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A manganese-doped maghemite catalyst for thermocatalytic oxidation of formaldehyde and preparation method thereof

A technology of maghemite and manganese doping, which is applied in the field of manganese-doped maghemite catalyst and its preparation, can solve the problems of low catalytic activity, easy loss, high price, etc., and achieve high catalytic activity and light-off temperature Low, good thermal stability

Active Publication Date: 2018-06-19
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The initial catalytic activity of noble metal catalysts is good, but there are disadvantages such as high price, easy poisoning, easy loss, etc.
Transition metal catalysts have the advantages of low price and good thermal stability. The transition metal catalysts that have been studied more mainly include perovskite structure catalysts and spinel structure catalysts; Inferior disadvantages

Method used

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  • A manganese-doped maghemite catalyst for thermocatalytic oxidation of formaldehyde and preparation method thereof
  • A manganese-doped maghemite catalyst for thermocatalytic oxidation of formaldehyde and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1. Weigh 27.8g FeSO 4 ·7H 2 O (0.1mol), 54.1g FeCl 3 ·6H 2 O (0.2mol) was added into 400mL ultrapure water (x=0), and under the protection of argon, it was completely dissolved to obtain 2+ , Fe 3+ solution of metal ions.

[0019] 2. Under the protection of argon, add the metal ion solution dropwise into 210mL of 4mol / L NaOH solution, and keep stirring the solution to form a black precipitate until the precipitation is complete; then crystallize the black precipitate at a constant temperature of 90°C for 24 hours .

[0020] 3. Centrifuge the black precipitate, collect the black precipitate, wash 3 times with ultrapure water, use a freeze dryer, freeze-dry in vacuum at a temperature of -40~-50°C for 24 hours, and obtain granular manganese-doped Magnetite precursor.

[0021] 4. Grading and screening Take the 35-60 mesh manganese-doped magnetite precursor, put it in a muffle furnace and roast it at 450° C. for 4 hours to obtain a composite sample 1 .

[0022] 5. Th...

Embodiment 2

[0024] 1. Weigh 22.2g FeSO 4 ·7H 2 O (0.08mol), 54.1g FeCl 3 ·6H 2 O (0.2mol), 3.4g MnSO 4 ·H 2 O (0.02mol) was added into 400mL ultrapure water (x=0.2), and under the protection of argon, it was completely dissolved to obtain 2+ , Fe 3 + , Mn 2+ solution of metal ions.

[0025] 2. Under the protection of argon, add the metal ion solution dropwise into 210mL of 4mol / L NaOH solution, and keep stirring the solution to form a black precipitate until the precipitation is complete; then crystallize the black precipitate at a constant temperature of 90°C for 24 hours .

[0026] 3. Centrifuge the black precipitate, collect the black precipitate, wash 3 times with ultrapure water, use a freeze dryer, and freeze-dry at a temperature of -40 to -50°C for 24 hours in a vacuum. After drying, granular manganese-doped magnetic Iron ore precursors.

[0027] 4. Grading and screening Take the 35-60 mesh manganese-doped magnetite precursor, put it in a muffle furnace and roast it at 4...

Embodiment 3

[0030] 1. Weigh 13.9g FeSO 4 ·7H 2 O (0.05mol), 54.1g FeCl 3 ·6H 2 O (0.2mol), 8.5g MnSO 4 ·H 2 O (0.05mol) was added into 400mL ultrapure water (x=0.5), and under the protection of argon, it was completely dissolved to obtain 2+ , Fe 3 + , Mn 2+ solution of metal ions.

[0031] 2. Under the protection of argon, add the metal ion solution dropwise into 210mL of 4mol / L NaOH solution, and keep stirring the solution to form a black precipitate until the precipitation is complete, and then crystallize the black precipitate at a constant temperature of 100°C for 24 hours .

[0032] 3. Centrifuge the black precipitate, collect the black precipitate, wash 3 times with ultrapure water, use a freeze dryer, and freeze-dry at a temperature of -40 to -50°C for 24 hours in a vacuum. After drying, granular manganese-doped magnetic Iron ore precursors.

[0033] 4. Grading and screening Take the 35-60 mesh manganese-doped magnetite precursor, put it in a muffle furnace and roast it a...

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Abstract

The invention discloses a manganese-doped maghemite catalyst for thermocatalytic oxidation of formaldehyde and a preparation method thereof. The present invention uses iron salt and manganese salt as main raw materials, synthesizes manganese-doped magnetite precursor by sodium hydroxide co-precipitation method, and then prepares manganese for thermocatalytic oxidation of formaldehyde through washing, freeze-drying, screening, roasting and oxidation Doped maghemite catalyst. This type of catalyst is granular, has a spinel structure, and is weakly magnetic. It can effectively catalyze and oxidize high-concentration formaldehyde, and is used to remove high-concentration (>1000mL / m3) formaldehyde at 300°C, with a formaldehyde removal rate of over 90%; it has high catalytic activity, low light-off temperature, and thermal stability Good, easy to separate and recycle, no secondary pollution and low cost, etc., suitable for purification of high-concentration formaldehyde in industrial waste gas.

Description

technical field [0001] The invention belongs to the technical field of formaldehyde oxidation treatment, and in particular relates to a manganese-doped maghemite catalyst for thermocatalytic oxidation of formaldehyde and a preparation method thereof. Background technique [0002] With the rapid development of my country's industry, the problem of air pollution is becoming more and more serious, and the research and development of industrial waste gas treatment technology has received extensive attention. Formaldehyde (HCHO) is one of the important raw materials in the field of chemical production. The industrial waste gas in many production fields such as building materials, textile printing and dyeing contains a relatively high concentration of formaldehyde. Formaldehyde is a typical volatile organic compound (VOCs), which has acute toxicity, carcinogenicity, mutagenicity and other hazards, and its direct emission will cause serious harm to human health and the environment....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/72
Inventor 梁晓亮刘鹏何宏平谭伟谭服鼎
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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