Preparation method of SAPO-56/SAPO-34 composite molecular sieve

A technology of SAPO-56 and SAPO-34, which is applied in the field of preparation of SAPO-56/SAPO-34 composite molecular sieves, can solve the problems of little MTO process research and SAPO-56 molecular sieve research, and achieve high solid phase yield , regular crystal form and good crystallinity

Inactive Publication Date: 2018-11-23
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on SAPO-56 molecular sieve, and it is rarely used in MTO process research

Method used

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  • Preparation method of SAPO-56/SAPO-34 composite molecular sieve
  • Preparation method of SAPO-56/SAPO-34 composite molecular sieve
  • Preparation method of SAPO-56/SAPO-34 composite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method for synthesizing SAPO-56 / SAPO-34 composite molecular sieves with N,N,N,N-tetramethyl-1,6-hexanediamine and triethylamine, the steps are as follows:

[0026] Step 1: N,N,N,N-Tetramethyl-1,6-hexanediamine and triethylamine are fully stirred and mixed to obtain a uniform mixed solution, and then added to the aqueous solution. The molar ratio of N,N,N,N-tetramethyl-1,6-hexanediamine to triethylamine was 8.

[0027] Step 2: Pseudoboehmite (Al 2 o 3 content is 75%) was added to the above homogeneous mixed solution, stirred at room temperature for 1 hour to obtain mixed solution A, and then weighed silica sol (SiO 2 content of 40%) was added to the mixed solution A, and stirred thoroughly for 1 hour to obtain the mixed solution B. In mixed solution B, the molar ratio of aluminum source and silicon source is SiO 2 :Al 2 o 3 =0.8.

[0028] Step 3: Add 5.77g of phosphoric acid dropwise into the mixed solution B, and stir well until a uniform gel mixtur...

Embodiment 2

[0032] A kind of preparation method of synthetic SAPO-56 / SAPO-34 composite molecular sieve with N,N,N,N-tetramethyl-1,6-hexanediamine and triethylamine, the basic steps of its preparation are identical with embodiment 1 , the difference is: in step 1, the molar ratio of N,N,N,N-tetramethyl-1,6-hexanediamine and triethylamine is changed from 8 to 2, and finally SAPO-56 / SAPO- 34 composite molecular sieves, more SAPO-34 molecular sieves are formed, such as image 3 As shown in the XRD characterization results, its morphology changes to a square shape, such as Figure 4 SEM characterization picture shown.

Embodiment 3

[0034] A kind of preparation method of synthetic SAPO-56 / SAPO-34 composite molecular sieve with N,N,N,N-tetramethyl-1,6-hexanediamine and triethylamine, the basic steps of its preparation are identical with embodiment 1 , the difference is: in step 1, the molar ratio of N,N,N,N-tetramethyl-1,6-hexanediamine and triethylamine is changed from 8 to 0.8, and most of the obtained amorphous Gel-like substance.

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Abstract

The invention discloses a preparation method of a SAPO-56/SAPO-34 composite molecular sieve synthesized by N,N,N,N-tetramethyl-1,6-hexamethylenediamine and triethylamine. The preparation method comprises the steps that firstly, the N,N,N,N-tetramethyl-1,6-hexamethylenediamine and the triethylamine are fully stirred and uniformly mixed; then, the mixture is added into a water solution to obtain a mixed solution; an aluminum source and a silicon source are sequentially added into the mixed solution; the stirring is performed for a period of time until the dissolution is complete; then, phosphoric acid is dropwise added; after the stirring is performed for a period of time, uniformly mixed gel is obtained; the obtained mixture is transferred into a high-pressure reaction kettle; after the crystallization reaction, a solid-phase product is subjected to deionized water washing, filtering and drying; then, roasting is performed in a muffle furnace; the composite SAPO-56/SAPO-34 molecular sieve is obtained. The synthesized SAPO-56/SAPO-34 composite molecular sieve has the advantages that the crystal morphologies are different; the crystal form is regular; the solid phase yield is high; the foundation is laid for the further preparation and study of the composite molecular sieve.

Description

technical field [0001] The invention relates to a preparation method of a SAPO-56 / SAPO-34 composite molecular sieve, which 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. The main catalyst currently used in the MTO process is SAPO-34 molecular sieve, which belongs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
CPCC01B37/08C01B39/54C01P2002/72C01P2004/03C01P2004/80
Inventor 袁龙刘庆岭周君梦吕双春徐双
Owner CHIA TAI ENERGY MATERIALS DALIAN
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