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Method for synthesizing hierarchical-pore SAPO-34 molecular sieve through post-treatment of solid acid

A molecular sieve and multi-stage pore technology, applied in the field of solid acid post-treatment to synthesize multi-stage pore SAPO-34 molecular sieve, can solve problems such as environmental pollution and a large amount of waste water, and achieve the advantages of reducing environmental pollution, saving costs, and reducing the discharge of waste liquid. Effect

Active Publication Date: 2017-10-24
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above methods for introducing multi-level pores all need to use a large amount of water as a reaction solvent, resulting in a large amount of waste water and environmental pollution.

Method used

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  • Method for synthesizing hierarchical-pore SAPO-34 molecular sieve through post-treatment of solid acid
  • Method for synthesizing hierarchical-pore SAPO-34 molecular sieve through post-treatment of solid acid
  • Method for synthesizing hierarchical-pore SAPO-34 molecular sieve through post-treatment of solid acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 10 g of commercial SAPO-34 molecular sieve and 0.10 g of solid-phase oxalic acid, put them into a pulverizer and pulverize them, so that the solid-state reactants are uniformly mixed. Then the raw material was transferred to a 100ml polytetrafluoroethylene-lined stainless steel autoclave, and placed in an oven, and reacted at 60° C. for 6 hours to obtain a multi-stage porous SAPO-34 molecular sieve.

[0032] figure 1 It is the XRD characterization result of the product, it can be seen that the product is a typical CHA structure and has a good relative crystallinity.

[0033] figure 2 It is the SEM scanning electron microscope photo of the product. It can be seen that the particles of the product are cubic crystals of 1-4 μm, and the surface is not significantly different from the original powder.

Embodiment 2

[0035] Weigh 10 g of commercial SAPO-34 molecular sieve and 0.20 g of solid-phase oxalic acid, put them into a pulverizer and pulverize them, so that the solid-state reactants are evenly mixed. Then the raw material was transferred to a 100ml polytetrafluoroethylene-lined stainless steel autoclave, and placed in an oven, and reacted at 80°C for 6h to obtain a multi-stage porous SAPO-34 molecular sieve.

[0036] image 3 It is the XRD characterization result of the product, it can be seen that the product has a typical CHA structure and has good crystallinity.

[0037] Figure 4 It is the SEM scanning electron microscope photo of the product. It can be seen that the particles of the product are cubic crystals of about 1-4 μm, and the surface is slightly rougher than that of the original industrial molecular sieve powder.

Embodiment 3

[0039] Weigh 10 g of commercial SAPO-34 molecular sieve and 0.30 g of solid oxalic acid, put them into a pulverizer and pulverize them, so that the solid reactants are uniformly mixed. Then the raw material was transferred to a 100ml polytetrafluoroethylene-lined stainless steel autoclave, and placed in an oven, and reacted at 100°C for 6h to obtain a multi-stage porous SAPO-34 molecular sieve.

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Abstract

The invention discloses a method for synthesizing a hierarchical-pore SAPO-34 molecular sieve through post-treatment of solid acid, which relates to the field of synthesis of molecular sieves. The method comprises the following steps: uniformly smashing and mixing raw powder of a SAPO-34 molecular sieve and the solid acid, and performing a reaction on an obtained mixture at the temperature of 20-120 DEG C for 2-12h, so as to obtain the hierarchical-pore SAPO-34 molecular sieve. According to the method, water or other solvents is / are not used in a treatment process, so that the discharge of effluents is reduced, the cost is saved, the pollution is reduced, and the method has the potential economic value and social value; the obtained hierarchical-pore SAPO-34 molecular sieve can realize hierarchical-pore compounding and is good in the degree of crystallinity, and the catalytic performance can be greatly improved.

Description

technical field [0001] The invention relates to the field of synthesis of molecular sieves, in particular to a method for synthesizing multi-level porous SAPO-34 molecular sieves after solid acid post-treatment. Background technique [0002] Molecular sieves have attracted widespread attention due to their excellent physical and chemical properties. Their adjustable acidity, high thermal stability, high hydrothermal stability and specific pore structure have made them widely used in the field of industrial catalysis. With the continuous rise of crude oil prices, the preparation of light olefins (MTO) from methanol has become the most promising process to replace the production of light olefins from petroleum routes. Among them, SAPO-34 molecular sieve has become one of the best catalysts for MTO reaction because of its relatively small pore diameter, suitable acid strength and high hydrothermal stability. However, SAPO-34 molecular sieves are prone to deactivation due to ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54
CPCC01B39/54C01P2002/72C01P2004/03C01P2004/61
Inventor 任淑刘子玉陈新庆吴丹杨承广丘明煌金秋魏伟孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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