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Cubic or sheet-shaped nano SAPO-34 molecular sieve 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 insufficient uniformity of molecular sieve crystal size and shape, long processing and synthesis time, expensive gel raw materials, etc., and achieve short processing and synthesis time, low cost, and catalytic application life long effect

Active Publication Date: 2012-08-01
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2010, Hirota et al. (Mater.Chem.Phys.123 (2010) 507) synthesized a SAPO-34 molecular sieve with an average crystal size of 75 nanometers by using TEAOH as a template agent through a dry gel conversion method, but the method obtained a molecular sieve crystal size and The shape is not uniform
It should be noted that although Top.Catal.19 (2010) 1304 mentions the preparation of nano-sized SAPO-34 molecular sieves and corresponding morphology SAPO-34 molecular sieves, the gel raw materials used in the production method provided are more expensive and the synthesis time is longer And molecular sieve yield is low

Method used

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  • Cubic or sheet-shaped nano SAPO-34 molecular sieve and application thereof
  • Cubic or sheet-shaped nano SAPO-34 molecular sieve and application thereof
  • Cubic or sheet-shaped nano SAPO-34 molecular sieve and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Mix and stir tetraethyl orthosilicate, aluminum isopropoxide, water, tetraethylammonium hydroxide and treat at 20°C under autogenous pressure for 36 hours to obtain a mixture; add phosphoric acid and in situ to the above mixture, and Stirring treatment under autogenous pressure for 12 hours to obtain the initial gel mixture of SAPO-34 molecular sieve; the molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture in the reaction system is TEAOH: 0.7SiO 2 :P 2 o 5 : Al 2 o 3 :30H 2 O: 20S (S is water); put the initial gel mixture into a microwave reactor, heat it to 180° C. under a power of 200 watts in a closed manner, and carry out constant temperature crystallization under autogenous pressure for 1 hour. Then, the solid product is centrifuged, washed with deionized water, and dried in the air at room temperature to obtain the original powder of SAPO-34 molecular sieve. SAPO-34 molecular sieve (Code SP34-1) with a medi...

Embodiment 2

[0050] Active silica, boehmite, water, and tetraethylammonium hydroxide were mixed and stirred at 60°C for 10 hours under autogenous pressure to obtain a mixture; phosphoric acid and water were added to the above mixture in situ, and autogenous Stir under pressure for 0.5 hours to obtain SAPO-34 molecular sieve; the molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture in the reaction system is 1.2TEAOH: 0.7SiO 2 : 1.1P 2 o 5 : Al 2 o 3 :30H 2 O: 10S (S is water); put the obtained initial gel mixture into a microwave reactor, heat it to 160° C. under a power of 200 watts in a closed manner, and carry out constant temperature crystallization under autogenous pressure for 4 hours. Then, the solid product is centrifuged, washed neutral with deionized water, and dried in the air to obtain the original powder of SAPO-34 molecular sieve. SAPO-34 flake molecular sieve (No. SP34-3). The XRD spectrum of the original powder sample...

Embodiment 3

[0054] Silica sol, aluminum isopropoxide, water, tetraethylammonium hydroxide were mixed and stirred, and treated at 60°C under autogenous pressure for 4 hours to obtain a mixture; phosphoric acid and triethylene glycol were added to the above mixture in situ , stirred for 5 hours under autogenous pressure to obtain SAPO-34 molecular sieve; the molar ratio of each component oxide, tetraethylammonium hydroxide and solvent in the initial gel mixture in the reaction system is TEAOH: 0.5SiO 2 :P 2 o 5 : Al 2 o 3 :30H 2 O: 10S (S is triethylene glycol); put the obtained initial gel mixture into a microwave reactor, heat it up to 230°C in a closed manner under 800 watts of power, and carry out constant temperature crystallization under autogenous pressure for 0.5 hours . Then, the solid product is centrifuged, washed with deionized water, and dried in the air to obtain the original powder of SAPO-34 molecular sieve. After the original powder is roasted at 550 ° C for 6 hours to...

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Abstract

The invention belongs to the technical field of molecular sieves and particularly relates to a cubic or sheet-shaped nano SAPO-34 molecular sieve and application thereof in conversion, separation and absorption of all kinds of hydrocarbons. The dimension range of the molecular sieve is within 20-300nm and is rapidly prepared by using tetraethyl ammonium hydroxide as template agent, mixing the tetraethyl ammonium hydroxide with an aluminum source, a silicon source and a phosphorus source and adding specific solvent to control gel concentration through the traditional hydrothermal or microwave heating method. The nano-scale SAPO-34 molecular sieve synthesized by adopting the method has the characteristics that the cost of raw materials for gel is low, the production speed of the molecular sieve is rapid, the preparation time of crystallized start materials is short, the reaction energy consumption is low, the yield of the molecular sieve is high, the catalytic application life is long and the catalytic effect of the molecular sieve in catalytic reaction can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves, and in particular relates to a nanometer SAPO-34 molecular sieve with a cubic or sheet shape and its application in the conversion, separation and absorption of various hydrocarbons. Background technique [0002] In 1984, United Carbide Corporation (UCC) developed a silicon-substituted aluminum phosphate series SAPO molecular sieve (USP4440871). This type of molecular sieve is a crystalline silicoaluminophosphate, and its three-dimensional skeleton structure is composed of PO 2 + , AlO 2 - and SiO 2 tetrahedron composition. Among them, SAPO-34 is a chabazite-like structure with an ellipsoidal cage composed of an oxygen eight-membered ring and a three-dimensional channel structure, and the orifice is 0.38nm×0.38nm. The suitable pore structure and acidity of SAPO-34 molecular sieve, large specific surface area, good adsorption performance, thermal stability and hydrothermal stability...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08B82Y40/00B01J29/85
Inventor 于吉红杨国炬徐如人
Owner JILIN UNIV
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