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Catalyst for adsorbing formaldehyde as indoor pollutant in high humility at room temperature

A high-humidity, adsorption chamber technology, applied in the fields of environmental pollution and methods, can solve problems such as the decline of formaldehyde adsorption capacity, and achieve the effects of strong formaldehyde adsorption capacity, overcoming the decline in formaldehyde adsorption capacity, and simple preparation process.

Inactive Publication Date: 2010-09-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a high-efficiency catalyst for adsorbing formaldehyde in a room temperature and high humidity environment, which is used for indoor air purification and solves the problem that the formaldehyde adsorption capacity of ordinary catalysts decreases due to the competitive adsorption of water in a room temperature and high humidity environment

Method used

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  • Catalyst for adsorbing formaldehyde as indoor pollutant in high humility at room temperature
  • Catalyst for adsorbing formaldehyde as indoor pollutant in high humility at room temperature

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] Example 1: Cerium-based composite oxide Cu-MnO x -CeO 2

[0013] (1) Press Cu(NO 3 ) 2 ·3H 2 O: KMnO 4 : Mn(NO 3 ) 2 : Ce(NO 3 ) 3 ·6H 2 O=1:2:2:5 molar ratio calculation, first weigh 4.342g of Ce(NO 3 ) 3 ·6H 2 O and 0.632 g of KMnO 4 , add 100ml of deionized water to make a solution.

[0014] (2) Under magnetic stirring, add 50ml, 0.12mol L -1 MnNO 3 solution and 25ml, 0.08mol·L -1 Cu(NO 3 ) 2 solution.

[0015] (3) Use 2mol·L -1 The pH of the above solution was adjusted to 10.5 with KOH, and stirred at 50°C for 2h.

[0016] (4) After the stirring was stopped, the solution (3) was aged for 10 hours, then filtered, washed with deionized water and absolute ethanol, and then the obtained precipitate was dried in an oven at 110° C. for 12 hours.

[0017] (5) The oxide was calcined at 500°C for 6h to obtain ultrafine particle cerium-based composite oxide Cu-MnO x -CeO 2 .

example 2

[0018] Example 2: Cerium-based composite oxide Cu-TiO x -CeO 2

[0019] (1) Press Cu(NO 3 ) 2 ·3H 2 O:Ti(OC 4 h 9 ) 4 : Ce(NO 3 ) 3 ·6H 2 O=1:4:5 molar ratio calculation, first weigh 4.342g of Ce(NO 3 ) 3 ·6H 2 O and 2.723g of Ti(OC 4 h 9 ) 4 , Add 100ml of ethanol to make a solution.

[0020] (2) Under magnetic stirring, add 25ml, 0.08mol L -1 Cu(NO 3 ) 2 solution.

[0021] (3) Use 2mol·L -1 The pH of the above solution was adjusted to 10.5 with KOH, and stirred at 50°C for 2h.

[0022] (4) After the stirring was stopped, the solution (3) was aged for 10 hours, then filtered, washed with deionized water and absolute ethanol, and then the obtained precipitate was dried in an oven at 110° C. for 12 hours.

[0023] (5) The oxide was calcined at 500°C for 6h to obtain ultrafine particle cerium-based composite oxide Cu-TiO x -CeO 2 .

example 3

[0024] Example 3: Cerium-based composite oxide Cu-ZnO x -CeO 2

[0025] (1) Press Cu(NO 3 ) 2 ·3H 2 O:Zn(NO 3 ) 2 ·6H 2 O: Ce(NO 3 ) 3 ·6H 2 O=1:4:5 molar ratio calculation, first weigh 4.342g of Ce(NO 3 ) 3 ·6H 2 O and 2.380g of Zn(NO 3 ) 2 ·6H 2 O, add 100ml of deionized water to make a solution.

[0026] (2) Under magnetic stirring, add 25ml, 0.08mol L -1 Cu(NO 3 ) 2 solution.

[0027] (3) Use 2mol·L -1 The pH of the above solution was adjusted to 10.5 with KOH, and stirred at 50°C for 2h.

[0028] (4) After the stirring was stopped, the solution (3) was aged for 10 hours, then filtered, washed with deionized water and absolute ethanol, and then the obtained precipitate was dried in an oven at 110° C. for 12 hours.

[0029] (5) Calcinate the oxide at 500°C for 6h to obtain ultrafine particles of cerium-based composite oxide Cu-ZnO x -CeO 2 .

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Abstract

The invention relates to a catalyst for adsorbing formaldehyde as an indoor pollutant in high humility at room temperature, belonging to the technical field of pollution control. On the basis of cerium oxide, by adding different metal oxides and transition metals, a ceria-based complex oxide solid solution with different proportions and components is prepared by using a coprecipitation method; the metal oxide is one of titanium dioxide, manganese oxide, ferric oxide, cobalt oxide and zinc oxide or a mixture of more than one kind of the oxides; and the transition metal is one or a mixture of more than one of copper, silver and gold. The catalyst has simple preparation process and stronger formaldehyde adsorption capacity in high humility at room temperature, solves the problem of formaldehyde adsorption capacity reduction of active carbon, and the like under the high-humility environment, and maintains activity for a relatively long time.

Description

technical field [0001] The invention relates to the field of environmental pollution and technology, and relates to a composite oxide catalyst based on cerium oxide, in particular to a catalyst capable of absorbing and storing formaldehyde in a room temperature and high humidity environment. technical background [0002] Most people spend 80%-90% of their time indoors, and children, the elderly, the sick, and the disabled spend more time. Indoor air quality greatly affects people's quality of life, health and work efficiency. Formaldehyde is one of the most typical and serious pollutants in the indoor environment, and has been identified as carcinogenic and teratogenic substances by the World Health Organization. my country's national standard stipulates that the maximum allowable concentration of formaldehyde in indoor air is 0.08mg / m 3 , about 0.06ppm at room temperature. However, according to surveys, the content of formaldehyde in the air in half of the homes and offic...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/83B01J23/68B01J20/06B01D53/72B01D53/86
Inventor 石川陈冰冰朱爱民徐勇
Owner DALIAN UNIV OF TECH
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