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Method for synthesizing CHA molecular sieve by using tetraethyl ammonium hydroxide as templating agent

A technology of tetraethylammonium hydroxide and molecular sieves, which is applied in chemical instruments and methods, molecular sieves and alkali exchange compounds, inorganic chemistry, etc., can solve the problems of high price and low solid phase yield, and achieve pollution reduction and solid phase The effect of high yield and reduced production cost

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

AI Technical Summary

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

[0013] Embodiment 1: Using tetraethylammonium hydroxide as a template to synthesize CHA molecular sieves, the steps are as follows:

[0014] First, 16.8296g template agent tetraethylammonium hydroxide (TEAOH, 35wt%) is mixed with 1.6004g NaOH solid; Then, take 12.9874g commercially available USY molecular sieve (USY zeolite is used as silicon source and aluminum source to synthesize aluminosilicate molecular sieve, This embodiment selects 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;

[0015] 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 product, wash with deionized water, and dry at 100°C for 12 ho...

Embodiment 2

[0016] Example 2: Using tetraethylammonium hydroxide as a template to synthesize CHA molecular sieve, the basic steps are the same as in Example 1, except that the crystallization condition is 3 days at 140° C. to finally obtain SSZ-13 molecular sieve.

Embodiment 3

[0017] Example 3: Using tetraethylammonium hydroxide as a template to synthesize CHA molecular sieves, the basic steps are the same as in Example 1, except that the crystallization conditions are crystallization at 160° C. for 4 days, and finally SSZ-13 molecular sieves are obtained.

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Abstract

The present invention discloses a method for synthesizing a CHA molecular sieve by using tetraethyl ammonium hydroxide as a templating agent. The method comprises: mixing a templating agent tetraethyl ammonium hydroxide (TEA) 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 to the mixed solution, 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 after completing the crystallizing, 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 used templating agent has advantages of low price and environment pollution reducing; and the Cu-based small pore molecular sieve catalyst having the CHA structure obtained through the further preparation has characteristics of excellent NH3-SCR activity, extremely high solid phase yield and substantially-reduced production cost, and is suitable for the large-scale promotion application of Cu-SSZ-13.

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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IPC IPC(8): C01B39/04
CPCC01B39/48C01B39/026
Inventor 刘庆岭付振超晋晓彤纪娜
Owner TIANJIN UNIV
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