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Catalyst for room-temperature catalytic oxidation of formaldehyde and preparation method thereof

A catalytic oxidation and catalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem that formaldehyde cannot be removed at room temperature, and achieve improved electronic performance. The effects of transmission, activity improvement, and catalytic oxidation activity improvement

Active Publication Date: 2020-06-05
GUANGDONG RES INSTITITUTE OF PETROCHEM & FINE CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome that existing non-precious metal catalysts cannot remove low concentration (1~6mg / m3) at room temperature 3 ) defects and deficiencies of formaldehyde, a preparation method of a catalyst for catalytic oxidation of formaldehyde at room temperature is provided, and the active component manganese dioxide is loaded on the surface-modified acidified multi-walled carbon nanotubes, and the prepared catalyst can be realized at room temperature The low concentration (1 ~ 6mg / m 3 ) efficient decomposition of formaldehyde

Method used

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  • Catalyst for room-temperature catalytic oxidation of formaldehyde and preparation method thereof
  • Catalyst for room-temperature catalytic oxidation of formaldehyde and preparation method thereof
  • Catalyst for room-temperature catalytic oxidation of formaldehyde and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] A preparation method of a catalyst for catalytic oxidation of formaldehyde at normal temperature, comprising the steps of:

[0036] S1. Dissolve the multi-walled carbon nanotubes in nitric acid solution, the pH of the reaction solution is 3, heat and reflux in a water bath at 50°C for 12 hours under constant stirring, cool, filter, and wash to the pH of the filtrate The value is neutral, and the acidified multi-walled carbon nanotubes MWCNTs were obtained by vacuum drying at 120°C for 12 hours;

[0037] S2. Dissolve the acidified multi-walled carbon nanotubes prepared in step S1 in water, ultrasonically treat for 2h, add potassium permanganate, the mass ratio of acidified multi-walled carbon nanotubes and potassium permanganate is 1:12, stir for 4h, The stirring speed is 350r / min, react in a hydrothermal synthesis reactor at 120°C for 6h, after the reaction is completed, cool, wash and filter repeatedly until the pH value of the filtrate reaches neutral, and dry at 100°...

Embodiment 2

[0039] A preparation method of a catalyst for catalytic oxidation of formaldehyde at normal temperature, comprising the steps of:

[0040] S1. Dissolve the multi-walled carbon nanotubes in nitric acid solution, the pH of the reaction solution is 3, heat and reflux in a water bath at 50°C for 12 hours under constant stirring, cool, filter, and wash to the pH of the filtrate The value is neutral, and vacuum-dried at 120°C for 12 hours to obtain acidified multi-walled carbon nanotubes;

[0041] S2. Dissolve the acidified multi-walled carbon nanotubes prepared in step S1 in water, ultrasonically treat for 2h, add potassium permanganate, the mass ratio of acidified multi-walled carbon nanotubes and potassium permanganate is 1:3, stir for 4h, The stirring speed is 350r / min, react in a hydrothermal synthesis reactor at 150°C for 6h, after the reaction is completed, cool, wash and filter repeatedly until the pH value of the filtrate is neutral, and then dry at 100°C for 12h to obtain ...

Embodiment 3

[0043] A preparation method of a catalyst for catalytic oxidation of formaldehyde at normal temperature, comprising the steps of:

[0044] S1. Dissolve the multi-walled carbon nanotubes in nitric acid solution, the pH of the reaction solution is 3, heat and reflux in a water bath at 50°C for 12 hours under constant stirring, cool, filter, and wash to the pH of the filtrate The value is neutral, and vacuum-dried at 120°C for 12 hours to obtain acidified multi-walled carbon nanotubes;

[0045] S2. Dissolve the acidified multi-walled carbon nanotubes prepared in step S1 in water, ultrasonically treat for 2h, add potassium permanganate, the mass ratio of acidified multi-walled carbon nanotubes and potassium permanganate is 1:20, stir for 4h, The stirring speed is 350r / min, react in a hydrothermal synthesis reactor at 150°C for 6h, after the reaction is completed, cool, wash and filter repeatedly until the pH value of the filtrate is neutral, and then dry at 100°C for 12h to obtain t...

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Abstract

The invention discloses a catalyst for room-temperature catalytic oxidation of formaldehyde and a preparation method of the catalyst. The preparation method comprises the following steps: carrying outa hydrothermal reaction on acidified multi-walled carbon nanotubes and permanganate according to a certain ratio; uniformly loading manganese dioxide onto the acidified multi-walled carbon nanotubeswith good conductivity so that the manganese dioxide can grow on the surface of the acidified multi-walled carbon nanotubes to form a three-dimensional porous structure. The electron transfer effect of manganese dioxide is improved, and the specific surface area of the catalyst is increased, so that the activity of catalytic oxidation of formaldehyde by manganese dioxide at room temperature is remarkably improved; under the conditions that the temperature is 25 DEG C, the gas hourly space velocity is as high as 120 L / (gh) and the relative humidity is 30-90%, formaldehyde can be completely oxidized, the maximum formaldehyde removal rate can reach 100%, and the concentration of formaldehyde is reduced from 1-6 mg / m<3> to 0.08 mg / m<3> or below. The preparation method provided by the inventionis clean and environment-friendly, does not contain noble metals, and does not need additional light, heat, electricity and other energy devices.

Description

technical field [0001] The invention relates to the technical field of catalytic oxidation of formaldehyde, in particular to a catalyst for catalytic oxidation of formaldehyde at room temperature and a preparation method thereof. Background technique [0002] Formaldehyde, also known as formic aldehyde, is a protoplasmic poison that destroys biological cell proteins. It can cause damage to human skin, respiratory tract, and internal organs, and can cause pulmonary edema, hepatic coma, and kidney failure. It is the main cause of many diseases. Formaldehyde pollution is mainly concentrated indoors. my country's "Hygienic Standards for Formaldehyde in Indoor Air" stipulates that the maximum allowable concentration of formaldehyde in indoor air is 0.08mg / m 3 . However, the concentration of formaldehyde in more than 60% of newly-decorated residential buildings exceeds the standard, which will cause great harm to the health of residents. It is urgent to study the efficient formal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J21/18B01D53/86B01D53/72
CPCB01J23/34B01J21/185B01D53/8668B01D2257/70B01J35/397B01J35/399B01J35/23Y02A50/20
Inventor 江川霞杨宗美麦裕良陈佳志王曦蒋婷婷
Owner GUANGDONG RES INSTITITUTE OF PETROCHEM & FINE CHEM ENG
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