a large amount of water, and it is easy to produce more waste liquid, causing certain pollution to the environment.

Method used

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  • A kind of preparation method of nano sapo-34 molecular sieve
  • A kind of preparation method of nano sapo-34 molecular sieve
  • A kind of preparation method of nano sapo-34 molecular sieve

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preparation example Construction

[0025] A kind of nanometer SAPO-34 molecular sieve is mixed and synthesized at low temperature with ultra-concentrated system, and the concrete steps of its preparation method are as follows:

[0026] Step 1, adding the aluminum source into phosphoric acid and stirring thoroughly to obtain a mixed solution A, and standing in the ice-water mixture for 5-30 minutes. Aluminum source contains Al 2 o 3 , the aluminum source is sodium metaaluminate (Al 2 o 3 Content 50%), pseudoboehmite (Al 2 o 3 content 75%) and alumina (Al 2 o 3 Content 99%) in one or more; phosphoric acid contains P 2 o 5 (P 2 o 5 content 85%); among them, Al 2 o 3 with P 2 o 5 The molar ratio is 0.1-2.

[0027] In step 2, the silicon source and the template are mixed successively to obtain a mixed solution B, and the mixed solution B is stirred in an ice bath for 5-20 min. Silicon source contains SiO 2 , the silicon source is white carbon black (SiO 2 content greater than 99%) and silica sol (S...

Embodiment 1

[0031] In the present embodiment, the steps of the preparation method of nanometer SAPO-34 molecular sieve are as follows:

[0032] Step 1: Weigh 3.7g of pseudo-boehmite and add it to 5.76g of phosphoric acid, stir well to obtain mixed solution A, and let it stand in the ice-water mixture for 5-30min.

[0033] Step 2: Weigh 1.3 g of silica sol and 21 g of tetraethylammonium hydroxide (TEAOH content 35%), mix them, and stir in an ice bath for 20 minutes to obtain a mixed solution B.

[0034]Step 3: Slowly add the mixed solution B to the mixed solution A under ice bath conditions, and fully stir for 30 minutes to obtain a uniform mixed solution C, and then age the uniform mixed solution C for 15 hours at room temperature to obtain a uniform gel mixture. The proportion of homogeneous gel mixture is Al 2 o 3 :P 2 o 5 : SiO 2 :TEAOH=1:0.95:0.7:2.

[0035] Step 4: Transfer the homogeneous gel mixture obtained in Step 3 to a stainless steel autoclave lined with polytetrafluoroe...

Embodiment 2

[0037] In this example, the preparation method of nano-SAPO-34 molecular sieve is similar to Example 1, the difference is that Al 2 o 3 with P 2 o 5 The molar ratio is 0.1, such as figure 2 As shown, the finally obtained SAPO-34 molecular sieve has poor crystallinity and many amorphous products appear.

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Abstract

The invention relates to a preparation method of nanometer SAPO-34 molecular sieve. Firstly, aluminum source and phosphoric acid are mixed, left standing under low temperature condition, silicon source and template agent are mixed under low temperature condition and stirred for a certain period of time, and then added to aluminum phosphorus In the mixed solution, stir and mix at low temperature for a period of time to form a uniform mixture, then age at room temperature for a certain period of time, transfer the resulting mixture to a high-pressure reactor, and crystallize at a certain temperature for a period of time. After the crystallization is completed, cool at room temperature and solidify The phase product was washed with deionized water, dried, and then calcined at a temperature of 580°C in air to obtain SAPO‑34 molecular sieve. The synthesis process of the SAPO-34 molecular sieve synthesized by the present invention does not need to add solvents such as water, reduces solvent emissions, reduces pollution, saves energy, and synthesizes the SAPO-34 molecular sieve of nanocrystals under low temperature mixing conditions. For SAPO-34 The industrial promotion and application of molecular sieves is of great significance.

Description

technical field [0001] The invention relates to the field of nanometer SAPO-34 molecular sieves, in particular to a method for preparing nanometer SAPO-34 molecular sieves by mixing and synthesizing nanometer SAPO-34 molecular sieves at low temperature in an ultra-concentrated system. 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 cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54
CPCC01B39/54
Inventor 狄春雨任雅梅
Owner 深圳科冠华太新材料技术有限公司
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