Preparation method and application of alpha-manganese oxide loaded nickel-magnesium catalyst

Abstract

The invention discloses a preparation method and an application of an alpha-manganese oxide loaded nickel-magnesium catalyst. The catalyst is used in low-temperature high-efficiency catalysis of combustion for removing benzene-series substances. Under the adjustment of an acetic acid buffering solution, manganese sulfate, potassium permanganate, nickel nitrate, magnesium nitrate and a dispersing agent are subjected to a reflux reaction, such that an alpha-manganese oxide loaded nickel-magnesium Ni / Mg-alpha-MnO2 sample with high specific surface area (120-130m<2> / g) and high thermal stability (higher than 650 DEG C) is prepared. The catalyst has high removal rate towards high-space-velocity (60,000h<-1>-100,000h<-1>) and low-concentration (500ppm-1000ppm) benzene and toluene. Under a temperature of 240 DEG C, benzene can be completely converted into non-toxic substances CO2 and H2O. Under the temperature, a benzene removal rate can be maintained higher than 90% within 100h. Under a temperature of 210 DEG C, toluene can be completely converted into non-toxic substances CO2 and H2O. Under the temperature, a toluene removal rate can be maintained higher than 90% within 100h. The catalyst has the advantages of cheap raw materials, simple preparation process, and high practicality. With the catalyst, benzene-series substances can be completely eliminated with low temperature, high efficiency, and no secondary pollution.

Description

technical field

[0001] The invention relates to a kind of manganese oxide (α-MnO) used for catalytic combustion to eliminate benzene series 2 ) supported nickel magnesium catalyst Ni / Mg-α-MnO 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...

Examples

Embodiment 1

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

[0018] The KAc solution and the HAc solution were mixed into a buffer solution according to the ratio of KAc / HAc molar ratio=0.1, and the pH was adjusted at about 3.74, and then 0.01 g of Mg(NO 3 ) 2 ·6H 2 O and 0.29g Ni(NO 3 ) 2 ·6H 2 O was dissolved in the above 40ml acetic acid buffer solution. The above buffer solution containing metal salts was added to 24ml with a concentration of 1.0mol / L Mn(Ac) 2 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 / Mn(Ac) 2 (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 it became powdery, washed with deionized water until neutral, dried at 100°C for 10 hours to obtain a black precursor body, and then ground into powder. Take the above pr...

Embodiment 2

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

[0022] The KAc solution and the HAc solution were mixed into a buffer solution according to the ratio of KAc / HAc molar ratio=1.0, and the pH was adjusted at about 4.74, and then 0.03g of Mg(NO 3 ) 2 ·6H2 O and 1.50g Ni(NO 3 ) 2 ·6H 2 O was dissolved in the above 40ml acetic acid buffer solution. With 0.5g of PVP (molecular formula (C 6 h 9 NO) n , molecular weight 1000) dissolved in 28.5ml concentration is 1.5mol / L Mn(Ac) 2 in solution. Add the above buffer solution containing metal salts to this solution and mix well. Then 150ml concentration of 0.2mol / L KMnO 4 The solution was dropped into the above mixed solution, in which KMnO 4 / Mn(Ac) 2 (molar ratio) = 0.7, stirred for 2 hours, sealed and aged for 12 hours, refluxed at 80°C for 20 hours, rotary steamed for 3 hours until it became powdery, washed with deionized water until neutral, dried at 1...

Embodiment 3

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

[0026] The KAc solution and the HAc solution are mixed into a buffer solution according to the ratio of KAc / HAc molar ratio=5.0, the pH is adjusted at 5.4, and then 0.04g of Mg(NO 3 ) 2 ·6H 2 O and 2.50g Ni(NO 3 ) 2 ·6H 2 O was dissolved in the above 40ml acetic acid buffer solution. With 1.5g of PVP (molecular formula (C 6 h 9 NO) n , molecular weight 1000) dissolved in 37.5ml concentration is 1.5mol / L Mn(Ac) 2 in solution. Add the above buffer solution containing metal salts to this solution and mix well. Then 150ml concentration of 0.3mol / L KMnO 4 The solution was dropped into the above mixed solution, in which KMnO 4 / Mn(Ac) 2 (molar ratio) = 0.8, stirred for 4 hours, sealed and aged for 12 hours, refluxed at 120°C for 26 hours, rotary steamed for 4 hours until it became powder, washed with deionized water until neutral, dried at 140°C for 12...

technical field

[0001] The invention relates to a kind of manganese oxide (α-MnO) used for catalytic combustion to eliminate benzene series 2 ) supported nickel magnesium catalyst Ni / Mg-α-MnO 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...

Examples

Embodiment 1

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

[0018] The KAc solution and the HAc solution were mixed into a buffer solution according to the ratio of KAc / HAc molar ratio=0.1, and the pH was adjusted at about 3.74, and then 0.01 g of Mg(NO 3 ) 2 ·6H 2 O and 0.29g Ni(NO 3 ) 2 ·6H 2 O was dissolved in the above 40ml acetic acid buffer solution. The above buffer solution containing metal salts was added to 24ml with a concentration of 1.0mol / L Mn(Ac) 2 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 / Mn(Ac) 2 (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 it became powdery, washed with deionized water until neutral, dried at 100°C for 10 hours to obtain a black precursor body, and then ground into powder. Take the above pr...

Embodiment 2

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

[0022] The KAc solution and the HAc solution were mixed into a buffer solution according to the ratio of KAc / HAc molar ratio=1.0, and the pH was adjusted at about 4.74, and then 0.03g of Mg(NO 3 ) 2 ·6H2 O and 1.50g Ni(NO 3 ) 2 ·6H 2 O was dissolved in the above 40ml acetic acid buffer solution. With 0.5g of PVP (molecular formula (C 6 h 9 NO) n , molecular weight 1000) dissolved in 28.5ml concentration is 1.5mol / L Mn(Ac) 2 in solution. Add the above buffer solution containing metal salts to this solution and mix well. Then 150ml concentration of 0.2mol / L KMnO 4 The solution was dropped into the above mixed solution, in which KMnO 4 / Mn(Ac) 2 (molar ratio) = 0.7, stirred for 2 hours, sealed and aged for 12 hours, refluxed at 80°C for 20 hours, rotary steamed for 3 hours until it became powdery, washed with deionized water until neutral, dried at 1...

Embodiment 3

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

[0026] The KAc solution and the HAc solution are mixed into a buffer solution according to the ratio of KAc / HAc molar ratio=5.0, the pH is adjusted at 5.4, and then 0.04g of Mg(NO 3 ) 2 ·6H 2 O and 2.50g Ni(NO 3 ) 2 ·6H 2 O was dissolved in the above 40ml acetic acid buffer solution. With 1.5g of PVP (molecular formula (C 6 h 9 NO) n , molecular weight 1000) dissolved in 37.5ml concentration is 1.5mol / L Mn(Ac) 2 in solution. Add the above buffer solution containing metal salts to this solution and mix well. Then 150ml concentration of 0.3mol / L KMnO 4 The solution was dropped into the above mixed solution, in which KMnO 4 / Mn(Ac) 2 (molar ratio) = 0.8, stirred for 4 hours, sealed and aged for 12 hours, refluxed at 120°C for 26 hours, rotary steamed for 4 hours until it became powder, washed with deionized water until neutral, dried at 140°C for 12...

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