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Supported copper-manganese composite oxide catalyst capable of removing formaldehyde at room temperature and preparation method

A technology of composite oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the limitation of the promotion and application of formaldehyde removal, high price, etc. problem, to achieve the effect of good economy and practicability, low production cost and large processing capacity

Inactive Publication Date: 2014-02-26
TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the scarcity and high price of precious metal resources, the promotion and application of room temperature catalytic oxidation to remove formaldehyde are limited.

Method used

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  • Supported copper-manganese composite oxide catalyst capable of removing formaldehyde at room temperature and preparation method
  • Supported copper-manganese composite oxide catalyst capable of removing formaldehyde at room temperature and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 1.72gCu(NO 3 ) 2 ·3H 2 O and 10.32g of 50% manganese nitrate aqueous solution were added to distilled water to form a 10% mixed solution, and then 18g of powdered TiO 2 , magnetically stirred at 50°C for 2h, dried at 120°C for 6h, and calcined in a muffle furnace at 1000°C for 3h to obtain the catalyst. In the prepared catalyst, the copper-manganese component has a loading capacity of 10% based on the weight of metal elements, and the molar ratio of Cu and Mn is 1:4.

[0020] Catalyst performance tests are in the attached figure 1 The static catalytic oxidation of formaldehyde shown in the experimental device was carried out. Place 0.5 g of catalyst 1 and sample bottle 2 with a volume of 1 mL at the bottom of a conical flask 5 with a volume of 1 L. At the same time, add 5 μL of 37% formalin solution into the sample bottle 2 and use a silica gel equipped with a balance bag 3 to quickly seal the Erlenmeyer flask 5 and place it in a constant temperature water ba...

Embodiment 2

[0022] Weigh 5.62gCu(NO 3 ) 2 ·3H 2 O and 16.86g of 50% manganese nitrate aqueous solution were added to distilled water to form a 15% mixed solution, and then 16g of powdered TiO 2 , magnetically stirred at 40°C for 4h, dried at 100°C for 8h, and calcined in a muffle furnace at 700°C for 5h to obtain the catalyst. In the prepared catalyst, the copper-manganese component has a loading capacity of 20% in terms of metal element weight, and the molar ratio of Cu and Mn is 1:2.

[0023] Catalyst performance tests are in the attached figure 2The continuous-flow fixed-bed micro-catalytic reaction experimental device was carried out. Dilute 5g of catalyst with quartz sand and fill it in a stainless steel fixed bed 12 (pipe diameter 20mm, length 550mm), compressed air from the air storage tank 7 is controlled by a pressure reducing valve 8 and a flow meter 9 into the conical tank containing the formaldehyde solution. The bottle 5 carries the formaldehyde gas through the buffer b...

Embodiment 3

[0025] Weigh 24.6gCu(NO 3 ) 2 ·3H 2 O and 37.02g of 50% manganese nitrate aqueous solution were added to distilled water to form a 20% mixed solution, and then 28g of powdered TiO 2 , magnetically stirred at 30°C for 6h, dried at 80°C for 10h, and calcined in a muffle furnace at 400°C for 8h to obtain the catalyst. In the prepared catalyst, the copper-manganese component has a loading capacity of 30% based on the weight of metal elements, and the molar ratio of Cu and Mn is 1:1.

[0026] The performance test of the catalyst is the same as in Example 2, but the formaldehyde concentration at the inlet is 100ppm, and the reaction gas flow rate is 400mL min -1 , the reaction temperature is 20°C, and the formaldehyde removal rate is 90.3% calculated by the difference of formaldehyde gas concentration before and after.

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Abstract

The invention discloses a supported copper-manganese composite oxide catalyst capable of removing formaldehyde at room temperature and a preparation method. The supported copper-manganese composite oxide catalyst is capable of completely oxidizing formaldehyde gas in the air into carbon dioxide and water under the conditions of room temperature and normal atmospheric humidity; the catalyst uses Cu and Mn as active components and employs TiO2 or active alumina as a carrier, the content of Cu and Mn accounts for 10 to 30% of the total mass of the catalyst, and a mol ratio of Cu to Mn is 1 1 to 1 4; evaluation of purification performance of the catalyst on formaldehyde is carried out in a self-made static catalytic oxidation formaldehyde reaction experimental apparatus and a minisized catalytic reaction experimental apparatus. According to the invention, the catalyst can highly efficiently, stably and thoroughly remove formaldehyde in the air in the actual environment of normal temperature and normal atmospheric humidity; the preparation method for the catalyst is simple and has low cost, input of any external energy is not needed in a catalytic reaction, and the catalyst is applicable to removal of formaldehyde pollution in closed and semiclosed space like an artificial board production workshop, a room and a building material and furniture market.

Description

technical field [0001] The invention relates to a supported copper-manganese composite oxide catalyst and a preparation method for completely oxidizing formaldehyde gas in the air into harmless carbon dioxide and water under room temperature and normal humidity conditions, and belongs to the fields of catalytic materials, environmental catalysis and environmental protection. It is characterized in that the catalyst uses Cu and Mn as active components, and uses TiO 2 Or activated alumina as a carrier. Background technique [0002] With the accelerated development of urbanization in our country, the indoor air pollution caused by residential decoration is becoming more and more serious, which has become an important issue affecting the health of the population and social harmony. Formaldehyde is one of the most typical and serious pollutants in the indoor environment. It has high toxicity and ranks second on the priority list of toxic chemicals in my country. It has been iden...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/72
Inventor 张涛宁晓宇黄丽丽翟友存韩萌耿静曹阳张君
Owner TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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