Preparation method of mesoporous Fe-Beta molecular sieve

A fe-beta, molecular sieve technology, applied in separation methods, molecular sieve catalysts, molecular sieves and alkali exchange compounds, etc., can solve the problems of high cost, restricting the industrial production of Fe-beta molecular sieves, limited raw material sources, etc., and achieve moderate iron oxide content. , excellent hydrothermal stability and anti-sulfur poisoning ability, the effect of wide active window temperature

Active Publication Date: 2020-06-19
SHANDONG QILU HUAXIN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in this method, Fe source is Fe-complex, and this raw material source is limited, and cost is high, has restricted the industrialized production of Beta molecular sieve containing Fe; In addition, the synthesized molecular sieve is nanometer pore structure, non-mesoporous structure, and application range is obvious. the difference

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  • Preparation method of mesoporous Fe-Beta molecular sieve
  • Preparation method of mesoporous Fe-Beta molecular sieve
  • Preparation method of mesoporous Fe-Beta molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Take iron-based molecular sieve production waste liquid, add appropriate amount of oxalic acid, adjust pH=5.3, and filter gum residue. After partial drying of the slag product, the amount and content of the silicon, aluminum, and iron oxides were detected as follows: SiO 2 :Al 2 o 3 :Fe 2 o 3 = 1:0.031:0.013. Take quantitative wet scum and disperse it in deionized water, add sodium hydroxide and tetraethylammonium hydroxide in turn, and stir evenly to prepare gel. The material ratio of each component in the gel is: SiO 2 :Al 2 o 3 :Na 2 O:Fe 2 o 3 :TEAOH:H 2 O=1:0.031:0.12:0.013:0.13:10. The gel was transferred to a dynamic crystallization kettle, and crystallized at 160° C. for 36 hours to obtain a product slurry. Fe-Beta molecular sieve (code: C-1) can be obtained after the slurry is removed from the mother liquor, washed, exchanged, dried and roasted.

Embodiment 2

[0032] Take iron-based molecular sieve production waste liquid, add appropriate amount of oxalic acid, adjust pH=4.7, and filter gum residue. After partial drying of the slag product, the amount and content of the silicon, aluminum, and iron oxides were detected as follows: SiO 2 :Al 2 o 3 :Fe 2 o 3 = 1:0.022:0.009. Take quantitative wet scum and disperse it in the filtrate, add sodium hydroxide and tetraethylammonium hydroxide in turn, and stir evenly to prepare a gel. The material ratio of each component in the gel is: SiO 2 :Al 2 o 3 :Na 2 O:Fe 2 o 3 :TEAOH:H 2 O=1:0.022:0.15:0.009:0.12:13. The gel was transferred to a dynamic crystallization kettle, and crystallized at 150° C. for 46 hours to obtain a product slurry. Fe-Beta molecular sieve (code: C-2) can be obtained after slurry is removed from mother liquor, washed, exchanged, dried and roasted.

Embodiment 3

[0034] Take iron-based molecular sieve production waste liquid, add appropriate amount of oxalic acid, adjust pH=3.3, and filter gum residue. After partial drying of the slag product, the amount and content of the silicon, aluminum, and iron oxides were detected as follows: SiO 2 :Al 2 o 3 :Fe 2 o 3 = 1:0.012:0.007. Take quantitative wet scum and disperse it in deionized water, add sodium hydroxide and tetraethylammonium hydroxide in turn, and stir evenly to prepare gel. The material ratio of each component in the gel is: SiO 2 :Al 2 o 3 :Na 2 O:Fe 2 o 3 :TEAOH:H 2 O=1:0.012:0.17:0.007:0.12:15. The gel was transferred to a dynamic crystallization kettle, and crystallized at 170° C. for 24 hours to obtain a product slurry. Fe-Beta molecular sieve (code: C-3) can be obtained after slurry is removed from mother liquor, washed, exchanged, dried and roasted.

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Abstract

The invention relates to a preparation method of a mesoporous Fe-Beta molecular sieve, and belongs to the technical field of molecular sieve preparation. The preparation method of the mesoporous Fe-Beta molecular sieve comprises the following steps: by taking rubber residues in slurry during preparation of an iron-based molecular sieve as a silicon source, an aluminum source and an iron source, adding an alkali source and a template agent to prepare gel, and then crystallizing to obtain the Fe-Beta molecular sieve. According to the preparation method of the mesoporous Fe-Beta molecular sieve,the waste slurry during preparation of the iron-based molecular sieve is fully utilized, the raw material cost is remarkably reduced, the process is simple, pollutant emission is reduced, and the prepared product has excellent performance during application.

Description

technical field [0001] The invention relates to a method for preparing a mesoporous Fe-Beta molecular sieve, which belongs to the technical field of molecular sieve preparation. Background technique [0002] Nitrogen oxides (NOx) are one of the main pollutants in the atmosphere, which can mainly cause environmental problems such as acid rain, photochemical smog, and destruction of the ozone layer. At present, the main source of this pollution in China is the increasing number of motor vehicles. With the increasingly stringent national emission regulations, how to efficiently remove nitrogen oxides from locomotive exhaust has become the top priority for reducing pollution. Ammonia selective catalytic reduction technology (NH 3 -SCR) is currently the most widely used NO in the world X Removal technology, the principle is based on NH 3 As a reducing agent, the NO X revert to harmless N 2 And emissions. The key to SCR technology is to develop an efficient and stable catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/06C01B39/48B01J29/76B01J35/10B01D53/94B01D53/56
CPCC01B39/065C01B39/48B01J29/76B01J35/1023B01D53/9418C01P2006/12B01D2251/2062
Inventor 王龙陈文勇苗植平彭立石倩翡张睿孙珂
Owner SHANDONG QILU HUAXIN HIGH TECH
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