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Method for synthesizing CHA by using tetraethyl ammonium hydroxide and N,N,N-trimethyl adamantane ammonium hydroxide mixture as templating agent

A technology of tetraethylammonium hydroxide and trimethyladamantane, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of low solid phase yield and high price, and achieve high solid phase yield and low price , to avoid the effect of a large amount of waste water

Inactive Publication Date: 2016-01-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these templates all have problems such as high price or low solid-phase yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Synthesizing CHA by mixing tetraethylammonium hydroxide and N,N,N-trimethyladamantane ammonium hydroxide as a template, including the following steps:

[0016] First, by mixing tetraethylammonium hydroxide (TEAOH, 35wt.%) and N,N,N-trimethyladamantane ammonium hydroxide as a template agent (the molar ratio of TEA / TMAdA is 3:1), the 16.8296g of this template was mixed with 1.6004g of NaOH solid to obtain a mixture; then, 12.9874g of commercially available USY molecular sieves (CBV-720, molar ratio SiO 2 / Al 2 o 3 =30) was added to the mixture as a silicon source and an aluminum source; continued stirring until a homogeneous gel was obtained;

[0017] Transfer the gel to a stainless steel, polytetrafluoroethylene-lined autoclave, and conduct hydrothermal crystallization at 160°C for 3 days under static conditions; the gel ratio of the system is: SiO 2 / 0.033Al 2 o 3 / 0.2TEAOH / 0.2NaOH / 5H 2 O. After the reaction, cool at room temperature, filter the produc...

Embodiment 2

[0018] Example 2: Synthesize CHA by mixing tetraethylammonium hydroxide and N,N,N-trimethyladamantane ammonium hydroxide as a template. The basic steps are the same as in Example 1, except that the crystallization condition is 140°C. After 3 days, the SSZ-13 molecular sieve was finally obtained.

Embodiment 3

[0019] Example 3: Synthesize CHA by mixing tetraethylammonium hydroxide and N,N,N-trimethyladamantane ammonium hydroxide as a template. The basic steps are the same as in Example 1, except that the crystallization condition is 160°C. After 4 days, the SSZ-13 molecular sieve was finally obtained.

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Abstract

The present invention provides a method for synthesizing CHA by using tetraethyl ammonium hydroxide and N,N,N-trimethyl adamantane ammonium hydroxide mixture as templating agent. The method comprises: mixing TEA and TMAdA as a mixed templating agent, mixing the templating agent and NaOH, melting into an appropriate amount of water to obtain a mixed solution, adding a USY molecular sieve as a silicon source and an aluminum source, continuously stirring until obtaining a homogeneous gel, transferring the gel to an autoclave, crystallizing for a certain time at a certain temperature, cooling at a room temperature, recovering the solid phase product through filtration, washing with deionized water, drying, and calcining at a temperature of 580 DEG C in air so as to obtain the SSZ-13 molecular sieve. According to the present invention, the synthesized CHA molecular sieve has high crystallinity and high solid phase yield, and the TEA and the TMAdA are adopted as the mixed templating agent to replace the expensive TMAdA single templating agent, such that the production cost is substantially reduced, and the large-scale promotion application of SSZ-13 is easily achieved.

Description

technical field [0001] The invention belongs to the technical field of catalysts (molecular sieve preparation method), in particular to a method for synthesizing a CHA type molecular sieve by using tetraethylammonium hydroxide as a template agent. Background technique [0002] NH 3 -SCR (Selective Catalytic Reduction, SCR) technology is currently the most widely used NOx removal technology in the world. Its principle is based on NH 3 As a reducing agent, selectively catalytically reduce NOx to harmless N 2 And emissions. The key to SCR technology is to develop an efficient and stable catalyst system to adapt to various application environments such as diesel vehicles, ships, and industries. Currently, NH for industrial applications 3 -SCR catalyst is mainly V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 catalyst. The catalyst has been widely used in the denitrification of fixed-source coal-fired flue gas, and has also been introduced into the field of diesel vehicle exhaust control....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 刘庆岭付振超郭铭玉宋春风
Owner TIANJIN UNIV
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