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Manganese oxide catalyst as well as preparation method and application thereof

A manganese oxide, catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of high energy consumption, short validity period, secondary pollution, etc. , to achieve the effect of reducing formaldehyde, good durability and long use time

Inactive Publication Date: 2019-06-28
北京氦舶科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption material is mainly activated carbon, and the adsorption rate is fast at the beginning, but when the adsorption value is saturated, the activated carbon needs to be replaced, and the adsorbed formaldehyde is easy to emit, causing secondary pollution
The main component of enzyme catalysis is plant extract factor, the validity period is short, and it is easy to stink after long-term use
Catalytic oxidation includes photocatalyst catalysis and metal oxide catalysis. Photocatalyst catalysis mainly refers to nano-titanium dioxide, which can degrade formaldehyde into carbon dioxide and water that are not polluting to the air. It has a long service life, but it needs to be reacted under ultraviolet light. Larger; metal oxide catalysis mainly refers to the transition metal manganese oxide, which mainly loads manganese oxide powder on the activated carbon carrier, showing high catalytic activity for degrading formaldehyde, but the pore size of the activated carbon carrier is blocked, and the degradation rate of formaldehyde decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method for preparing the manganese-modified NiAl-LDHs precursor material that the nickel-aluminum molar ratio is 2:1 may further comprise the steps:

[0018] According to the molar ratio of nickel nitrate / aluminum nitrate is 2:1, the molar ratio of nickel nitrate / urea is 1:3, make 70mL mixed salt solution, add a small amount of manganese nitrate in the mixed salt solution in advance, the molar ratio of manganese nitrate and nickel nitrate It is 1:10.

[0019] Put the prepared mixed salt solution in a 100mL autoclave, react in an oven at 130°C for 24h, then centrifuge the prepared slurry with deionized water until the pH of the supernatant is 7, and place it in an oven at 90°C After drying for 12 hours, a manganese-modified NiAl-LDHs precursor material was obtained.

[0020] Calcining the manganese-modified NiAl-LDHs precursor material prepared above at 450° C. for 4 h with a heating rate of 5° C. / min can obtain a manganese oxide-modified highly active supported man...

Embodiment 2

[0026] The method for preparing the NiAl-LDHs precursor with a nickel-aluminum molar ratio of 3:1 comprises the following steps:

[0027] According to the molar ratio of nickel nitrate / aluminum nitrate is 3:1, the molar ratio of nickel nitrate / urea is 1:4, make 70mL mixed salt solution, add a small amount of manganese nitrate in the mixed salt solution in advance, the molar ratio of manganese nitrate and nickel nitrate It is 1:10.

[0028] Place the prepared mixed solution in a 100mL autoclave, react in an oven at 130°C for 24 hours, then centrifuge the prepared slurry with deionized water until the pH of the supernatant is 7, and dry it in an oven at 100°C 12h, the manganese-modified NiAl-LDHs precursor material with a molar ratio of nickel to aluminum of 3:1 was obtained.

[0029] Calcining the manganese-modified NiAl-LDHs precursor prepared above at 500° C. for 4 h with a heating rate of 5° C. / min can obtain a manganese oxide-modified highly active supported manganese oxid...

Embodiment 3

[0033] The method for preparing the NiAl-LDHs precursor with a nickel-aluminum molar ratio of 4:1 comprises the following steps:

[0034] According to the molar ratio of nickel nitrate / aluminum nitrate is 4:1, the molar ratio of nickel nitrate / urea is 1:4, make 70mL mixed salt solution, add a small amount of manganese nitrate in the mixed salt solution in advance, the molar ratio of manganese nitrate and nickel nitrate It is 1:10.

[0035] Put the prepared mixed solution in a 100mL autoclave, react in an oven at 150°C for 24 hours, then centrifuge the prepared slurry with deionized water until the pH of the supernatant is 7, and dry it in an oven at 120°C 12h, the NiAl-LDHs precursor material with a manganese-modified nickel-aluminum molar ratio of 4:1 was obtained.

[0036] Calcining the manganese-modified NiAl-LDHs precursor prepared above at 550° C. for 6 h with a heating rate of 5° C. / min can obtain a manganese oxide-modified highly active supported manganese oxide cataly...

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Abstract

The invention discloses a manganese oxide catalyst as well as a preparation method and application thereof. According to the manganese oxide catalyst, nickel-aluminum composite metal oxide is taken asa carrier, manganese oxide is taken as an active component, and the mass percentage of manganese oxide is 1%-20%. A series of nickel-aluminum lamellar composite metal hydroxide (NiAl-LDHs) materialsare prepared by virtue of a hydrothermal synthesis method, manganese nitrate (50% water solution) is added for modification, the materials are roasted at a high temperature to be converted into corresponding composite metal oxides, and the high-activity loaded manganese oxide catalyst is prepared. The catalyst is applied to a formaldehyde degradation process, and a result shows that the degradation removal rate of the catalyst to formaldehyde reaches over 90% under normal-temperature and normal-pressure natural conditions.

Description

technical field [0001] The invention relates to a highly active loaded manganese oxide catalyst prepared by a layered precursor method, which is mainly used in the formaldehyde degradation reaction process. Background technique [0002] With the rapid development of social economy and the gradual improvement of people's living standards, people's requirements for environmental protection and air quality are becoming more and more stringent. Among them, formaldehyde is the most serious indoor pollution. Low-concentration formaldehyde can irritate the eyes and mucous membranes of the respiratory tract of the human body, causing abnormalities in the liver system, respiratory system and nervous system; and long-term exposure to high-concentration formaldehyde can lead to the occurrence of various cancers. The Institute for Cancer Research has defined formaldehyde as a class 1 carcinogen. Because how to remove formaldehyde efficiently is very important to the field of environmen...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J37/08B01J37/10B01D53/86B01D53/72
Inventor 关超阳郎嘉良
Owner 北京氦舶科技有限责任公司
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