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Method for preparing SSZ-13 molecular sieve from Beta molecular sieve

A molecular sieve, R-1 technology, applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve the problems of unfavorable industrialization of SSZ-13 molecular sieves, limited cost reduction of template agents, and no substantial progress, etc. Achieve the effects of high yield, wide application range and high crystallinity

Active Publication Date: 2020-06-05
SHANDONG QILU HUAXIN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can reduce the use of N,N,N-trimethyl-1-adamantanamine cation and thus reduce the synthesis cost of SSZ-13 molecular sieve, the N,N,N-trimethyl-1- Molar mass of 1-adamantanamine organic cation and SiO in silicon source 2 The ratio of the molar weight of the SSZ-13 molecular sieve is also about 0.1, and the amount of N,N,N-trimethyl-1-adamantanamine organic cations is not much reduced, and the synthesis cost is still high, which is not conducive to the industrialization of SSZ-13 molecular sieves
[0007] To sum up, the technology of replacing the template in the prior art is limited in reducing the cost of the template, and there is no substantial progress

Method used

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  • Method for preparing SSZ-13 molecular sieve from Beta molecular sieve
  • Method for preparing SSZ-13 molecular sieve from Beta molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Beta molecular sieve (silicon-aluminum ratio 24) is roasted at high temperature to remove the template agent, and the roasted sample is weighed and dispersed in water evenly. Then it was transferred to a high-pressure crystallization kettle, and subjected to hydrothermal treatment at 260° C. for 5 hours, and the solid content of the slurry was 33%. After the treatment is completed, cool to room temperature to obtain a molecular sieve slurry.

[0038]Weigh a section of template agent 1-amantadine (R-1), sodium hydroxide solution and an appropriate amount of water and mix evenly to prepare a gel. The mass ratio of each component in the gel is as follows: SiO 2 :Al 2 o 3 :Na 2 O:R-1:H 2 O=1:0.042:0.12:0.012:20.

[0039] The gel was transferred into a high-pressure reactor, and stirring was started for a period of crystallization at a temperature of 120°C for 18 hours.

[0040] After the first-stage crystallization is completed, use a high-pressure pump to add the se...

Embodiment 2

[0043] Beta molecular sieve (silicon-aluminum ratio 38) is roasted at high temperature to remove the template agent, and the roasted sample is weighed and dispersed in water evenly. Then it was transferred to a high-pressure crystallization kettle, and subjected to hydrothermal treatment at 220° C. for 8 hours, and the solid content of the slurry was 38%. After the treatment is completed, cool to room temperature to obtain a molecular sieve slurry.

[0044] Weigh a section of template agent N,N,N-trimethyl-1-adamantyl ammonium hydroxide (R-1), sodium hydroxide solution and an appropriate amount of water and mix evenly to prepare a gel. The mass ratio of each component in the gel is as follows: SiO 2 :Al 2 o 3 :Na 2 O:R-1:H 2 O=1:0.0263:0.14:0.014:16.

[0045] The gel was transferred into a high-pressure reactor, and stirring was started for a period of crystallization at a temperature of 125° C. for 14 hours.

[0046] After the first-stage crystallization is completed, ...

Embodiment 3

[0049] Beta molecular sieve (silicon-aluminum ratio 93) is roasted at high temperature to remove the template agent, and the roasted sample is weighed and dispersed in water evenly. Then it was transferred to a high-pressure crystallization kettle and subjected to hydrothermal treatment at 280° C. for 4 hours, and the solid content of the slurry was 26%. After the treatment is completed, cool to room temperature to obtain a molecular sieve slurry.

[0050] Weigh a section of template agent 1,3-diaminoadamantane (R-1), potassium hydroxide solution and appropriate amount of water and mix evenly to prepare a gel.

[0051] The mass ratio of each component in the gel is as follows: SiO 2 :Al 2 o 3 :K 2 O:R-1:H 2 O=1:0.0107:0.14:0.011:18. The gel was transferred into a high-pressure reactor, and stirring was started for a period of crystallization at a temperature of 135° C. for 12 hours.

[0052] After the first-stage crystallization is completed, use a high-pressure pump to...

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Abstract

The invention relates to a method for preparing an SSZ-13 molecular sieve from a Beta molecular sieve, which belongs to the technical field of molecular sieve preparation. According to the method forpreparing the SSZ-13 molecular sieve from the Beta molecular sieve, the treated Beta molecular sieve is used as a silicon source and an aluminum source, an amantadine derivative is used as a first-stage template agent for dynamic crystallization, then a second-stage template agent is added for static crystallization, and the SSZ-13 molecular sieve is prepared. According to the method for preparingthe SSZ-13 molecular sieve from the Beta molecular sieve, the use amount of an expensive template agent is greatly reduced, the production cost is reduced, the process is simple, and industrial production is facilitated; the prepared SSZ-13 molecular sieve has the advantages of high yield, high specific surface area and high crystallinity, and is wide in application range.

Description

technical field [0001] The invention relates to a method for preparing SSZ-13 molecular sieves from Beta molecular sieves, belonging to the technical field of molecular sieve preparation. Background technique [0002] Nitrogen oxides (NOx) are one of the main pollutants in the atmosphere, which can mainly cause environmental problems such as acid rain, photochemical smog, and destruction of the ozone layer. At present, the main source of this pollution in China is the increasing number of motor vehicles. With the increasingly stringent national emission regulations, how to efficiently remove nitrogen oxides from locomotive exhaust has become the top priority for reducing pollution. Ammonia selective catalytic reduction technology (NH 3 -SCR) is currently the most widely used NO in the world X Removal technology, the principle is based on NH 3 As a reducing agent, the NO X revert to harmless N 2 And emissions. [0003] SSZ-13 molecular sieve is a molecular sieve with C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48B01J29/76
CPCC01B39/48B01J29/76C01P2002/72B01J2229/18Y02A50/20
Inventor 王龙陈文勇许振甫苗植平彭立石倩翡吕云龙徐辰
Owner SHANDONG QILU HUAXIN HIGH TECH
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