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Preparation method and application of mesoporous Co3O4/ Beta-MnO2 or NiO/ Beta-MnO2 catalysts

A catalyst and mesoporous technology, applied in the field of transition metal composite catalysts and their preparation, to achieve the effects of low energy consumption, mild reaction conditions and economical benefits

Inactive Publication Date: 2010-12-15
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 researches 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 or Pt supported catalysts, and use transition metal catalysts to catalytic combustion process formaldehyde. There are very few reports, and there is no report on the use of three-dimensional hexagonal ordered mesoporous oxide materials with high specific surface area. In this study, three-dimensional hexagonal ordered mesoporous Co 3 o 4 / β-MnO 2 and NiO / 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 mesoporous Co3O4/ Beta-MnO2 or NiO/ Beta-MnO2 catalysts
  • Preparation method and application of mesoporous Co3O4/ Beta-MnO2 or NiO/ Beta-MnO2 catalysts
  • Preparation method and application of mesoporous Co3O4/ Beta-MnO2 or NiO/ Beta-MnO2 catalysts

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Mn(NO 3 ) 2 4H 2 O and Co(NO 3 ) 2 ·6H 2O was dissolved in deionized water to form a 7 mol / L mixed solution, wherein the molar ratio of Mn to Co was 15:1. Add KIT-6 into n-hexane solution to form a 20g / L solution, and stir well at room temperature for 2 hours. In the case of stirring, add the above mixed solution of manganese nitrate and cobalt nitrate into the KIT-6 n-hexane solution, wherein the mass ratio of Mn to KIT-6 is 1.0:1, and then stir the mixed solution system at room temperature for 10 hours , suction filtration, and drying at 25°C to obtain a black product, which was placed in a tube furnace, purged with an air flow of 200mL / min, raised to 300°C at a rate of 1°C / min, and kept at this temperature for calcination for 2 hours. A black powder was obtained, which was washed with 0.001mol / L sodium hydroxide solution at 50°C to remove the KIT-6 template, washed with deionized water to remove residual impurities, and finally, the product was dried at 120...

Embodiment 2

[0029] (1) Mn(NO 3 ) 2 4H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to form a 9 mol / L mixed solution, in which the molar ratio of Mn to Co was 35:1. Add KIT-6 into n-hexane solution to form a 30g / L solution, and stir thoroughly at room temperature for 4 hours. In the case of stirring, add the above mixed solution of manganese nitrate and nickel nitrate into the n-hexane solution of KIT-6, wherein the mass ratio of Mn to KIT-6 is 3.0:1, and then stir the mixed solution system at room temperature After 14 hours, filter with suction 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, heated to 400°C at 3°C / min, and calcined at this temperature for 4 hours. hours, a black powder was obtained, and 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 produc...

Embodiment 3

[0034] (1) Mn(NO 3 ) 2 4H 2 O and Ni(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to form a 7 mol / L mixed solution, wherein the molar ratio of Mn to Ni was 16:1. Add KIT-6 into n-hexane solution to form a 20g / L solution, and stir well at room temperature for 2 hours. In the case of stirring, the above mixed solution of manganese nitrate and nickel nitrate was added to the KIT-6 n-hexane solution, wherein the mass ratio of Mn to KIT-6 was 1.0:1, and then the mixed solution system was stirred at room temperature for 10 hours, suction filtration, and drying at 25°C to obtain a black product, which was placed in a tube furnace, purged with an air flow of 200mL / min, raised to 300°C at a rate of 1°C / min, and kept at this temperature for calcination 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...

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Abstract

This invention provides a preparation method and application of mesoporous Co3O4 / Beta-MnO2 or NiO / Beta-MnO2 catalysts. The mesoporous Co3O4 / Beta-MnO2 and NiO / Beta-MnO2 catalysts having an ordered 3D-hexagonal structure, a specified aperture of 3.7-3.8 nm and a high specific surface area of 100-200 sq.m / g are prepared by a hard template method, which comprises the following steps of: immersing KIT-6 into mixed solution of manganous nitrate and cobalt nitrate or mixed solution of manganous nitrate and nickel nitrate, drying, roasting, dissolving, washing and drying. The catalysts of the invention are applicable to the elimination of formaldehyde with a high air velocity of 60,000 to 100,000 h(-1) and at the low concentration of 500 to 1,000 ppm by catalytic combustion. At the temperature of 130 to 140 DEG C, the formaldehyde can be converted into nonpoisonous CO2 and H2O with a conversion rate of 100 percent, and 100 percent of elimination rate of formaldehyde can be kept within 100 hours.

Description

technical field [0001] The invention relates to a transition metal composite catalyst with a three-dimensional hexagonal ordered mesoporous structure and a preparation method thereof. And it is used for low-temperature catalytic combustion to eliminate low-concentration formaldehyde. Background technique [0002] Volatile organic compounds (Volatile organic compounds (VOCs)) are a type of gaseous pollutants, organic compounds with a boiling point lower than 260°C or a vapor pressure lower than 70Pa at normal temperature and pressure. Most of VOCs are poisonous, can induce disease and even cause cancer, and its pollution has been listed as one of the five major factors that endanger human health internationally. Formaldehyde is a kind of VOCs gas. Formaldehyde is a colorless and irritating gas. It mainly comes from outdoor industrial waste gas, automobile exhaust, photochemical smog, etc.; in the living room, it mainly comes from building materials, interior decoration mater...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J35/10B01D53/72B01D53/86
Inventor 叶青霍飞飞赵建生程水源康天放
Owner BEIJING UNIV OF TECH
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