Preparation methods and application of alpha-manganese oxide loaded cobalt strontium 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

Inactive Publication Date: 2015-04-15
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 a...

Method used

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  • Preparation methods and application of alpha-manganese oxide loaded cobalt strontium catalyst
  • Preparation methods and application of alpha-manganese oxide loaded cobalt strontium catalyst
  • Preparation methods and application of alpha-manganese oxide loaded cobalt strontium catalyst

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Embodiment 1

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

[0018] KAc with a concentration of 0.1mol / L and 0.1mol / L HAc are mixed into a buffer solution according to the ratio of KAc / HAc molar ratio=0.1, and the pH=3.74 is adjusted, and then 0.01g of SrSO 4 and 0.29g Co(NO 3 ) 2 ·6H 2 O was dissolved in the above 40ml acetic acid buffer solution. Add the above buffer solution containing metal salts to 24ml 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, washed with deionized water until neutral, dried at 100°C for 10 hours, and then ground into powder to obtain a black precursor. Take the above precursor and pure ethanol at a ratio of 8g: 200ml and mix. T...

Embodiment 2

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

[0022] KAc with a concentration of 0.1mol / L and 0.1mol / L HAc are mixed into a buffer solution according to the ratio of KAc / HAc molar ratio = 1.0, and the pH is adjusted to about 4.74, and then 0.02g of SrSO 4 and 1.00g Co(NO 3 ) 2 ·6H 2O was dissolved in the above 40ml acetic acid buffer solution. 0.5g of polyvinyl alcohol PVA (molecular formula (C 2 h 4 O) n , molecular weight 20000) dissolved in 30ml concentration is 1.3mol / LMnSO 4 solution, the above buffer solution containing metal salts was added to 40ml 1.0mol / L MnSO 4 solution, 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 2 hours, sealed and aged for 12 hours, refluxed at 90°C for 23 hours, rotary steamed for 3 hours until powdery, rinsed with deionized water until neutr...

Embodiment 3

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

[0026] KAc with a concentration of 0.1mol / L and 0.1mol / L HAc are mixed into a buffer solution according to the ratio of KAc / HAc molar ratio = 5.0, and the pH is adjusted to about 5.44, and then 0.03g of SrSO 4 and 2.50g Co(NO 3 ) 2 ·6H 2 O was dissolved in the above 40ml acetic acid buffer solution. 1.8g of polyvinyl alcohol PVA (molecular formula (C 2 h 4 O) n , molecular weight 20000) dissolved in 40ml 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 160ml concentration of 0.3mol / L KMnO 4 The solution was dropped into the above mixed solution, in which KMnO 4 / MnSO 4 (molar ratio)=0.8, stirred for 3 hours, sealed and aged for 12 hours, refluxed at 110°C for 26 hours, rotary steamed for 4 hours until powdery, washed with deionized water until neutral, dried...

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Abstract

The invention discloses a preparation method and application of an alpha-manganese oxide loaded cobalt strontium catalyst. The catalyst is prepared as follows: under the regulation of an acetic acid buffer solution, an alpha-manganese oxide loaded cobalt strontium catalyst sample Co / SR-alpha-MnO2 with high specific surface area (100-130 m<2> / g) and high thermal stability (> 650 DEG C) can be prepared by reflux reaction of manganese sulfate, potassium permanganate, cobalt nitrate, strontium sulfate and a dispersion agent. The catalyst has high elimination efficiency to high space velocity (60,000 h<-1>-100,000 <-1>) and low concentration benzene and toluene. The catalyst can completely transform the benzene into non-poisonous materials CO2 and H2O at 230 DEG C, the benzene elimination rate can be kept greater than 90% at 230 DEG C within 100 hours, the toluene can be completely transformed into the non-poisonous materials CO2 and H2O at 200 DEG C, and the toluene elimination rate can be kept greater than 90% at 200 DEG C within 100 hours. The catalyst has the advantage of cheap raw materials, simple catalyst preparation technology, strong practicability, low benzene series complete elimination temperature, high efficiency, no secondary pollution and the like.

Description

technical field [0001] The invention relates to a kind of manganese oxide (α-MnO) used for catalytic combustion to eliminate benzene series 2 ) loaded cobalt strontium Co / Sr-α-MnO 2 The preparation of the catalyst, 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 inci...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/90B01D53/72
Inventor 叶青赵海霞路恒程水源康天放王道
Owner BEIJING UNIV OF TECH
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