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Slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content, preparation method and application thereof

A technology of SAPO-34 and molecular sieve, which is applied in the field of molecular sieves, can solve the problems of uncontrollable low-silicon SAPO-34 molecular sieve synthesis and troubles, and achieve the effects of reducing carbon deposition, increasing diffusion rate, and prolonging catalytic life

Active Publication Date: 2014-03-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the synthesis, the uncontrollable silicon content brings trouble to the synthesis of low silicon SAPO-34 molecular sieves

Method used

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  • Slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content, preparation method and application thereof
  • Slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content, preparation method and application thereof
  • Slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Mix aluminum isopropoxide, water, and tetraethylammonium hydroxide thoroughly and then treat at 25°C for 2 hours to obtain a mixture; add silica sol and phosphoric acid to the above mixture in situ, and continue stirring for 5 hours to obtain SAPO-34 Molecular sieve initial gel mixture; the molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture in the reaction system is 1.0TEAOH:0.3SiO 2 : 1.2P 2 o 5 : 1.0Al 2 o 3 : 42.8H 2 O; put the initial gel mixture into a stainless steel reaction kettle with polytetrafluoroethylene lining, then put the reaction kettle in an oven, heat up to 170°C, and carry out constant temperature (170°C) under hydrothermal conditions under autogenous pressure ) crystallized for three days. Then, the solid product was separated by centrifugation, washed repeatedly with deionized water until neutral, and dried in the air at 75°C to obtain the original SAPO-34 molecular sieve powder, which was ...

Embodiment 2

[0043] Boehmite, water, and tetraethylammonium hydroxide were thoroughly mixed and stirred and treated at 25°C for 1 hour to obtain a mixture; white carbon black and phosphoric acid were added to the above mixture in situ, and the stirring was continued for 7 hours to obtain SAPO- 34 molecular sieve initial gel mixture; the molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture in the reaction system is 2.0TEAOH: 0.9SiO 2 : 2.0P 2 o 5 : 1.0Al 2 o 3 : 200.0H 2 O; put the initial gel mixture into a stainless steel reaction kettle with polytetrafluoroethylene lining, then put the reaction kettle in an oven, heat up to 200 °C, and carry out constant temperature (200 °C) under hydrothermal conditions under autogenous pressure ) crystallized for 7 days. Then, the solid product was separated by centrifugation, washed repeatedly with deionized water until neutral, and dried in the air at 75°C to obtain the original SAPO-34 molecul...

Embodiment 3

[0045] Mix Al2O3, water, and tetraethylammonium hydroxide thoroughly and then treat it at 25°C for 4 hours to obtain a mixture; add silica sol and phosphoric acid to the above mixture in situ, and continue stirring for 2 hours to obtain SAPO-34 Molecular sieve initial gel mixture; the molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture in the reaction system is 1TEAOH: 0.7SiO 2 : 1.5P 2 o 5 : 1.0Al 2 o 3 : 140H 2 O; put the initial gel mixture into a stainless steel reaction kettle with polytetrafluoroethylene lining, then put the reaction kettle in an oven, heat up to 150°C, and carry out constant temperature (150°C) under hydrothermal conditions under autogenous pressure ) crystallized for 1 day. Then, the solid product was separated by centrifugation, washed repeatedly with deionized water until neutral, and dried in the air at 75°C to obtain the original SAPO-34 molecular sieve powder, which was roasted at 600°C for...

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Abstract

The invention discloses a slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content, a preparation method and an application thereof, and belongs to the technical field of molecular sieves. Tetraethylammonium hydroxide is used as a template, the slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content is synthesized by using the traditional hydrothermal method or a solvothermal synthesis method. The synthesized nanometer SAPO-34 sample is a slice-shaped feature, of which the average crystal granularity size is 50-250nm and the thickness is 50-100nm. The synthetic method is simple and efficient; the solvent consumption is low; the yield of the synthesized nanometer SAPO-34 sample is extremely high and can be up to 85-90 percent; the synthesized nanometer SAPO-34 sample is high in low carbon olefin selectivity during reaction of methanol to olefin (MTO), particularly, the total yield of ethylene and propylene can be up to more than 83 percent, and the molecular sieve is very suitable for industrial amplification application.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves, and in particular relates to a flaky nano-SAPO-34 molecular sieve with low silicon content, large specific surface area and small size, a preparation method and its application in various hydrocarbon conversions and gas adsorption separation, especially Application in the reaction of preparing light olefins from methanol. Background technique [0002] The rapid economic development will inevitably bring about a huge demand for energy and resources, especially the market demand for low-carbon olefins (ethylene, propylene, etc.), which are important chemical raw materials, has repeatedly hit new highs. The shortage of petroleum resources has forced people to step up their search for low-carbon olefin preparation technology that does not rely on petroleum resources. The route of methanol to light olefins (MTO) is considered to be an ideal alternative process (M. Stocker. Microporous Mesopo...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54B01J20/10B01J29/85B82Y40/00B82Y30/00
Inventor 于吉红孙启明王宁喜冬阳
Owner JILIN UNIV
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