Hydrothermal synthesis method of Fe-MFI molecular sieve

A hydrothermal synthesis and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, and hydrocarbon production from oxygen-containing organic compounds, etc., can solve high production costs, poor catalytic activity and stability, and difficulty in meeting actual use requirements, etc. problem, to achieve the effect of improved catalytic conversion rate and excellent catalytic stability

Active Publication Date: 2019-08-09
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few studies on the catalytic performance of Fe-MFI molecular sieves to catalyz

Method used

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  • Hydrothermal synthesis method of Fe-MFI molecular sieve
  • Hydrothermal synthesis method of Fe-MFI molecular sieve

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Embodiment 1

[0028] A kind of hydrothermal synthesis method of Fe-MFI molecular sieve, comprises following preparation steps:

[0029] (1) Fe(NO 3 ) 3 9H 2 O, tetraethyl orthosilicate, template and deionized water in proportion to Fe(NO 3 ) 3 9H 2 O: tetraethyl orthosilicate: template agent: deionized water = 0.4g:40g:30g:100mL, mix well, keep the temperature at 50°C for 10h, then raise the temperature to 60°C for 1h, and obtain the molecular sieve precursor gel; the template agent is the solute Mass percentage composition is the tetrapropyl ammonium hydroxide aqueous solution of 25wt%;

[0030] (2) configure the crystallization auxiliary agent, the crystallization auxiliary agent is CeO 2 -RuO 2 Composite oxide powder, powder passed through a 2000-mesh sieve;

[0031] (3) After mixing the molecular sieve precursor gel and the crystallization auxiliary agent, put it in a sealed container and raise the temperature to 160-180°C, keep it warm for 3 days, then cool it to room temperatu...

Embodiment 2

[0038] A kind of hydrothermal synthesis method of Fe-MFI molecular sieve, comprises following preparation steps:

[0039] (1) Fe(NO 3 ) 3 9H 2 O, tetraethyl orthosilicate, template and deionized water in proportion to Fe(NO 3 ) 3 9H 2 O: tetraethyl orthosilicate: template agent: deionized water = 0.8g:42g:32g:100mL, mix well, keep the temperature at 50°C for 10h, then raise the temperature to 70°C for 1h, and obtain the molecular sieve precursor gel; the template agent is the solute Mass percentage composition is the tetrapropyl ammonium hydroxide aqueous solution of 25wt%;

[0040](2) configure the crystallization auxiliary agent, the crystallization auxiliary agent is CeO 2 -RuO 2 Composite oxide powder, powder passed through a 2000-mesh sieve;

[0041] (3) After mixing the molecular sieve precursor gel and the crystallization auxiliary agent, put it in a sealed container and raise the temperature to 160-180°C, keep it warm for 3 days, then cool it to room temperatur...

Embodiment 3

[0048] A kind of hydrothermal synthesis method of Fe-MFI molecular sieve, comprises following preparation steps:

[0049] (1) Fe(NO 3 ) 3 9H 2 O, tetraethyl orthosilicate, template and deionized water in proportion to Fe(NO 3 ) 3 9H 2 O: tetraethyl orthosilicate: template agent: deionized water = 1.6g:44g:34g:100mL, mix well, keep the temperature at 50°C for 10h, then raise the temperature to 80°C for 1h, and obtain the molecular sieve precursor gel; the template agent is the solute Mass percentage composition is the tetrapropylammonium bromide aqueous solution of 25wt%;

[0050] (2) configure the crystallization auxiliary agent, the crystallization auxiliary agent is CeO 2 -RuO 2 Composite oxide powder, powder passed through a 2000-mesh sieve;

[0051] (3) After mixing the molecular sieve precursor gel and the crystallization auxiliary agent, put it in a sealed container and raise the temperature to 160-180°C, keep it warm for 3 days, then cool it to room temperature,...

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Abstract

The invention discloses a hydrothermal synthesis method of a Fe-MFI molecular sieve. The method comprises the steps of (1) fully mixing an iron source, a silicon source, a template agent and deionizedwater, performing hydrolyzing, and keeping the temperature at 60-90 DEG C to obtain molecular sieve precursor gel; (2) preparing a crystallizing auxiliary agent, wherein the crystallizing auxiliary agent is CeO2-RuO2 composite oxide powder; (3) mixing the molecular sieve precursor gel with the crystallizing auxiliary agent, placing the mixture in a sealed vessel for heating to 160-180 DEG C, preserving the heat for 3 days or above, and then performing filtering, washing, drying and roasting to obtain the Fe-MFI molecular sieve. The hydrothermal synthesis method of the iron-containing MFI molecular sieve is improved, the catalytic conversion rate of the prepared iron-containing MFI molecular sieve on alpha-phenylethanol is obviously increased, and the catalytic stability of the synthesizedFe-MFI molecular sieve is superior to that of a Fe-MFI molecular sieve synthesized by means of a common synthesis method.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis, and in particular relates to a hydrothermal synthesis method of Fe-MFI molecular sieves. Background technique [0002] Molecular sieve is a kind of material with precise pore size and small pores. Generally, silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron are the basic structural units, and a type of silicon-alumina with cage or pore structure is composed of oxygen bridges formed by oxygen atoms. salt crystals. With characteristics such as larger specific surface area and shorter diffusion path, it is a good catalyst and adsorption material. [0003] Using other elements, such as some main group elements or transition metal elements with variable valence characteristics, to isomorphically replace part of the silicon, aluminum or phosphorus in the molecular sieve framework to form a heteroatom-containing molecular sieve framework is called heteroatom molecular sieve. Due to...

Claims

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Application Information

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IPC IPC(8): C01B39/08C01B39/04B01J29/46B01J37/10C07C1/20C07C15/46
CPCB01J29/46B01J37/10B01J2229/18C01B39/04C01B39/087C07C1/20C07C15/46
Inventor 张文锋廖维林严楠芮培欣范乃立雷志伟
Owner JIANGXI NORMAL UNIV
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