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Preparation method and application of Au and Ag loaded mesoporous beta-MnO2 catalyst

A catalyst and mesoporous technology, applied in the application field of low-temperature catalytic combustion to eliminate formaldehyde, to achieve the effects of mild reaction conditions, low energy consumption, and simple preparation process

Inactive Publication Date: 2011-12-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are few studies on the elimination of formaldehyde by catalytic combustion at home and abroad. According to all the reported literatures, although they also have good activity, most of them use noble metal Pd and Pt supported catalysts, while Au and Ag supported catalysts are used for catalytic combustion treatment. There are very few reports on formaldehyde, using mesoporous β-MnO with a three-dimensional ordered hexagonal structure with high specific surface area 2 It has not been reported as a carrier. In this study, Au and Ag were used to support mesoporous β-MnO 2 The catalyst obtains very good catalytic elimination activity and high stability

Method used

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  • Preparation method and application of Au and Ag loaded mesoporous beta-MnO2 catalyst
  • Preparation method and application of Au and Ag loaded mesoporous beta-MnO2 catalyst
  • Preparation method and application of Au and Ag loaded mesoporous beta-MnO2 catalyst

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Mn(NO 3 ) 2 4H 2 O was dissolved in deionized water to form a 7mol / L solution. Add KIT-6 into n-hexane solution to form a 20g / L solution, and stir well at room temperature for 2 hours. Under the condition of stirring, slowly add the above manganese nitrate solution into the KIT-6 n-hexane solution, wherein the mass ratio of Mn to KIT-6 is 1.0:1, then stir the mixed solution system at room temperature for 10 hours, filter with suction , and dried at 25°C to obtain a black product, which was placed in a tube furnace, purged with an air flow of 200mL / min, slowly raised to 300°C at 1°C / min, and kept at this temperature for 2 hours to obtain a black Powder, wash the black powder with 0.001mol / L sodium hydroxide solution at 50°C to remove the KIT-6 template, wash with deionized water to remove residual impurities, and finally, dry the product at 120°C for 20 hours to obtain β -MnO2 .

[0026] Dissolve chloroauric acid in deionized water to prepare a 0.01mol / L chloroa...

Embodiment 2

[0031] (1) Mn(NO 3 ) 2 4H 2 O was dissolved in deionized water to form a 9mol / L solution. Add KIT-6 into n-hexane solution to form a 30g / L solution, and stir thoroughly at room temperature for 4 hours. Under the condition of stirring, slowly add the above manganese nitrate solution in the n-hexane solution of KIT-6, wherein the mass ratio of Mn to KIT-6 is 3.0:1, then stir the mixed solution system at room temperature for 14 hours, pump Filter and dry at 40°C to obtain a black product, which is placed in a tube furnace, purged with an air flow rate of 300mL / min, slowly heated to 400°C at 3°C / min, and calcined at this temperature for 4 hours to obtain Black powder, then the black powder was washed with 0.009mol / L sodium hydroxide solution at 70°C to remove the KIT-6 template, washed with deionized water to remove residual impurities, and finally, the product was dried at 120°C for 20 hours, Get β-MnO 2 .

[0032] Dissolve chloroauric acid in deionized water to prepare a c...

Embodiment 3

[0037] (1) Mn(NO 3 ) 2 4H 2 O was dissolved in deionized water to form a 7mol / L solution. Add KIT-6 into n-hexane solution to form a 20g / L solution, and stir well at room temperature for 2 hours. Under the condition of stirring, slowly add the above manganese nitrate solution into the KIT-6 n-hexane solution, wherein the mass ratio of Mn to KIT-6 is 1.0:1, then stir the mixed solution system at room temperature for 10 hours, filter with suction , and dried at 25°C to obtain a black product, which was placed in a tube furnace, purged with an air flow of 200mL / min, slowly raised to 300°C at 1°C / min, and kept at this temperature for 2 hours to obtain a black Powder, wash the black powder with 0.001mol / L sodium hydroxide solution at 50°C to remove the KIT-6 template, wash with deionized water to remove residual impurities, and finally, dry the product at 120°C for 20 hours to obtain β -MnO 2 .

[0038] Dissolve silver nitrate in deionized water to make a 0.05mol / L silver nit...

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Abstract

The invention provides a preparation method and application of an Au and Ag loaded mesoporous beta-MnO2 catalyst. The preparation method comprises the steps of preparing beta-MnO2 with a three-dimensional ordered six-square hole structure, regular hole distribution (the most probable distribution ranges from 3.7 to 3.8nm) and high specific surface area (100-180m<2> / g) by the hard template method of dipping KIT-6 with manganous nitrate, drying, roasting, dissolving, washing and drying; and then loading Au or Ag on the beta-MnO2 to prepare the catalyst. The catalyst is suitable for catalytic combustion removal of formaldehyde with high airspeed (60000h<-1> to 100000h<-1>) and low concentricity (500ppm-1000ppm), can completely convert the formaldehyde into non-poisonous materials of CO2 and H2O at 140 degrees centigrade to 150 degrees centigrade and keeps the elimination ratio of 100% within 100h. The prepared catalyst has the advantages of low-cost materials, less load of noble metals, simple preparation process, strong practicability, complete elimination of formaldehyde, low temperature, high efficiency, no secondary pollution, and the like.

Description

technical field [0001] The invention relates to a three-dimensional ordered hexagonal mesoporous β-MnO loaded with Au and Ag for catalytic combustion to eliminate formaldehyde 2 Catalyst and its preparation method and application in low-temperature catalytic combustion to eliminate formaldehyde. Background technique [0002] Volatile organic compounds (Volatile organic compounds (VOCs)) are a type of gaseous pollutants, which refer to organic compounds with a boiling point lower than 260°C or a vapor pressure lower than 70Pa at normal temperature and pressure. VOCs are a class of organic pollutants that are ubiquitous indoors and outdoors and have a complex composition. They mainly come from automobile exhaust emissions, industrial production and energy use processes. The pollution of VOCs has been listed as one of the five major factors that endanger human health internationally. Therefore, the control and treatment of VOCs in the atmosphere has become one of the environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68B01D53/86B01D53/72
Inventor 叶青赵建生霍飞飞程水源康天放
Owner BEIJING UNIV OF TECH
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