Fenton-like oxidation catalyst and application thereof

A Fenton oxidation and catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, oxidized water/sewage treatment, etc., can solve the problems of inability to generate active free radicals, poor removal effect, and difficulty in treating organic amine wastewater. Achieve the effects of accelerating the catalytic reaction speed, low cost, increasing the diffusion rate and mass transfer capacity

Inactive Publication Date: 2018-10-16
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN102060406A uses a packing stripping tower to remove ammonium in water; Chinese patent CN102167467A utilizes a vacuum degassing method to remove ammonium in water; Chinese patent CN103183393A utilizes a degassing membrane to remove ammonium in waste water under vacuum conditions; In addition to amines in water, this method has a good removal effect on amines with poor water solubility (such as fatty amines, etc.), but the removal effect on amines with good water solubility (such as alcohol amines, etc.) is poor, and This type of method is only suitable for treating high-concentration organic amine wastewater
Chinese patent CN105879872A has prepared a kind of Fenton reaction catalyst, which loads iron oxide powder on inert alumina or molecular sieve carrier, and catalyzes the degradation of biochemically treated wastewater. It is mainly used in coking wastewater, because it limits the pH of treated wastewater to 6-7 , under this condition, the system cannot generate enough active free radicals, so it is difficult to treat organic amine wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of ZSM-5 molecular sieve:

[0041] (Step B1) Mix the silica sol, aluminum sulfate, potassium hydroxide and tetrapropylammonium hydroxide uniformly according to the molar ratio of 50:1:7.5:13 to form a silica-alumina hydrogel, and stir for 2 hours;

[0042] (Step B2) Put the silica-alumina hydrogel into a stainless steel autoclave, age at 40°C for 12 hours, crystallize at 160°C for 20 hours, wash, filter, dry at 100°C for 2 hours, and roast at 600°C for 4 hours to obtain ZSM-5 Molecular sieve catalyst.

[0043] The preparation of the ZSM-5 molecular sieve catalyst of the loaded Fe element of hierarchical pores:

[0044] (Step C1) ZSM-5 molecular sieve with conventional microporous structure is placed in 0.1mol / L sodium hydroxide solution, stirred at 80°C for 1h, filtered and washed, and dried in an oven at 120°C for 2h to obtain microporous, Mesoporous hierarchical ZSM-5 molecular sieve;

[0045] (step C2) impregnating the multi-stage porous ZSM-5 molecula...

Embodiment 2

[0054] Preparation of ZSM-5 molecular sieve:

[0055] (Step B1) Mix water glass, aluminum sulfate, potassium hydroxide and tetrapropylammonium hydroxide uniformly according to a molar ratio of 55:1.1:7.2:13 to form a silica-alumina hydrogel, and stir for 2 hours;

[0056] (Step B2) Put the silica-alumina hydrogel into a stainless steel autoclave, age at 40°C for 20 hours, crystallize at 180°C for 40 hours, wash, filter, dry at 100°C for 2 hours, and roast at 550°C for 4 hours to obtain ZSM-5 Molecular sieve catalyst.

[0057] The preparation of the ZSM-5 molecular sieve catalyst of the loaded Fe element of hierarchical pores:

[0058] (Step C1) Place the ZSM-5 molecular sieve with a conventional microporous structure in a 0.3mol / L sodium carbonate solution, stir at 80°C for 2h, filter and wash, and dry in an oven at 120°C for 2h to obtain a microporous, mesogenic porous hierarchical ZSM-5 molecular sieve;

[0059] (step C2) impregnating the multi-stage porous ZSM-5 molecula...

Embodiment 3

[0068] Preparation of ZSM-5 molecular sieve:

[0069] (Step B1) Mix water glass, sodium metaaluminate, potassium hydroxide and tetrapropylammonium hydroxide uniformly according to a molar ratio of 52:1.2:7.4:15 to form a silica-alumina hydrogel, and stir for 2 hours;

[0070] (Step B2) Put the silica-alumina hydrogel into a stainless steel autoclave, age at 30°C for 12 hours, crystallize at 180°C for 36 hours, wash, filter, dry at 100°C for 2 hours, and roast at 550°C for 4 hours to obtain ZSM-5 Molecular sieve catalyst.

[0071] The preparation of the ZSM-5 molecular sieve catalyst of the loaded Fe element of hierarchical pores:

[0072] (Step C1) ZSM-5 molecular sieve with conventional microporous structure is placed in 0.3mol / L tetrapropyl ammonium hydroxide solution, stirred at 80°C for 2h, filtered and washed, dried in an oven at 120°C for 2h, and obtained Microporous and mesoporous hierarchical ZSM-5 molecular sieves;

[0073] (step C2) impregnating the multi-stage po...

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PUM

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Abstract

The invention provides a Fenton-like oxidation catalyst and application thereof. A preparation process of the Fenton-like oxidation catalyst comprises the following steps of modifying a microporous ZSM-5 molecular sieve by alkaline so as to prepare a porous ZSM-5 molecular sieve; loading Fe (iron) onto the porous ZSM-5 molecular sieve, so as to obtain the Fenton-like oxidation catalyst. The Fenton-like oxidation catalyst is used for treating the organic amine wastewater, the maximum removal rate of COD (chemical oxygen demand) in water can reach 97%, and the removal rate of ammonia nitrogen can reach 90%. Compared with the conventional organic amine wastewater treatment technique, the Fenton-like oxidation catalyst has the advantages that (1) by performing alkaline modifying, a mesoporousstructure is introduced into the microporous structure of the ZSM-5 molecular sieve, so as to solve the problems of difficulty in molecule diffusion, low catalytic degrading rate of macromolecules andthe like, and accelerate the catalytic reaction rate; (2) the cost is low, the catalyzing activity is high, and the stability is good; (3) the better COD and ammonia-nitrogen removal effect can be realized at the normal pressure and the temperature lower than 100 DEG C, the reaction system is mild, and the treatment effect is good.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a Fenton-like oxidation catalyst and its application. Background technique [0002] The rapid development of industry has promoted rapid economic growth, but it also produces industrial wastewater that is difficult to treat by conventional methods, such as high-concentration organic amine wastewater generated during catalyst production. This type of wastewater contains high concentrations of ammonia nitrogen and COD, is not easily biodegradable, and is difficult to treat with conventional biochemical methods. It must be pretreated to reduce the concentration and toxicity of organic amines before it can be further treated with conventional biochemical methods. [0003] At present, the pretreatment technology for high-concentration organic amine wastewater mainly uses the volatility of organic amines to reduce the content of organic amines in water. Chinese patent C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J35/02C02F1/72C02F9/14C02F101/38
CPCB01J29/46B01J35/023B01J35/026C02F1/001C02F1/66C02F1/722C02F1/725C02F3/00C02F9/00C02F2101/38C02F2301/08C02F2305/026
Inventor 徐国皓余金鹏王鹏飞徐华胜夏思奇张春秀
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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