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Preparation method and application of alpha-manganese oxide supported iron-samarium catalyst

A technology of catalyst and manganese oxide, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of high reaction temperature for complete catalytic elimination of benzene series

Active Publication Date: 2015-04-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few studies on the catalytic combustion and elimination of benzene series at home and abroad, and the reaction temperature for complete catalytic elimination of benzene series is relatively high

Method used

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  • Preparation method and application of alpha-manganese oxide supported iron-samarium catalyst
  • Preparation method and application of alpha-manganese oxide supported iron-samarium catalyst
  • Preparation method and application of alpha-manganese oxide supported iron-samarium catalyst

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Effect test

Embodiment 1

[0017] (1) the preparation method of above-mentioned catalyst provided by the present invention, comprises the steps:

[0018] Mix a certain amount of NaOH and citric acid into distilled water to form a buffer solution, wherein NaOH / citric acid is mixed in a molar ratio=1.02 to form a buffer solution, adjust the pH to 3.00, and then add 0.01g of Sm(NO 3 ) 3 .6H 2 O and 0.50gFe(NO 3 ) 3 .9H 2 O was dissolved in the above 40ml citric acid buffer solution. The above buffer solution containing metal salts was added to 24ml with a concentration of 1.0mol / L MnSO 4 solution, mix well. Then 120ml concentration of 0.1mol / L KMnO 4 The solution was dropped into the above mixed solution, in which KMnO 4 / MnSO 4 (molar ratio) = 0.5, stirred for 2 hours, sealed and aged for 12 hours, refluxed at 80°C for 20 hours, rotary steamed for 3 hours until powdery, rinsed with deionized water until neutral, dried at 100°C for 10 hours to obtain a black precursor body, and then ground into p...

Embodiment 2

[0021] (1) the preparation method of above-mentioned catalyst provided by the present invention, comprises the steps:

[0022] Mix a certain amount of NaOH and citric acid into distilled water to form a buffer solution, wherein NaOH / citric acid is mixed in a molar ratio=1.15 to form a buffer solution, adjust the pH between 4.00, and then add 0.03g of Sm(NO 3 )3 .6H 2 O and 1.50g Fe(NO 3 ) 3 .9H 2 O was dissolved in the above 40ml citric acid buffer solution. 0.5g of polyvinyl alcohol PVA (molecular formula (C 2 h 4 O) n , molecular weight 20000) dissolved in 33.3ml concentration is 1.2mol / L MnSO 4 In the solution, add the above buffer solution containing metal salts into this solution, and mix well. Then 140ml concentration of 0.2mol / L KMnO 4 The solution was dropped into the above mixed solution, in which KMnO 4 / MnSO 4 (molar ratio) = 0.7, stirred for 3 hours, sealed and aged for 12 hours, refluxed at 90°C for 22 hours, rotary steamed for 3 hours until powdered, r...

Embodiment 3

[0025] (1) the preparation method of above-mentioned catalyst provided by the present invention, comprises the steps:

[0026] Mix a certain amount of NaOH and citric acid into distilled water to form a buffer solution, wherein NaOH / citric acid is mixed in a molar ratio = 1.35 to form a buffer solution, adjust the pH to about 4.50, and then add 0.04g of Sm(NO 3 ) 3 .6H 2 O and 3.00g Fe(NO 3 ) 3 .9H 2 O was dissolved in the above 40ml citric acid buffer solution. 1.0g of polyvinyl alcohol PVA (molecular formula (C 2 h 4 O) n , molecular weight 20000) dissolved in 37.5ml concentration is 1.5mol / L MnSO 4 In the solution, add the above buffer solution containing metal salts into this solution, and mix well. Then 150ml concentration of 0.30mol / L KMnO 4 The solution was dropped into the above mixed solution, in which KMnO 4 / MnSO 4 (molar ratio) = 0.8, stirred for 4 hours, sealed and aged for 12 hours, refluxed at 110°C for 24 hours, rotary steamed for 4 hours until powd...

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Abstract

The invention discloses a preparation method and an application of an alpha-manganese oxide supported iron-samarium catalyst. Under adjustment of a citric acid buffer solution, manganese sulfate, potassium permanganate, ferric nitrate, samarium nitrate and a dispersing agent are subjected to a refluxing reaction to prepare an alpha-manganese oxide supported iron-samarium sample Fe / Sm-alpha-MnO2 with high specific surface area (100-130 m<2> / g) and high thermal stability (more than 650 DEG C). The catalyst has relatively high eliminating efficiency on benzene and toluene with high space velocity (60000 h<-1>-100000 h<-1>) and low concentration (500 ppm-1000 ppm). At the temperature of 220 DEG C, benzene is completely converted into non-toxic substances CO2 and H2O, and under the temperature of 220 DEG C, the benzene elimination rate in 100 h is kept at more than 90%; at the temperature of 200 DEG C, toluene can be completely converted into non-toxic substances CO2 and H2O, and under the temperature of 200 DGE C, the toluene elimination rate in 100 h is kept at more than 90%. The catalyst has the advantages of cheap raw materials, simple preparation process, high practicability, low temperatures for completely eliminating benzene-series compounds, high efficiency, no secondary pollution and the like.

Description

technical field [0001] The invention relates to an α-manganese oxide supported iron samarium catalyst Fe / Sm-α-MnO for catalytic combustion and elimination of benzene series 2 Preparation, and its use in low-temperature and high-efficiency catalytic combustion to eliminate benzene series. Background technique [0002] Benzene series are one of the main components of VOCs. It usually includes eight compounds such as benzene, toluene, ethylbenzene, and o-xylene, among which benzene series have been listed as priority pollutants in the list of atmospheric toxic pollutants formulated by the US Environmental Protection Agency (USEPA). Benzene series in the air can enter the human body through the respiratory tract, digestive tract and skin, causing various discomforts in the human body, thereby inducing diseases and causing cancer, which has a greater impact on the environment and human health. The treatment technology of benzene series is mainly incineration. There are two ways...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/72
Inventor 叶青傅之丹裴从莹程水源康天放王道
Owner BEIJING UNIV OF TECH
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