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Synthetic method of molecular sieve ZSM-5 on porous anodic oxide film of stainless steel screen

An oxide film, porous anode technology, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as bed pressure increase, concentration and temperature gradient increase, etc., to achieve good technical effects, The effect of broad application prospects

Inactive Publication Date: 2012-09-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when ZSM-5 molecular sieve acts on the fixed bed in the form of particles, it often leads to an increase in the bed pressure drop of the fixed bed, and an increase in the concentration and temperature gradient.
It is an effective way to overcome this disadvantage by synthesizing ZSM-5 molecular sieves on a suitable carrier to obtain a monolithic structure. However, related literature and research are rarely reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The synthetic method of synthesizing ZSM-5 molecular sieve on the porous anodic oxide film of stainless steel screen comprises the following steps:

[0025] (1) The stainless steel wire mesh is subjected to the pretreatment of degreasing, descaling and ultrasonic vibration in sequence;

[0026] The stainless steel wire mesh contains the following components in mass content: C: 0.05%, Si: 0.30%, Mn: 1.15%, P: 0.04%, S: 0.012%, Cr: 18.10%, Ni: 8.0%, the stainless steel wire The net is processed into required specifications (1.5cm×5cm), and made into flakes; during degreasing treatment, the concentration of the detergent solution used is 0.075~0.15wt%, the treatment temperature is 50~60°C, and the treatment time is 15 ~25min; for descaling treatment, the treatment solution is 15wt% dilute hydrochloric acid, the immersion time is 15~25min, and the treatment temperature is room temperature; the time for ultrasonic vibration treatment is 15~25min; the tetrapropylammonium hydr...

Embodiment 1

[0032] Process the stainless steel wire mesh into the required specifications (1.5cm*5cm), make it into a sheet, and wash it in a detergent solution with a concentration of 0.075wt% for 15 minutes at 50°C to remove the oil on the surface of the stainless steel wire mesh ;

[0033] Soak the above-mentioned stainless steel wire mesh in 15wt% dilute hydrochloric acid for 15 minutes to remove scale;

[0034] Vibrate the activated stainless steel wire mesh under ultrasonic conditions for 15 minutes;

[0035] The pretreated stainless steel wire mesh is completely submerged in a 5wt% HAc (acetic acid) electrolyte solution, and the current density is controlled to be 0.30A / dm 2 , the voltage is 3.0V, the time is 20min, and the anodic oxide film carrier is obtained;

[0036] 0.0813gNaAlO 2 (Sodium metaaluminate) was dissolved in 18ml deionized water, and 5.47ml TEOS (tetraethyl orthosilicate) was added dropwise under stirring, then 2.96ml TPAOH (tetrapropylammonium hydroxide) was ad...

Embodiment 2

[0040] Process the stainless steel wire mesh into the required specifications (1.5cm*5cm), make it into a sheet, and wash it in a detergent solution with a concentration of 0.10wt% for 20 minutes at 55°C to remove the oil on the surface of the stainless steel wire mesh ;

[0041] Soak the above-mentioned treated stainless steel wire mesh in 15wt% dilute hydrochloric acid for 20 minutes to remove scale;

[0042] Vibrate the activated stainless steel wire mesh under ultrasonic conditions for 20 minutes;

[0043] The pretreated stainless steel wire mesh is completely submerged in a HAc (acetic acid) electrolyte solution with a concentration of 5wt%, and the current density is controlled to be 0.40A / dm 2 , the voltage is 3.5V, the time is 25min, and the anodic oxide film carrier is obtained;

[0044] 0.0971gNaAlO 2 (Sodium metaaluminate) was dissolved in 18ml deionized water, and 5.70ml TEOS (tetraethyl orthosilicate) was added dropwise under stirring, then 3.00ml TPAOH (tetrapro...

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Abstract

The invention relates to a preparation method of a catalytic material, in particular to a synthetic method of a molecular sieve ZSM-5 on a porous anodic oxide film of a stainless steel screen. The method comprises the following steps of: forming a porous anodic oxide film by using a stainless steel screen with the porous anodic oxide film attached on the surface as a substrate material, using an HAc solution as an electrolyte and adopting an anode oxidation preparation process; and then, synthesizing a molecular sieve ZSM-5 on the surface of the porous anodic oxide film by using sodium aluminate as an aluminum source, tetraethyl orthosilicate as a silicon source, tetrapropylammonium hydroxide as a template agent and adopting an in-situ hydrothermal synthetic method. The method expands theapplication aspects of the molecular sieve ZSM-5, overcomes the defects of the powder molecular sieve in the aspects of pressure drop, temperature and concentration gradient by the integrated structure, uses the HAc solution to substrate for a traditional corrosive liquid acid, such as sulfuric acid and therefore is an environment-friendly synthetic process. The obtained molecular sieve is based on the integrated advantages of the stainless steel screen and the molecular sieve ZSM-5 and has extremely wide application prospects.

Description

technical field [0001] The invention relates to a method for preparing catalytic materials, in particular to a method for synthesizing ZSM-5 molecular sieves on stainless steel mesh porous anodic oxide membranes. technical background [0002] ZSM-5 molecular sieve is a kind of aluminosilicate zeolite molecular sieve with high silicon-aluminum ratio developed by Mobil Company of the United States. The elliptical channels of the b-axis of the cell are intersected; due to the existence of a large number of cavities in its crystal structure, there are movable water molecules and cations in the cavities, which have the advantages of ion exchangeability, acidity and large specific surface. In recent years, has become a research hotspot. [0003] In addition, ZSM-5 molecular sieve has high specific surface, regularly arranged and adjustable channels, and is widely used in many fields such as petrochemical industry, fine chemical industry and environmental protection, such as metha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01J35/10
Inventor 高园园陈敏
Owner ZHEJIANG UNIV