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SSZ-13 molecular sieve synthesis method

A synthesis method and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the template agent is expensive, increase the synthesis cost of SSZ-13 molecular sieve, and limit the popularization and use of SSZ-13 molecular sieve, etc. problem, to achieve the effect of easy preparation and high crystallinity

Inactive Publication Date: 2019-01-01
ZHEJIANG ZHENENG TECHN RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of the template used, the synthesis cost of SSZ-13 molecular sieve is increased, thus greatly limiting the popularization and use of SSZ-13 molecular sieve

Method used

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  • SSZ-13 molecular sieve synthesis method
  • SSZ-13 molecular sieve synthesis method
  • SSZ-13 molecular sieve synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, mix 1.658g of sodium metaaluminate (aluminum source) with 24.14g of pure water. After the dissolution is complete, add 1.100g of sodium hydroxide and stir for 10 minutes to completely dissolve. Then add 2.793g of choline chloride, stir for 15 minutes and then add 16.88g of 25wt% N,N,N-trimethyl-1-adamantanamine cation aqueous solution, vigorously stir to make it completely mixed, and dropwise Add 40.0 g of LUDOX-AS-30 silica sol (silicon source).

[0030] Stir at room temperature for 20 hours, and finally transfer the colloid to a stainless steel autoclave lined with polytetrafluoroethylene, put it in an oven at 140°C and keep it for 14 days.

[0031] The product was collected by filtration, washed until the filtrate was neutral, dried in an oven at 100°C for 12 hours, and then calcined in a tube furnace at 550°C for 8 hours to remove the template agent to obtain SSZ-13 molecular sieve.

[0032] The SEM picture and XRD spectrum of the prepared SSZ-13 molecular s...

Embodiment 2

[0034] First, mix 1.056g of sodium hydroxide with 25.27g of pure water. After the dissolution is complete, add 2.752g of aluminum isopropoxide (aluminum source), and stir rapidly to make it completely hydrolyzed. Then add 2.793g choline chloride, stir for 15 minutes and add 17.93g 25wt% N,N,N-trimethyl-1-adamantanamine cation aqueous solution, vigorously stir to make it mix completely, and gradually 41.18 g of LUDOX-AS-30 silica sol (silicon source) were added dropwise.

[0035] Stir at room temperature for 20 hours, and finally transfer the colloid to a stainless steel autoclave lined with polytetrafluoroethylene, put it in an oven at 140°C and keep it for 15 days.

[0036] The product was collected by filtration, washed until the filtrate was neutral, dried in an oven at 100°C for 12 hours, and then calcined in a tube furnace at 550°C for 8 hours to remove the template agent to obtain SSZ-13 molecular sieve.

[0037] The SEM picture and XRD spectrum of the prepared SSZ-13 m...

Embodiment 3

[0039] First, mix 1.723g of sodium metaaluminate (aluminum source) with 20g of pure water. After the dissolution is complete, add 1.300g of sodium hydroxide and stir for 10 minutes to completely dissolve. Then add 2.936g of choline chloride, stir for 15 minutes and then add 17.15g of 25wt% N,N,N-trimethyl-1-adamantanamine cation aqueous solution, vigorously stir to make it completely mixed, and dropwise 38.56 g of LUDOX-AS-30 colloidal silica (silicon source) were added.

[0040] Stir at room temperature for 20 hours, and finally transfer the colloid to a stainless steel autoclave lined with polytetrafluoroethylene, put it in an oven at 140°C and keep it for 12 days.

[0041] The product was collected by filtration, washed until the filtrate was neutral, dried in an oven at 100°C for 12 hours, and then calcined in a tube furnace at 550°C for 8 hours to remove the template agent to obtain SSZ-13 molecular sieve.

[0042] The SEM picture and XRD spectrum of the prepared SSZ-13 ...

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Abstract

The invention provides a SSZ-13 molecular sieve synthesis method, wherein the SSZ-13 molecular sieve is synthesized by using a tetravalent silicon source, a tetravalent aluminum source, hydroxide radical ions and an alkali metal compound as raw materials and using choline cations and N,N,N-trimethyl-1-ammonium adamantane as template agents. According to the present invention, the partial expensiveN,N,N-trimethyl-1-adamantanamine cation is replaced with the inexpensive choline cation as the template agent so as to significantly reduce the cost, the prepared SSZ-13 has high crystallinity, and the vanadium-free SCR catalyst capable of efficiently reducing and decomposing nitrogen oxides can be obtained through the ion exchange method.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis and relates to a synthesis method for cheaply synthesizing SSZ-13 molecular sieves. Background technique [0002] Molecular sieve material is an oxide crystal material with uniform micropores, mainly composed of aggregates of silicon-aluminum oxides, connected by oxygen bridges to form a molecular-sized pore and cavity system, and its pore size is about 0.3 to 2.0 between nm. Molecular sieve materials have rich pore structure, regular pore distribution, large specific surface area and high hydrothermal stability, and are widely used in the fields of ion exchange, adsorption separation and catalysis. [0003] The International Zeolite Association (IZA) classifies molecular sieves according to different skeleton structures, such as CHA, MFI, FAU, VFI and so on. SSZ-13 is a molecular sieve with CHA topology, which is composed of AlO 4 and SiO 4 The tetrahedrons are connected end to end by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J29/72
CPCB01J29/72C01B39/04C01P2002/72C01P2004/03C01P2004/32C01P2004/61
Inventor 陈亮周峰孔春龙
Owner ZHEJIANG ZHENENG TECHN RES INST
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