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Beta molecular sieve of high-content Fe in framework and preparing method of beta molecular sieve

A molecular sieve, high-content technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of low iron content, difficult Fe, easy loss and coalescence of active substances, etc., achieve good thermal and hydrothermal stability, and strengthen acid volume effect

Active Publication Date: 2016-01-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this type of method are: the iron content in the skeleton is low (generally less than 3%), the active substance is easy to lose and coalesce during use, and the synthesis steps are cumbersome
while introducing F under neutral conditions - One-step synthesis of ions as mineralizers, due to the introduction of environmentally harmful F - , increasing the difficulty of the post-processing step
If the inorganic iron salt is directly introduced as the iron source, the Fe content that can be introduced into the framework is very low, and it is very difficult to further increase the Fe content in the framework.

Method used

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  • Beta molecular sieve of high-content Fe in framework and preparing method of beta molecular sieve
  • Beta molecular sieve of high-content Fe in framework and preparing method of beta molecular sieve
  • Beta molecular sieve of high-content Fe in framework and preparing method of beta molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 0.93gFeCl 3 ·6H 2 O and 0.54g of tartaric acid were placed in a beaker, and 15mL of deionized water was added, and stirred until dissolved for later use, which was recorded as solution 1. Then take 0.054gNaOH and 0.14gNaAlO 2 In another beaker, add 4 mL of deionized water, stir until dissolved, and record it as solution 2. Take 21.4 mL of tetraethylammonium hydroxide (35%) in a three-necked flask, add 18 mL of tetraethyl silicate dropwise thereto, and stir for 30 minutes to obtain a mixed solution 3. Add the above-prepared solution 1 into the mixed solution 3, continue to stir for 30 minutes to obtain a light yellow sol, and then add the above-mentioned solution 2 into the yellow sol system. The three-necked flask was transferred to a water bath, heated and stirred at 60°C for 15 h, and then the mixture was transferred to a reaction kettle. Under the condition of 130 ℃, hydrothermal reaction 12d. The obtained product was subjected to suction filtration, washed...

Embodiment 2

[0026] Take 1.17gFeCl 3 ·6H 2 O and 0.67g of tartaric acid were placed in a beaker, and 15mL of deionized water was added, and stirred until dissolved for later use, which was recorded as solution 1. Then take 0.054gNaOH and 0.28gNaAlO 2 In another beaker, add 4 mL of deionized water, stir until dissolved, and record it as solution 2. Take 21.8 mL of tetraethylammonium hydroxide (35%) in a three-necked flask, add 18 mL of tetraethyl silicate dropwise thereto, and stir for 30 minutes to obtain a mixed solution 3. Add the above-prepared solution 1 into the mixed solution 3, continue to stir for 30 minutes to obtain a light yellow sol, and then add the above-mentioned solution 2 into the yellow sol system. The three-necked flask was transferred to a water bath, heated and stirred at 60° C. for 12 h, and then the mixture was transferred to a reaction kettle. Under the condition of 130 ℃, hydrothermal reaction 12d. The obtained product was subjected to suction filtration, wash...

Embodiment 3

[0028] Take 1.4gFeCl 3 ·6H 2 O and 0.8g of tartaric acid were placed in a beaker, and 15mL of deionized water was added, and stirred until dissolved for later use, which was recorded as solution 1. Then take 0.054gNaOH and 0.28gNaAlO 2 In another beaker, add 4 mL of deionized water, stir until dissolved, and record it as solution 2. Take 22.2 mL of tetraethylammonium hydroxide (35%) in a three-necked flask, add 18 mL of tetraethyl silicate dropwise thereto, and stir for 30 minutes to obtain a mixed solution 3. Add the above-prepared solution 1 into the mixed solution 3, continue to stir for 30 minutes to obtain a light yellow sol, and then add the above-mentioned solution 2 into the yellow sol system. The three-necked flask was transferred to a water bath, heated and stirred at 60° C. for 24 h, and then the mixture was transferred to a reaction kettle. Under the condition of 130 ℃, hydrothermal reaction 12d. Suction filter the obtained product, wash it with deionized wate...

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Abstract

The invention relates to a beta molecular sieve of high-content Fe in a framework and a preparing method of the beta molecular sieve. Tetraethylammonium hydroxide serves as a template agent, a Fe- complex serves as a Fe source, and the Fe-beta zeolite molecular sieve of high-content Fe in the framework is synthesized through a one-step method. The synthesizing method is simple, the silica-alumina ratio can be adjusted, the mass fraction of Fe in the framework can reach 3-8%, and the synthesized Fe-beta zeolite molecular sieve is neat in structure, high in crystallinity and good in application prospect.

Description

technical field [0001] The invention relates to a Beta molecular sieve with high content of Fe in the framework and a preparation method thereof. Specifically, the iron source, silicon source, aluminum source, alkali source and template are first prepared into a gel, and a Beta molecular sieve (Fe-Beta) with a high content of Fe in the framework is synthesized in one step by using hydrothermal synthesis technology. The invention belongs to the technical field of high-content heteroatom metal molecular sieves and their synthesis. Background technique [0002] Beta molecular sieve is a high silicon-aluminum ratio molecular sieve with an open three-dimensional twelve-membered ring channel structure. It is a patented product first developed by Mobil Corporation of the United States in 1976. Its unique pore structure and wide-range adjustable silicon-aluminum ratio make it have broad application prospects in the fields of catalysis and adsorption. The doping of the framework wi...

Claims

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Application Information

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IPC IPC(8): C01B39/04
Inventor 李保山张筱榕王昊
Owner BEIJING UNIV OF CHEM TECH
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