Method for preparing heterogeneous Fenton-system high-stability solid catalyst

A solid catalyst and high stability technology, which is applied in the field of wastewater treatment catalysts, can solve the problems of small catalyst surface area, catalyst instability, and low treatment temperature, etc., and achieve the effect of improving specific surface area, strong practicability, and stable performance

Inactive Publication Date: 2015-05-06
SHANGHAI BODAN ENVIRONMENTAL ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the preparation of Fenton catalyst with alumina as a carrier has problems that are difficult to solve: the catalyst is unstable at low processing temperature, the specific surface of the catalyst is too small at high processing temperature, and the catalytic performance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of Catalyst A:

[0037] I) Prepare a mixture having the following composition:

[0038] a) Weigh 800g of alumina trihydrate (>200 mesh);

[0039] b) Weigh 200g Fe(NO 3 ) 3 9H 2 O;

[0040] c) Weigh 12.5g 20-60 mesh carbon powder and 37.5g 60-300 mesh carbon powder;

[0041] d) Weigh 250g of nitric acid aqueous solution (water: nitric acid=10);

[0042] e) mixing the above-mentioned substances to form a mixture;

[0043] II) Add an appropriate amount of deionized water to the mixture obtained in step I while mixing, make it fully mixed and kneaded evenly, so that Fe(NO 3 ) 3 9H 2 O is fully wetted and impregnated on alumina trihydrate, and then extruded to obtain a strip-shaped catalyst precursor with a diameter of 3mm;

[0044] Ⅲ) Calcined at 900°C for 2 hours to obtain a specific surface area of ​​58m 2 / g of Fenton solid catalyst A.

[0045] The Fenton oxidation reaction performance test conditions of catalyst A: the oxidation reaction performanc...

Embodiment 2

[0048] Preparation of Catalyst B:

[0049] I) Prepare a mixture having the following composition:

[0050] a) Weigh 600g of alumina monohydrate (>200 mesh);

[0051] b) Weigh 200g Fe 2 (SO 4 ) 3 9H 2 O and 200g FeSO 4 ·7H 2 O;

[0052] C) take by weighing 50g 20-60 order graphite and 50g 60-300 order graphite;

[0053] d) Weigh 600g of nitric acid aqueous solution (water: nitric acid=1.25);

[0054] e) mixing the above-mentioned substances to form a mixture;

[0055] II) Add an appropriate amount of deionized water to the mixture obtained in step I while mixing, make it fully mixed and kneaded, and make the soluble Fe 2 (SO 4 ) 3 9H 2 O, FeSO 4 ·7H 2 O is fully wetted and impregnated on alumina trihydrate, and then extruded to obtain a strip-shaped catalyst precursor with a diameter of 5 mm;

[0056] Ⅲ) Calcined at 900°C for 4 hours to obtain a specific surface area of ​​52m 2 / g of Fenton solid catalyst B.

[0057] The Fenton oxidation reaction performance t...

Embodiment 3

[0059] Preparation of Catalyst C:

[0060] I) Prepare a mixture having the following composition:

[0061] a) Weigh 700g of fake alumina monohydrate (>200 mesh);

[0062] b) Weigh 300g FeCl 2 4H 2 O;

[0063] c) Weigh 225g 20-60 mesh polyethylene and 75g 60-300 mesh polyethylene;

[0064] d) Weigh 400g nitric acid aqueous solution (water: nitric acid=3);

[0065] e) mixing the above-mentioned substances to form a mixture;

[0066] II) Add an appropriate amount of deionized water to the mixture obtained in step I while mixing, make it fully mixed and kneaded, and make the soluble FeCl 2 4H 2 O is fully wetted and impregnated on alumina trihydrate, and then extruded to obtain a strip-shaped catalyst precursor with a diameter of 5 mm;

[0067] Ⅲ) Calcined at 900°C for 3 hours to obtain a specific surface area of ​​96m 2 / g of Fenton solid catalyst C.

[0068] The Fenton oxidation reaction performance test conditions of catalyst C are the same as in Example 1, and the te...

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Abstract

The invention provides a method for preparing a heterogeneous Fenton-system high-stability solid catalyst. The method comprises the following steps: (I) preparing a mixture having the following compositions: alumina hydrate having a particle size greater than 200 meshes, soluble iron salts, completely burnable carbonaceous materials having respectively particle sizes of 20-60 meshes and 60-300 meshes at a weight ratio of (1:3)-(3:1) and an aqueous solution of nitric acid; (II) adding an appropriate amount of deionized water into the mixture obtained in the step (I) while mixing so that the mixture are fully mixed and uniformly kneaded and soluble iron salts are promoted to be fully wetted and impregnated on alumina hydrate and carrying out extrusion molding; and (III) calcining the molded mixture obtained in the step (II) for 1-6 hours at 900 DEG C. The heterogeneous Fenton-system high-stability solid catalyst prepared by the method, which is disclosed by the invention has the advantages of uniform distribution of active components, high loading capacity, large specific surface area, high activity, stable performance and the like.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment catalysts, in particular to a method for preparing a heterogeneous Fenton system high-stability solid catalyst. Background technique [0002] With the development of industry, the problem of water pollution is becoming more and more serious. In order to protect our environment, these organic wastewater must be treated. Fenton oxidation is a very effective method that can completely oxidize refractory organic pollutants to meet the requirements of harmless treatment. Compared with other treatment technologies, Fenton method has the advantages of simple operation, fast reaction, simple equipment, and environmental friendliness, and has been paid more and more attention in the past 20 years. [0003] Chemist Fenton discovered for the first time in 1894 that organic matter contains H 2 0 2 , Fe 2+ It can be rapidly oxidized in acidic solution. This system containing hydrogen peroxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745
Inventor 沈翰辰武广董杰
Owner SHANGHAI BODAN ENVIRONMENTAL ENG TECH
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