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Nanoscale sheet-SAPO-34 molecular sieve and synthetizing method thereof

A SAPO-34, nano-scale technology, applied in the direction of molecular sieve characteristic silicoaluminophosphate, molecular sieve and alkali-exchanged phosphate, etc., can solve the problems of complex synthesis method and high cost of SAPO-34 molecular sieve, and shorten the molecular diffusion path and reduce the cost. The effect of increased rate and simple process

Inactive Publication Date: 2015-10-21
青岛理健新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a nanoscale flake SAPO-34 molecular sieve and its synthetic method in order to solve the complex and costly problems of existing SAPO-34 molecular sieve synthesis methods

Method used

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  • Nanoscale sheet-SAPO-34 molecular sieve and synthetizing method thereof
  • Nanoscale sheet-SAPO-34 molecular sieve and synthetizing method thereof
  • Nanoscale sheet-SAPO-34 molecular sieve and synthetizing method thereof

Examples

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Effect test

Embodiment 1

[0023] Example 1 Add pseudoboehmite, phosphoric acid, ammonium dihydrogen phosphate, white carbon black, cetyltrimethylammonium bromide and water into a three-necked flask, connect a condenser to the three-necked flask, and place the above mixture in an oil bath The reaction was stirred at reflux for 24 hours at 75°C. Then, triethylamine was added into the three-necked flask, and the stirring reaction was continued for 4 hours at room temperature (25° C.). Take Al 2 o 3 Pseudoboehmite in terms of P 2 o 5 Phosphoric acid and ammonium dihydrogen phosphate, SiO 2 The calculated molar ratio of white carbon black, cetyltrimethylammonium bromide, triethylamine and water is 1:1:0.3:0.1:3:100. Wherein, the molar ratio of phosphoric acid to ammonium dihydrogen phosphate is 4:1. The obtained sol was put into a hydrothermal reaction kettle, and crystallized at 200° C. for 50 hours. The crystallized mixture was filtered, the obtained solid was washed with deionized water at room ...

Embodiment 2

[0025] Example 2 Pseudoboehmite, phosphoric acid, ammonium dihydrogen phosphate, silica sol, cetyltrimethylammonium bromide and water were added into a three-necked flask, a condenser was connected to the three-necked flask, and the above mixture was placed in an oil bath The reaction was stirred and refluxed at 50°C for 48 hours. Then, triethylamine was added into the three-necked flask, and the stirring reaction was continued at room temperature (25° C.) for 12 hours. Take Al 2 o 3 Pseudoboehmite in terms of P 2 o 5 Phosphoric acid and ammonium dihydrogen phosphate, SiO 2 The molar ratio of silica sol, cetyltrimethylammonium bromide, triethylamine and water is 1:0.8:0.2:0.1:3:100. Wherein, the molar ratio of phosphoric acid to ammonium dihydrogen phosphate is 10:1. The obtained sol was put into a hydrothermal reaction kettle, and crystallized at 200° C. for 50 hours. The crystallized mixture was filtered, the obtained solid was washed with deionized water at room te...

Embodiment 3

[0027] Example 3 Add pseudo-boehmite, phosphoric acid, ammonium dihydrogen phosphate, silica sol, cetyltrimethylammonium bromide and water into a three-necked flask, and stir and reflux in an oil bath at 80°C for 36 hours. Then, triethylamine was added into the three-necked flask as a template agent, and the stirring reaction was continued for 8 hours at room temperature (25° C.). Take Al 2 o 3 Pseudoboehmite in terms of P 2 o 5 Phosphoric acid and ammonium dihydrogen phosphate, SiO 2 The calculated molar ratio of silica sol, cetyltrimethylammonium bromide, triethylamine and water is 1:1.2:1:0.2:4:50. Wherein, the molar ratio of phosphoric acid to ammonium dihydrogen phosphate is 1:1. The obtained sol was put into a hydrothermal reaction kettle, and crystallized at 220° C. for 10 hours. The crystallized mixture was filtered, the obtained solid was washed with deionized water at room temperature (25°C), dried at 120°C for 8 hours, and then calcined at 550°C for 3 hours ...

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Abstract

The invention belongs to the technical field of synthesis of a molecular sieve material, and relates to a nanoscale sheet-SAPO-34 molecular sieve and a synthetizing method thereof. The nanoscale sheet-SAPO-34 molecular sieve is mainly prepared from synthetizing an aluminum source, a phosphorus source, a silicon source, a formwork agent and water, wherein the aluminum source is pseudo-boehmite; the formwork agent is a composite formwork agent consisting of a first formwork agent and a second formwork agent; the molar ratios of the components forming sol are shown as follows: 1 part of Al2O3 is used as a standard, 0.8-1.2 parts of P2O5, 0.2-1.0 part of SiO2, 2-4 parts of the first formwork agent, 0.1-0.2 part of the second formwork agent, and 20-100 parts of H2O. According to the nanoscale sheet-SAPO-34 molecular sieve and the synthetizing method thereof, disclosed by the invention, a composite phosphorus source and a composite formwork agent are adopted, a hydrothermal method is adopted for one-step synthetizing SAPO-34 sheet-nanometer crystals, the process is simple, and cetyl trimethyl ammonium bromide(CTAB) is a frequently-used surfactant for industrial use, and is low in cost. The thickness of the prepared SAPO-34 molecular sieve is only scores of nanometers, and the diffusion path of molecules is obviously shortened.

Description

technical field [0001] The invention belongs to the technical field of synthesis of molecular sieve materials, and relates to a nanoscale flake SAPO-34 molecular sieve and a synthesis method thereof. Background technique [0002] SAPO-34 is a silicon-containing aluminum phosphate molecular sieve material with a CHA structure. Due to its unique pore size and cage structure, excellent thermal stability, and strong acidity, it is used in the reaction of methanol to light olefins (MTO) in process. The 0.38nm pore size microporous structure of SAPO-34 is very suitable for shape-selective catalytic reactions, especially for low-carbon olefins such as ethylene and propylene with very high selectivity. However, the small pore structure is not conducive to the diffusion of molecules in the crystal, resulting in easy carbon deposition and deactivation, which affects the life of the catalyst in use and affects the application of SAPO-34 in the catalytic process. Moreover, crystals wi...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54
Inventor 孙守理
Owner 青岛理健新材料科技有限公司
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