Preparation method of nano SAPO (Silicon Aluminum Phosphate)-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: 2018-10-26
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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  • Preparation method of nano SAPO (Silicon Aluminum Phosphate)-34 molecular sieve
  • Preparation method of nano SAPO (Silicon Aluminum Phosphate)-34 molecular sieve
  • Preparation method of nano SAPO (Silicon Aluminum Phosphate)-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 a nano SAPO (Silicon Aluminum Phosphate)-34 molecular sieve. The preparation method comprises the following steps: mixing an aluminum source with phosphoric acid, and standing under a low-temperature condition; mixing a silicon source with a template agent under the low-temperature condition, and stirring for a certain time; then adding the mixturein an aluminum-phosphorus mixed solution, and stirring and mixing for a certain time at lower temperature, thus forming a uniform mixture; aging for a certain time at room temperature; transferring anobtained mixture into a high-pressure reaction kettle, crystallizing for a certain time at certain temperature, cooling at room temperature after completing crystallizing, washing and drying a solid-phase product with deionized water, and roasting in air at the temperature of 580 DEG C, thus obtaining the SAPO-34 molecular sieve. According to the preparation method disclosed by the invention, solvents such as water does not need to be added during a synthesis process of the nano SAPO-34 molecular sieve synthesized by the invention, emission of the solvents is reduced, pollution is reduced, and energy is saved; a nanocrystal SAPO-34 molecular sieve is synthesized under a low-temperature mixing condition, and an important significance in industrial promotion and application of the SAPO-34 molecular sieve is obtained.

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 Applications(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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