One-step preparation method for Cu-SSZ-13 molecular sieve

A technology of cu-ssz-13 and molecular sieve, which is applied in the field of catalysis, can solve the problems of high cost, lower market competitiveness, complex molecular sieve process, etc., and achieve the effect of easy implementation, excellent catalytic performance, and simple and reliable synthesis process

Active Publication Date: 2021-11-30
TIANJIN PASSION ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the prior art, the manufacturing method of Cu-SSZ-13 molecular sieve generally adopts the following method: add template agent to silicon source and aluminum source, stir in the presence of alkali and carry out hydrothermal synthesis, prepare hydrogen molecular sieve and then Use copper salts to load copper, and then process again to obtain Cu-SSZ-13 molecular sieves. The molecular sieves synthesized by this method are complex in process and relatively high in cost, which virtually reduces market competitiveness.

Method used

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  • One-step preparation method for Cu-SSZ-13 molecular sieve
  • One-step preparation method for Cu-SSZ-13 molecular sieve
  • One-step preparation method for Cu-SSZ-13 molecular sieve

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preparation example Construction

[0022] The preparation method of the molecular sieve provided by the embodiment of the present invention comprises:

[0023] The invention provides a method for preparing Cu-SSZ-13 molecular sieve in one step, comprising:

[0024] Step S110: mixing the template agent, modified copper silica gel, and aluminum source together in an alkaline aqueous solution, and performing a gelation reaction to obtain a gel;

[0025] Step S120: Under the action of the seed crystal, the gel undergoes a crystallization reaction to obtain a crystallized product;

[0026] Step S130: Calcining the crystallized product to obtain Cu-SSZ-13 molecular sieve.

[0027] Compared with the prior art, in the preparation method of Cu-SSZ-13 molecular sieve provided by the present invention, template agent, modified copper-silicon source, aluminum source are used as raw materials, which are mixed together in an organic alkaline aqueous solution to carry out Gelation reaction, and then under the action of the ...

Embodiment 1

[0038] This embodiment provides a method for preparing Cu-SSZ-13 molecular sieves in one step, comprising the following steps:

[0039] Embodiment one:

[0040] Step S110: Add tetrapropylammonium hydroxide, modified copper silica gel, aluminum sulfate, and an aqueous solution containing N,N,N-trimethyl-1-adamantyl ammonium hydroxide (mass Concentration is 25.0%) and deionized water, stirred at room temperature for 1h to form a gel; wherein, the molar ratio of N,N,N-trimethyl-1-adamantyl ammonium hydroxide to silicon in the modified copper silica gel is 0.08 :1, the molar ratio of silica and aluminum sulfate of modified copper silica gel is 25:1, the copper atomic mass ratio content of modified copper silica gel is 0.04, the silica of tetrapropyl ammonium hydroxide and modified copper silica gel The molar ratio is 0.4:1.

[0041]Step S120: Move the gel into the hydrothermal reaction kettle, add seed crystals, seal it well, place the hydrothermal reaction kettle in a blast ove...

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Abstract

The invention discloses a one-step synthesis method for preparation of a Cu-SSZ-13 molecular sieve. According to the method, modified copper silica gel, an aluminum source, a template agent and an organic alkali source are adopted to form gel, the Cu-SSZ-13 molecular sieve is dynamically crystallized and hydrothermally synthesized, and an obtained molecular sieve sample shows excellent catalytic performance in NH3-SCR reaction. According to the molecular sieve synthesis method provided by the invention, ammonium exchange and copper exchange are not needed, Cu-SSZ-13 is directly synthesized by the one-step method, and a synthesis process is simple, reliable and easy to implement.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a method for preparing Cu-SSZ-13 molecular sieves in one step. Background technique [0002] Nitrogen oxides (NOx) will cause a series of environmental problems such as photochemical smog, acid rain and greenhouse effect, which have seriously endangered human health. With the increase in the number of motor vehicles and the rapid development of industry, the amount of NOx emissions is increasing. Cause serious deterioration of ecology and environment. Therefore, it is urgent to eliminate the problem of NOx pollution. At present, the dominant NOx control technology is NH3 Selective Catalytic Reduction (NH3-SCR), the key to which is to select a catalyst with excellent performance, which will determine the success or failure of the entire catalytic reaction system. [0003] Selective catalytic reduction (selective catalytic reduction, abbreviated as SCR) catalyst is a catalyst u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48C01B39/04B01J29/76
CPCC01B39/48C01B39/04B01J29/763C01P2002/72C01P2004/03B01J2229/18
Inventor 梁珂王广涛
Owner TIANJIN PASSION ADVANCED MATERIAL TECH CO LTD
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