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Synthesis method of SAPO-34 type molecular sieve of CHA structure and obtained MTO (Methanol To Olefins) catalyst

A technique for the synthesis of SAPO-34, applied in molecular sieve catalysts, molecular sieves and base-exchanged phosphates, physical/chemical process catalysts, etc., can solve the problem of synthetic samples mixed with amorphous phase products and miscellaneous crystals, which affect the stability of MTO process , uneven distribution, etc., to overcome the long crystallization time, improve crystallization synthesis efficiency, and uniform particle size distribution

Active Publication Date: 2019-04-26
GUANGDONG SITONG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when using traditional heating techniques, it is easy to cause some synthetic samples to be mixed with amorphous phase products and miscellaneous crystals, reducing the nucleation rate
Further, the low nucleation rate of SAPO-34 easily leads to crystallization time of tens of hours, which makes more particles aggregate and cause the particle size to exceed 1 μm, or even several microns, and the distribution is uneven, thus affecting the stability in the MTO process

Method used

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  • Synthesis method of SAPO-34 type molecular sieve of CHA structure and obtained MTO (Methanol To Olefins) catalyst
  • Synthesis method of SAPO-34 type molecular sieve of CHA structure and obtained MTO (Methanol To Olefins) catalyst
  • Synthesis method of SAPO-34 type molecular sieve of CHA structure and obtained MTO (Methanol To Olefins) catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Synthetic SAPO-34 type molecular sieve with CHA structure comprises the following steps:

[0044] Preparation of precursor synthesis liquid: mix 19.0g orthophosphoric acid and 85.0g deionized water evenly, add 15.0g acetylacetone at room temperature, slowly add 11.5g pseudo-boehmite to the above system under stirring and stir to form a uniform sol, then Add 30.4g of triethylamine dropwise to the above-mentioned sol system, then slowly add 1.80g of fumed silicon dioxide, and fully stir to form a precursor synthesis liquid, wherein the molar ratio of each raw material in the precursor synthesis liquid is: A l 2 o 3 :P 2 o 5 :ACAC:TEA:SiO 2 : H2O=1:1.1:2:4:0.4:70;

[0045] Precursor synthesis and liquid crystallization: the precursor synthesis solution was placed in a stainless steel crystallization kettle lined with polytetrafluoroethylene, and statically crystallized at 453K for 12 hours to obtain a crystallized product;

[0046] Separation of the crystallized produ...

Embodiment 2

[0052] The specific steps are the same as in Example 1, except that 3.00g acetylacetone is added, and the molar ratio of each raw material in the precursor synthesis liquid is: Al 2 o 3 :P 2 o 5 :ACAC:TEA:SiO 2 : H2O=1:1.1:0.4:4:0.4:70.

[0053] The quality of the synthesized product was 6.14 g, and the calculated yield was 29%.

[0054] Repeat the experiment on the SAPO-34 molecular sieve prepared by the above method for three times, and the yield error of the prepared molecular sieve is not more than 6%.

Embodiment 3

[0056] The specific steps are the same as in Example 1, except that 7.50g acetylacetone is added, and the molar ratio of each raw material in the precursor synthesis liquid is: Al 2 o 3 :P 2 o 5 :ACAC:TEA:SiO 2 : H2O=1:1.1:1:4:0.4:70.

[0057] The quality of the synthesized product was 7.15 g, and the calculated yield was 34%.

[0058] Repeat the experiment on the SAPO-34 molecular sieve prepared by the above method for three times, and the yield error of the prepared molecular sieve is not more than 5%.

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Abstract

The invention discloses a synthesis method of a SAPO-34 type molecular sieve of a CHA structure and an obtained MTO (Methanol To Olefins) catalyst, belongs to the technical field of molecular sieve materials and aims to solve the technical problem that a conventional hydrothermal synthesis method is long in crystallization time and slow in synthesis velocity in SAPO-34 type molecular sieve synthesis. According to the technical scheme, on the basis that the SAPO-34 type molecular sieve is synthesized by using the hydrothermal synthesis method, after a phosphorus source is mixed with deionized water and before an aluminum source is added, acetylacetone, which is used as an aid, is added into the synthesis system, and then the synthesis velocity of the SAPO-34 type molecular sieve is increased. The SAPO-34 type molecular sieve prepared with the method can be effectively applied to MTO processes.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve materials, and in particular relates to a synthesis method of a SAPO-34 type molecular sieve with a CHA structure and an obtained MTO catalyst. Background technique [0002] Silicoaluminophosphate (SAPO) is a new generation of microporous molecular sieves used in various chemical and petrochemical processes. SAPO-34 has an eight-membered ring channel with a pore size of 0.38nm and a CHA topology. It is a very effective acidic catalyst and can be used as an adsorbent for membranes and adsorption reactions. SAPO-34 molecular sieve has relatively mild acidity, excellent thermal stability and hydrothermal stability, shape-selective catalytic properties of small pores, and the selectivity to low-carbon olefins such as ethylene and propylene is as high as 80%. MTO) process can almost completely convert methanol. [0003] At present, the method used to prepare SAPO-34 molecular sieve is mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85
CPCC01B37/08C01B39/54B01J29/85C01P2002/72C01P2004/03C01P2004/62
Inventor 刘旭光王添漪王志义张萍萍张宝泉
Owner GUANGDONG SITONG GROUP
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