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Preparation method for rapidly synthesizing Cu-SSZ-13 molecular sieve with low silica-alumina ratio and application of Cu-SSZ-13 molecular sieve

A technology of cu-ssz-13 and low silicon-aluminum ratio, which is applied in the field of rapid synthesis of low-silicon-aluminum ratio Cu-SSZ-13 molecular sieves, can solve the constraints of industrial scale-up application, high temperature requirements, and failure to meet engine NOx emission standards Treatment and other problems, to achieve the effect of excellent anti-hydrothermal aging stability, high metal ion exchange capacity, and excellent SCR catalytic activity

Active Publication Date: 2021-07-20
安徽纳蓝环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The National VI emission standards that will be implemented in 2021 will greatly reduce the concentration of NOx emissions. The traditional SCR catalytic reduction of NOx requires a high temperature, which can no longer meet the standard emission treatment of engine NOx.
Another literature report (Microporous and MesoporousMaterials 2014, 196, 341-348) uses the NaY molecular sieve crystallization method, without using a template, by adding Al-SSZ-13 as a seed crystal, supplemented by alkali metal ions and B 3+ The joint action of ions successfully prepared SiO 2 / Al 2 o 3 It is the CHA molecular sieve of 8-10, but adopts this method to prepare CHA, needs to add a large amount of seed crystals (about 20wt.%), and synthesis temperature is higher 170 ℃, and productive rate is lower (average yield under various synthetic conditions about 43.7%), the comprehensive cost of synthesis is relatively high, which restricts the industrial scale-up application of this method

Method used

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  • Preparation method for rapidly synthesizing Cu-SSZ-13 molecular sieve with low silica-alumina ratio and application of Cu-SSZ-13 molecular sieve
  • Preparation method for rapidly synthesizing Cu-SSZ-13 molecular sieve with low silica-alumina ratio and application of Cu-SSZ-13 molecular sieve
  • Preparation method for rapidly synthesizing Cu-SSZ-13 molecular sieve with low silica-alumina ratio and application of Cu-SSZ-13 molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, add 1.3g of solid NaOH (mass fraction 99.5%) into 30.0g of water, stir at room temperature for 0.5 hours, until the solution is clear, then add 21.0g of TMAdaOH solution (mass fraction 30%), continue stirring for 0.5h, and then add 20.0g of silicon Sodium acid aqueous solution (modulus 3.5), after stirring at room temperature for 1 hour, add 5.5 g of NaY molecular sieve (silicon-aluminum ratio: 5.1), and continue stirring at room temperature for 1 hour to obtain the initial gel. Transfer the initial gel to a 100mL stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, raise the temperature to 120°C at a speed of 5°C / min in a homogeneous reactor at a speed of 80rpm, and keep it warm for 0.5h. Then increase the temperature to 140°C at a rate of 1°C / min, keep the rotation speed constant, and crystallize for 8 hours. After the reaction, the temperature was lowered and the pressure was released. After the product was filtered and fully wash...

Embodiment 2

[0047] First, 1.82g of solid KOH (mass fraction 99.5%) was added to 30.0g of water, stirred at room temperature for 0.5 hours, and the solution was clarified, then 21.0g of TMAdaOH solution (mass fraction of 30%) was added, continued stirring for 0.5h, and then 20.0g of silicon Sodium acid aqueous solution (modulus 3.5), after stirring at room temperature for 0.5 h, add 5.5 g of NaY molecular sieve (silicon-aluminum ratio: 5.2), and continue stirring at room temperature for 0.5 h to obtain the synthetic initial gel. Transfer the initial gel to a 100mL stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, raise the temperature to 120°C at a speed of 5°C / min in a homogeneous reactor at a speed of 100rpm, and keep it warm for 0.5h. Then increase the temperature to 140°C at a rate of 1°C / min, keep the rotation speed constant, and crystallize for 12 hours. After the reaction, the temperature was lowered and the pressure was released. After the product w...

Embodiment 3

[0051] First, add 1.3g of solid NaOH (mass fraction 99.5%) into 30.0g of water, stir at room temperature for 0.5 hours, until the solution is clear, then add 21.0g of TMAdaOH solution (mass fraction 30%), continue stirring for 0.5h, and then add 20.0g of silicon Sol (SiO 2 Mass fraction 30%), after continuing stirring at room temperature for 0.5h, add 5.5g NH 4 Y molecular sieve (silicon-aluminum ratio: 2.5), continue to stir at room temperature for 0.5h to obtain the initial gel. Transfer the initial gel to a 100mL stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, raise the temperature to 120°C at a speed of 5°C / min in a homogeneous reactor at a speed of 100rpm, and keep it warm for 0.5h. Then increase the temperature to 140°C at a rate of 1°C / min, keep the rotation speed constant, and crystallize for 18h. After the reaction, the temperature was lowered and the pressure was released. After the product was filtered and fully washed, it was dr...

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Abstract

The invention discloses a preparation method for rapidly synthesizing a Cu-SSZ-13 molecular sieve with a low silica-alumina ratio, which comprises a process of synthesizing an SSZ-13 molecular sieve with a silica-alumina ratio of 4-10 under the combined action of an organic template agent and inorganic cations by taking a Y molecular sieve as an aluminum source.

Description

technical field [0001] The present invention designs a method for rapidly synthesizing Cu-SSZ-13 molecular sieve with low silicon-aluminum ratio, specifically, a method for rapidly synthesizing Cu-SSZ-13 molecular sieve with low silicon-aluminum ratio, which is mainly used in the field of waste gas denitrification . Background technique [0002] During the implementation of China V emission standards for motor vehicles, SCR catalysts are usually used to reduce NOx to N 2 To achieve up-to-standard emission of motor vehicle exhaust. However, the country plans to implement the "National VI a" standard on January 1, 2021, and complete the implementation of the "National VI b" standard on July 1, 2023. The National VI emission standards that will be implemented in 2021 will greatly reduce the concentration of NOx emissions. The traditional SCR catalytic reduction of NOx requires a high temperature, which can no longer meet the standard emission treatment of engine NOx. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48B01D53/86B01D53/56B01J29/76B01J37/30
CPCC01B39/48B01D53/8628B01J29/763B01J37/30B01J2229/186
Inventor 李超赵长艳王治龙田炜
Owner 安徽纳蓝环保科技有限公司
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