Method for synthesizing SSZ-13 molecular sieve by double-template agent in one step and application of SSZ-13 molecular sieve

A dual-template, molecular sieve technology, used in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that SSZ-13 molecular sieve cannot be widely used, and achieve excellent selective reduction ability and wide reaction temperature. Window, high-yield effects

Inactive Publication Date: 2017-05-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the toxicity of benzyltrimethylammonium still prevents ...

Method used

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  • Method for synthesizing SSZ-13 molecular sieve by double-template agent in one step and application of SSZ-13 molecular sieve
  • Method for synthesizing SSZ-13 molecular sieve by double-template agent in one step and application of SSZ-13 molecular sieve
  • Method for synthesizing SSZ-13 molecular sieve by double-template agent in one step and application of SSZ-13 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add 0.8 g of sodium hydroxide to 40 g of deionized water at room temperature, and stir for 2 hours at room temperature until the sodium hydroxide is completely dissolved;

[0025] (2) Then add 0.5g sodium metaaluminate (content is 80%), stir until uniform;

[0026] (3) Slowly add 0.2g N,N,N-trimethyl-1-adamantanamine (content: 25%) and 0.85g choline chloride respectively, and continue to stir until uniform;

[0027] (4) continue to add 15g silica sol (content is 30%), stir to form homogeneous sol;

[0028] (5) Put the sol into a hydrothermal reaction kettle with a polytetrafluoroethylene liner, and crystallize at 155° C. for 4 days;

[0029] (6) After the crystallization is completed, the sol is cooled to room temperature, after centrifugal filtration, deionized water washing, drying, and calcining at 600°C for 5 hours to obtain SSZ-13 molecular sieve, which is designated as sample 1;

[0030] (7) The obtained SSZ-13 molecular sieve was ion-exchanged with 0.5mol / L...

Embodiment 2

[0038] (1) Add 0.7 g of sodium hydroxide to 40 g of deionized water at room temperature, and stir for 2 hours at room temperature until the sodium hydroxide is completely dissolved;

[0039] (2) Then add 0.6g sodium metaaluminate (content is 80%), stir until uniform;

[0040] (3) Slowly add 0.4g of N,N,N-trimethyl-1-adamantanamine (content: 25%) and 0.45g of choline chloride respectively, and continue stirring until uniform;

[0041] (4) continue to add 12g silica sol (content is 30%) again, stir to form homogeneous sol;

[0042] (5) Put the sol into a hydrothermal reaction kettle with a polytetrafluoroethylene liner, and crystallize at 155° C. for 4 days;

[0043] (6) After the crystallization is completed, the sol is cooled to room temperature, and after being centrifugally filtered, washed with deionized water, and dried, it is calcined at 600°C for 5 hours to obtain SSZ-13 molecular sieve, which is designated as sample 2;

[0044] After the bet test, the bet specific sur...

Embodiment 3

[0046] (1) Add 0.7 g of sodium hydroxide to 40 g of deionized water at room temperature, and stir for 2 hours at room temperature until the sodium hydroxide is completely dissolved;

[0047] (2) Then add 0.6g sodium metaaluminate (content is 80%), stir until uniform;

[0048] (3) Slowly add 0.6g of N,N,N-trimethyl-1-adamantanamine (25% content) and 0.15g of choline chloride, and continue stirring until uniform;

[0049] (4) continue to add 15g silica sol (content is 30%) again, stir to form homogeneous sol;

[0050] (5) Put the sol into a hydrothermal reaction kettle with a polytetrafluoroethylene liner, and crystallize at 155° C. for 4 days;

[0051] (6) After the crystallization is completed, the sol is cooled to room temperature, and after being centrifugally filtered, washed with deionized water, and dried, it is calcined at 600°C for 5 hours to obtain SSZ-13 molecular sieve, which is designated as sample 3;

[0052] After the bet test, the bet specific surface area of ​...

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Abstract

The invention provides a method for synthesizing an SSZ-13 molecular sieve by a double-template agent in one step. The method takes N,N,N-trimethyl adamantanamine (TMADa<+>) and choline chloride as the double-template agent and the SSZ-13 molecular sieve with a high crystallization degree and a pure phase is obtained; after Cu<2+> is loaded, the SSZ-13 molecular sieve has excellent NO selective reduction capability and high hydrothermal stability. According to the method provided by the invention, the utilization of an expensive template agent, namely the N,N,N-trimethyl adamantanamine, can be greatly reduced, so that the production cost of the SSZ-13 molecular sieve is reduced; the method utilizes a cheap template agent to replace one part of the expensive template agent and a product can be applied to an NOx elimination process of a catalyzing device of a diesel vehicle post-treatment (NH3-SCR (Selective Catalytic Reduction)) system.

Description

technical field [0001] The invention belongs to the field of chemical industry and environmental protection, and relates to the preparation of SSZ-13 molecular sieves, in particular to a method of using cheap templates to replace some expensive templates, so as to reduce the production cost of SSZ-13 molecular sieves, and the product can be applied to diesel vehicles NOx removal process in aftertreatment (NH3-SCR) system catalyst. Background technique [0002] SSZ-13 molecular sieve has a chabazite (CHA) structure, which is composed of double six-membered rings arranged in layers in the AABBCCAA manner to form a four-membered ring. It has a three-dimensional eight-membered ring structure with a channel size of 0.38nm×0.38nm, and is a small-pore molecular sieve. SSZ-13 molecular sieve has excellent hydrothermal stability, high specific surface area and more surface ion exchange sites (Yang Bo, Synthesis and application progress of SSZ-13 molecular sieve. Chemical Industry Pr...

Claims

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Application Information

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IPC IPC(8): C01B39/04B01J29/76
CPCC01B39/04B01J29/76B01J2229/18C01P2002/72C01P2006/12
Inventor 李涛范驰陈真
Owner HUAZHONG UNIV OF SCI & TECH
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