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Nanpsheet-shaped SAPO-34 molecular sieve as well as ultrafast preparation method and application thereof

A SAPO-34, flake-shaped technology, applied in the field of molecular sieves, can solve the problems of difficult operation and difficult industrial scale-up, and achieve the effects of small solvent consumption, short crystallization time and high yield

Inactive Publication Date: 2015-12-23
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned methods can only shorten the synthesis time from several days to one hour or several hours. At the same time, the operation of microwave-assisted synthesis and ultrasonic-assisted synthesis is difficult, and it is not easy for industrial amplification. Therefore, a simpler and more efficient method is sought. It is of great significance to synthesize a SAPO-34 catalyst with excellent performance by a rapid method

Method used

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  • Nanpsheet-shaped SAPO-34 molecular sieve as well as ultrafast preparation method and application thereof
  • Nanpsheet-shaped SAPO-34 molecular sieve as well as ultrafast preparation method and application thereof
  • Nanpsheet-shaped SAPO-34 molecular sieve as well as ultrafast preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 0.98g of aluminum isopropoxide to a mixed solution of 2.0g of tetraethylammonium hydroxide and 0.26g of water, and stir at 30°C for 5 hours to obtain a mixture; add 0.03g of white carbon black and 1.10g of phosphoric acid to In the above mixture, the stirring process was continued at 30°C for 3 hours to obtain the initial gel mixture of SAPO-34 molecular sieves; after that, the obtained initial gel mixture of SAPO-34 molecular sieves was stirred for another 3 hours in a water bath at 50°C, and the reaction system The molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture is 1.0TEAOH: 0.1SiO 2 : 1.0P 2 o 5 : 0.5Al 2 o 3 : 20H 2 O; Finally, 0.01 g of a SAPO-34 molecular sieve seed crystal with a mass fraction of 1% was added to the obtained gel. The resulting gel mixture was stirred for a further 3 hours in a 50°C water bath. The resulting gel mixture was loaded with an attached figure 1 For the stainless steel ...

Embodiment 2

[0040] Add 0.1g of aluminum oxide to a mixed solution of 0.82g of tetraethylammonium hydroxide and 0.16g of methanol (MeOH), and stir at 50°C for 2 hours to obtain a mixture; 0.018g of active silicon dioxide, 0.11g Phosphoric acid was added to the above mixture in turn, and the stirring process was continued at 30°C for 1 hour to obtain the initial gel mixture of SAPO-34 molecular sieve; after that, the obtained initial gel mixture of SAPO-34 molecular sieve was stirred again in a water bath at 80°C for 6 hour, the molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture in the reaction system is 4.0TEAOH: 0.6SiO 2 : 1.0P 2 o 5 : 2.0Al 2 o 3 :10MeOH:60H 2 O; Finally, 0.012 g of a SAPO-34 molecular sieve seed crystal with a mass fraction of 10% was added to the obtained gel. The resulting gel mixture was stirred for a further 6 hours in an 80°C water bath. The obtained gel mixture was put into a special stainless steel react...

Embodiment 3

[0042] Add 0.32g of aluminum hydroxide to a mixed solution of 1.26g of tetraethylammonium hydroxide and 0.55g of ethanol (EtOH), and stir at 40°C for 3 hours to obtain a mixture; 0.062g of ethyl silicate, 0.23g of phosphoric acid Add to the above mixture in turn, and continue to stir at 40°C for 2 hours to obtain the initial gel mixture of SAPO-34 molecular sieve; after that, stir the obtained initial gel mixture of SAPO-34 molecular sieve in a water bath at 60°C for another 4 hours, The molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture in the reaction system is 3.0TEAOH: 0.3SiO 2 : 1.0P 2 o 5 : 2.0Al 2 o 3 : 12EtOH: 48H 2 O; Finally, 0.012 g of SAPO-34 molecular sieve seed crystals with a mass fraction of 5% were added to the obtained gel. The resulting gel mixture was stirred for a further 4 hours in a 60°C water bath. The obtained gel mixture was put into a special stainless steel reactor, and the reactor was heat...

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Abstract

The invention discloses a nanosheet-shaped SAPO-34 molecular sieve with a larger specific surface area as well as an ultrafast preparation method and an application of the nanosheet-shaped SAPO-34 molecular sieve and belongs to the technical field of molecular sieves. The nanosheet-shaped SAPO-34 molecular sieve is rapidly synthesized by adopting a reaction kettle wholly made of a stainless steel material and introducing seed crystals, and the crystallization time of the SAPO-34 molecular sieve is successfully shortened to 5 min due to excellent heat transmission rate of the stainless steel reaction kettle and seed crystal induced fast crystal nucleation. The synthetic method is simple, the crystallization time is extremely short, the synthesis cost is greatly reduced, the synthesis time is greatly shortened, and meanwhile, the liquid waste pollution caused by synthesizing is effectively reduced. The yield of synthesized nanosheet-shaped SAPO-34 samples is very high and can be higher than 90%; the nanosheet-shaped SAPO-34 molecular sieve has very high light olefin selectivity in MTO (methanol to olefins) reaction, especially, the total yield of ethylene and propylene can be higher than 85%, and the nanosheet-shaped SAPO-34 molecular sieve is very suitable for industrial scale-up application.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves, and in particular relates to a nano-flaky SAPO-34 molecular sieve with a large specific surface area, an ultrafast preparation method and its application in the reaction of methanol to prepare low-carbon olefins such as ethylene and propylene. Background technique [0002] Among the several basic chemical products with the largest production and consumption in the world, ethylene and propylene rank first and second respectively. At the same time, ethylene and propylene are the cornerstones of the huge petrochemical industry. Most of the petrochemical products are derived from ethylene and propylene, so they occupy a vital position in the modern chemical system. With the continuous development of China's economy, the demand for low-carbon olefins in the domestic market continues to grow year by year, and the existing production capacity is far from meeting the demand. At present, petrole...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54B01J29/85C07C11/02C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 于吉红王宁孙启明郭冠琦
Owner JILIN UNIV
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