Catalyst to catalytically degrade formaldehyde at normal temperature and preparation method and application thereof

A catalytic degradation and catalyst technology, which is applied in the field of catalyst materials for purifying formaldehyde, can solve the problems of unstable activity, large specific surface area, and high preparation cost, and achieve good removal effect, simple process conditions, and optimized structure

Inactive Publication Date: 2019-10-11
THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high preparation cost, large specific surface area, unstable activity and inability to effectively remove formaldehyde at ppb level in existing formaldehyde catalysts, the present invention provides a catalyst for catalytically degrading formaldehyde at room temperature

Method used

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  • Catalyst to catalytically degrade formaldehyde at normal temperature and preparation method and application thereof
  • Catalyst to catalytically degrade formaldehyde at normal temperature and preparation method and application thereof
  • Catalyst to catalytically degrade formaldehyde at normal temperature and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A preparation method of a catalyst for catalyzing formaldehyde at normal temperature, comprising the following steps:

[0071] (1) Take 2.864g 50% Mn(NO 3 ) 2 solution, 9.114g Ce(NO 3 ) 3 ·6H 2 O, dissolved in 100mL water, while 4.582g KMnO 4 dissolved therein to obtain a reaction solution, which was placed on a magnetic stirrer and stirred for 2 h.

[0072] (2) Use 1mol / L NH 3 ·H 2 O adjust the pH of the solution obtained in step (1) to about 8.0, then move the reaction solution into a three-necked flask, and start the reflux condensation reaction in an oil bath at 60°C; % TiO 2 sol, the TiO 2 Sol, TiO 2 The concentration is 0.020g / mL, stir evenly, close the bottle mouth, reflux condensation reaction lasts for 4h; centrifuge the precipitate and wash until the supernatant is clear, take the centrifuged precipitate and fully dry it at 70°C, transfer it to the muffle furnace Calcined at 350°C for 5h to obtain TiO 2 load MnO x -CeO 2 (abbreviation: TO-MCO) ca...

Embodiment 2

[0079] A preparation method of a catalyst for catalyzing formaldehyde at normal temperature, comprising the following steps:

[0080] (1) Take 6.263g of 50% Mn(NO 3 ) 2 solution, 21.711g Ce(NO 3 ) 3 ·6H 2 O, dissolved in 500mL water, while 10.667g KMnO 4 dissolved therein to obtain a reaction solution, which was placed on a magnetic stirrer and stirred for 2 h.

[0081] (2) Use 1mol / L NH 3 ·H 2 O adjust the pH of the solution obtained in step (1) to about 8.0, then move the reaction solution into a three-necked flask, and start the reflux condensation reaction in an oil bath at 60°C; %TiO 2 sol, the TiO 2 Sol, TiO 2 The concentration is 0.020g / mL, stir evenly, close the bottle mouth, reflux condensation reaction lasts for 4h; centrifuge the precipitate and wash until the supernatant is clear, take the centrifuged precipitate and fully dry it at 70°C, transfer it to the muffle furnace Calcined at 360°C for 5h to obtain TiO 2 load MnO x -CeO 2 (abbreviation: TO-MCO...

Embodiment 3

[0083] A preparation method of a catalyst for catalyzing formaldehyde at normal temperature, comprising the following steps:

[0084] (1) Take 6.800g of 50% Mn(NO 3 ) 2 solution, 21.711g Ce(NO 3 ) 3 ·6H 2 O, dissolved in 600mL water, while 10.904g KMnO 4 dissolved therein to obtain a reaction solution, which was placed on a magnetic stirrer and stirred for 2 h.

[0085] (2) Use 1mol / L NH 3 ·H 2 O adjust the pH of the solution obtained in step (1) to about 8.0, then move the reaction solution into a three-necked flask, and start the reflux condensation reaction in an oil bath at 50°C; %TiO 2 sol, the TiO 2 Sol, TiO 2 The concentration is 0.020g / mL, stir evenly, close the bottle mouth, reflux condensation reaction lasts for 4h; centrifuge the precipitate and wash until the supernatant is clear, take the centrifuged precipitate and fully dry it at 70°C, transfer it to the muffle furnace Calcined at 320°C for 5h to obtain TiO 2 load MnO x -CeO 2 (abbreviation: TO-MCO...

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Abstract

The invention relates to the technical field of catalyst materials to purify formaldehyde and particularly discloses a catalyst to catalytically degrade formaldehyde at a normal temperature and a preparation method thereof. The catalyst herein is a composite which employs MnOx-CeO2 as a carrier; TiO2 is carried on the surface of the carrier; the composite is spherical nano crystal. The catalyst ofthe invention is capable of efficiently and quickly degrading formaldehyde stably attracted to the surface of the catalyst, and can degrade formaldehyde having the low concentration of 500 ppb and below at a degrading rate of 60% and above within 3 hours.

Description

technical field [0001] The invention relates to the technical field of catalyst materials for purifying formaldehyde, in particular to a catalyst for catalytically degrading formaldehyde at room temperature, a preparation method and application thereof. Background technique [0002] Formaldehyde (chemical formula HCHO) is one of the most important indoor air pollutants. Because of its strong water solubility, volatility and irritation, it can quickly penetrate into the respiratory system and digestive system, seriously inhibiting and invading the human body. The normal growth function of white blood cells and red blood cells has caused great harm to people's health. According to the national standard "Indoor Air Quality Standard" (GB / T 18883-2002) of the People's Republic of China, the maximum allowable concentration of formaldehyde in indoor air is 100 μg / cm 3 (82ppb). However, after investigation, more than half of the homes, offices and shopping malls in most cities hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/08B01J35/02B01D53/86B01D53/72
CPCB01D53/8668B01J23/002B01J23/34B01J35/023B01J35/08B01J2523/00B01J2523/3712B01J2523/47B01J2523/72
Inventor 李海玮李顺诚黄宇何咏基曹军骥
Owner THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST
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