A kind of preparation method of multi-stage porous sapo-34 molecular sieve

A molecular sieve and multi-stage pore technology, which is applied in the direction of molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, molecular sieve and alkali-exchanged phosphate, etc., can solve the problems of expensive organic templates, inability to realize industrialization, increase synthesis cost and environmental pollution, and achieve The effect of increasing lifespan

Active Publication Date: 2022-02-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of multi-stage porous sapo-34 molecular sieve
  • A kind of preparation method of multi-stage porous sapo-34 molecular sieve
  • A kind of preparation method of multi-stage porous sapo-34 molecular sieve

Examples

Experimental program
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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 present application relates to a preparation method of multi-stage porous SAPO-34 molecular sieve, which is characterized in that, using pre-prepared aluminum phosphate balls as aluminum source and phosphorus source, mixed with silicon source, adding to a hydrothermal kettle, and adopting dry glue conversion method Synthesis of SAPO‑34 molecular sieves with hierarchical pores. The synthetic method of the multi-stage porous SAPO‑34 molecular sieve of the present invention can form a multi-stage pore structure without going through an acid-base post-treatment process or adding a mesoporous templating agent, the process is simple, and the cost of raw materials and subsequent separation steps are reduced, which is beneficial to industry Scale-up production; and the formation of multi-level pores is beneficial to the diffusion, mass transfer and heat conduction in the reaction of methanol to olefins. The SAPO‑34 molecular sieve prepared by this method exhibits excellent performance in the reaction of methanol to olefins.

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 Patents(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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