Preparation method of hierarchical pore SAPO-34 molecular sieve

A technology of SAPO-34 and molecular sieve, which is applied in the direction of molecular sieve catalyst, molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of expensive organic templates, inability to realize industrialization, increase synthesis cost and environmental pollution, and achieve Improve selectivity, slow down the formation of carbon deposits, and increase the lifespan

Active Publication Date: 2021-01-15
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic template used is relatively expensive, which increases the synthesis cost and the environmental pollution caused by the removal of the template agent, so the method is still not industrialized

Method used

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  • Preparation method of hierarchical pore SAPO-34 molecular sieve
  • Preparation method of hierarchical pore SAPO-34 molecular sieve
  • Preparation method of hierarchical pore SAPO-34 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of aluminum phosphate balls: Add 0.1mol / L newly prepared aluminum phosphate solution and 0.1mol / L phosphoric acid solution into a beaker, stir and mix evenly, transfer to a hydrothermal kettle for 3 hours of hydrothermal treatment at 90°C, take out and cool; high-speed centrifugation and washed three times with water, and dried at 100°C to obtain spherical aluminum phosphate powder. The product is nearly spherical in shape with an average particle size of 100nm.

[0050] Mix and grind aluminum phosphate balls and white carbon black in a mortar for 20 minutes to obtain a precursor dry powder; place the obtained precursor dry powder in a polytetrafluoro cup on the upper part of the crystallization kettle, and the polytetrafluoro cup is supported by a bracket. Place deionized water and triethylamine at the bottom; the molar ratio of each component in the reactor is 1.5 triethylamine: 17H 2 O: 0.5SiO 2 : 1Al 2 o 3 : 1P 2 o 5 . Seal the crystallization ket...

Embodiment 2

[0053] Preparation of aluminum phosphate balls: Add 0.1mol / L newly prepared aluminum phosphate solution and 0.1mol / L phosphoric acid solution into a beaker, stir and mix evenly, transfer to a hydrothermal kettle for 3 hours of hydrothermal treatment at 90°C, take out and cool; high-speed centrifugation and washed three times with water, and dried at 100°C to obtain spherical aluminum phosphate powder. The product is nearly spherical in shape with an average particle size of 100nm.

[0054] Mix and grind aluminum phosphate balls and silica sol in a mortar for 20 minutes to obtain a precursor, dry it in an oven, and grind it into a powder after the water evaporates completely to obtain a dry powder of a molecular sieve precursor; In the polytetrafluoro cup on the upper part of the crystallization kettle, the polytetrafluoro cup is supported by a bracket, and deionized water and morpholine are placed at the bottom of the kettle; the molar ratio of each component in the reaction k...

Embodiment 3

[0057] Preparation of aluminum phosphate balls: Add 0.2mol / L newly prepared aluminum phosphate solution and 0.2mol / L phosphoric acid solution into a beaker, stir and mix evenly, transfer to a hydrothermal kettle for 2 hours of hydrothermal treatment at 100°C, take out and cool; high-speed centrifugation and washed three times with water, and dried at 100°C to obtain spherical aluminum phosphate powder. The product has a nearly spherical shape with an average particle size of 200nm.

[0058] Mix and grind aluminum phosphate balls, tetraethyl orthosilicate and triethanolamine in a mortar for 10 minutes to obtain dry precursor powder; place the dry precursor powder in the polytetrafluoro cup on the upper part of the crystallization kettle Supported by a bracket, deionized water is placed at the bottom of the kettle; the molar ratio of each component in the reactor is 3 triethanolamine: 20H 2 O: 0.6SiO 2 : 1Al 2 o 3 : 1P 2 o 5 . Seal the crystallization kettle and place it ...

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Abstract

The invention relates to a preparation method of a hierarchical pore SAPO-34 molecular sieve, which is characterized by comprising the following steps: mixing pre-prepared aluminum phosphate balls serving as an aluminum source and a phosphorus source with a silicon source, adding the mixture into a hydrothermal kettle, and synthesizing the SAPO-34 molecular sieve with hierarchical pores by adopting a dry glue conversion method. According to the synthesis method of the hierarchical pore SAPO-34 molecular sieve, a hierarchical pore structure can be formed without an acid-base post-treatment process or addition of a mesoporous template agent, the process is simple, the raw material cost and subsequent separation steps are reduced, and industrial scale-up production is facilitated; and the formation of the hierarchical pores is beneficial to diffusion mass transfer and heat conduction in the methanol-to-olefin reaction. The SAPO-34 molecular sieve prepared by the method shows excellent performance in a methanol-to-olefin reaction.

Description

technical field [0001] The application relates to a preparation method of a multi-level porous SAPO-34 molecular sieve, which belongs to the field of molecular sieve synthesis. Background technique [0002] Low carbon olefins, especially ethylene and propylene, are the basis of the modern chemical industry. They can synthesize various polymer materials such as plastics and rubber through self-polymerization or copolymerization reactions, and can also generate chemical intermediates through various reactions to synthesize a variety of chemical products related to the national economy and people's livelihood. At present, there are two main routes for the production of low-carbon olefins such as ethylene propylene, one is the traditional petrochemical route, and the other is the coal chemical route. my country lacks oil resources and needs to import a large amount of crude oil from abroad every year to meet domestic demand, while coal resources are relatively abundant and have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08C07C1/20C07C11/04C07C11/06B01J29/85
CPCC01B39/54C01B37/08B01J29/85C07C1/20C01P2002/72C01P2004/03C01P2004/38C01P2006/12C01P2006/14C07C11/04C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 郜贝贝贺强
Owner ZHENGZHOU UNIV
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