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Silicon-aluminum-phosphate molecular sieve and synthesis method thereof

A technology of silicoaluminophosphate and synthesis method, which is applied in the field of catalysis, can solve the problems of long molecular sieve paths, and achieve the effects of short diffusion paths, not easy to block pores, and prolonged catalyst life

Pending Publication Date: 2018-01-19
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The microscopic morphology of the silicoaluminophosphate molecular sieve synthesized in the existing literature is a cube or hexagonal prism structure under the electron microscope, and it often takes a long path for molecules to diffuse into and out of the molecular sieve

Method used

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  • Silicon-aluminum-phosphate molecular sieve and synthesis method thereof
  • Silicon-aluminum-phosphate molecular sieve and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Molecular sieves were synthesized as follows:

[0031] (1) The phosphorus source, the silicon source, the aluminum source, the templating agent and water are mixed according to the molar ratio of Si:P:Al:template:water of 0.1:1:1:2:50, and the mixing sequence is to mix the aluminum source with The silicon source is mixed, then the phosphorus source is added, and finally the template is added to control the mixing rate, wherein the phosphorus source is phosphoric acid, the silicon source is silica sol, the aluminum source is pseudoboehmite, and the template is triethylamine;

[0032] (2) stirring the mixture obtained in step (1), stirring at 60° C. for 6 hours;

[0033] (3) The mixture obtained in step (2) was placed in a reactor for hydrothermal crystallization for 36 hours, and the crystallization temperature was kept at 200°C;

[0034] (4) Centrifuge the mixture obtained in step (3) at a speed of 5000 rpm for 10 minutes, wash until the pH of the filtrate is less than...

Embodiment 2

[0039] Molecular sieves were synthesized as follows:

[0040] (1) The phosphorus source, the silicon source, the aluminum source, the templating agent and water are mixed according to Si:P:Al:template agent:water molar ratio is 0.05:1:1:1.5:20, and the mixing sequence is to mix the aluminum source with Mix the silicon source, then add the phosphorus source, and finally add the template agent to control the mixing rate, wherein the phosphorus source is ammonium dihydrogen phosphate, the silicon source is water glass, the aluminum source is pseudoboehmite, and the template agent is tetraethylhydrogen A mixture of ammonium oxide and polyethylene glycol;

[0041] (2) stirring the mixture obtained in step (1), stirring at 80° C. for 2 hours;

[0042] (3) The mixture obtained in step (2) was placed in a reactor for hydrothermal crystallization for 40 hours, and the crystallization temperature was kept at 190°C;

[0043] (4) Centrifuge the mixture obtained in step (3) at a speed of...

Embodiment 3

[0050] The molecular sieves synthesized in Example 1, Example 2 and Comparative Example 1 were characterized by the nitrogen adsorption method, and the micropore and mesopore specific surface area of ​​the molecular sieve were calculated by the NLDFT method. The results obtained are shown in Table 1, as can be seen, Compared with Comparative Example 1, the micropores of Example 1 and Example 2 are closer, but the mesopore content is more abundant.

[0051] Table 1 Micropore and mesopore distribution of molecular sieves

[0052]

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Abstract

The invention discloses a silicon-aluminum-phosphate molecular sieve and a synthesis method thereof. The molecular sieve comprises elements of phosphorus, silicon, aluminum and oxygen and has the microtopography of a pyramid. The synthesis method comprises steps of mixing a silicon source, a phosphorus source, an aluminum source, water and a template agent, stirring, crystallization, washing, drying, roasting and the like. Due to the microtopography of the pyramid, molecules can be diffused within a relatively short distance inside molecular sieve channels at a relatively rapid diffusion velocity, pores in the surface of the molecular sieve are difficult to block, the selectivity of the molecular sieve is improved by 5%, and the service life of the catalyst is prolonged by one time.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a silicoaluminophosphate molecular sieve and a synthesis method thereof. Background technique [0002] Methanol-to-olefins is a kind of technology that produces low-carbon olefins by using methanol, dimethyl ether or other methanol derivatives as raw materials and reacting with catalysts. Because it can replace the petroleum route to realize the diversification of olefin raw materials and low production cost, it has attracted extensive attention in recent years. Molecular sieve catalysts used in methanol to olefins technology can generally be divided into two categories, one is the silica-alumina molecular sieve represented by ZSM-5 originally developed by Mobil Corporation, and the other is SAPO-34 originally developed by United Carbide Corporation. The representative silicoaluminophosphate molecular sieve. The former has a larger pore structure, more by-products...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54B01J29/85B01J35/02C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 王琪王晓龙刘蓉何忠肖天存
Owner CHINA HUANENG GRP CO LTD
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