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A kind of preparation method and application of α-manganese oxide supported nickel-magnesium catalyst

A technology for supporting nickel and catalyst is applied in the field of preparation of manganese oxide supported nickel-magnesium catalyst Ni/Mg-α-MnO2, and can solve the problem of high reaction temperature for completely catalyzing elimination of benzene series compounds

Inactive Publication Date: 2016-07-13
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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  • A kind of preparation method and application of α-manganese oxide supported nickel-magnesium catalyst
  • A kind of preparation method and application of α-manganese oxide supported nickel-magnesium catalyst
  • A kind of preparation method and application of α-manganese oxide supported nickel-magnesium catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0018] Mix the KAc solution and HAc solution into a buffer solution according to the molar ratio of KAc / HAc = 0.1, adjust the pH to about 3.74, and then add 0.01g of Mg(NO 3 ) 2 ·6H 2 O and 0.29gNi(NO 3 ) 2 ·6H 2 O is dissolved in the above 40ml acetate buffer solution. Add the above buffer solution containing metal salt to 24ml with a concentration of 1.0mol / LMn(Ac) 2 In the solution, mix well. Then the 120ml concentration was 0.1mol / LKMnO 4 The solution is dropped into the above mixed solution, in which KMnO 4 / Mn(Ac) 2 (Molar ratio)=0.5, stir for 2 hours, seal and age for 12 hours, reflux at 80°C for 20 hours, rotary steam for 3 hours until it becomes a powder, rinse with deionized water to neutrality, and dry at 100°C for 10 hours to obtain a black precursor Body, and then ground into powder. Take the above precursor and pure ethanol in a ratio ...

Embodiment 2

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

[0022] Mix the KAc solution and HAc solution into a buffer solution at a molar ratio of KAc / HAc=1.0, adjust the pH to about 4.74, and then add 0.03g of Mg(NO 3 ) 2 ·6H 2 O and 1.50gNi(NO 3 ) 2 ·6H 2 O is dissolved in the above 40ml acetate buffer solution. Put 0.5g of PVP (molecular formula (C 6 H 9 NO) n , Molecular weight 1000) dissolved in 28.5ml, concentration is 1.5mol / LMn(Ac) 2 In solution. Add the above buffer solution containing metal salts to this solution and mix well. Then the concentration of 150ml is 0.2mol / LKMnO 4 The solution is dropped into the above mixed solution, in which KMnO 4 / Mn(Ac) 2 (Molar ratio)=0.7, stirring for 2 hours, sealing and aging for 12 hours, refluxing at 80°C for 20 hours, rotary steaming for 3 hours until it becomes a powder, rinse with deionized water to neutrality, and dry at 100°C for 10 hours to obtain black...

Embodiment 3

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

[0026] The KAc solution and the HAc solution were mixed into a buffer solution at a molar ratio of KAc / HAc=5.0, adjusted to pH 5.4, and then 0.04g of Mg(NO 3 ) 2 ·6H 2 O and 2.50gNi(NO 3 ) 2 ·6H 2 O is dissolved in the above 40ml acetate buffer solution. Put 1.5g of PVP (molecular formula (C 6 H 9 NO) n , Molecular weight 1000) dissolved in 37.5ml, concentration is 1.5mol / LMn(Ac) 2 In solution. Add the above buffer solution containing metal salts to this solution and mix well. Then the concentration of 150ml is 0.3mol / LKMnO 4 The solution is dropped into the above mixed solution, in which KMnO 4 / Mn(Ac) 2 (Molar ratio)=0.8, stirring for 4 hours, sealing and aging for 12 hours, refluxing at 120°C for 26 hours, rotary steaming for 4 hours until it becomes a powder, rinse with deionized water to neutrality, and drying at 140°C for 12 hours to obtain bla...

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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 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 high-efficiency catalytic combustion to eliminate benzene series. Background technique [0002] Benzene is one of the main components of VOCs. It usually includes eight compounds such as benzene, toluene, ethylbenzene, and o-xylene. Among them, benzene series have been listed as priority pollutants in the list of air toxic pollutants established by the US Environmental Protection Agency (USEPA). Benzene compounds 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 have a greater impact on the environment and human health. The treatment technology of benzene series is mainly incineration. There are two ways of incine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/72
Inventor 叶青路恒赵海霞程水源康天放王道
Owner BEIJING UNIV OF TECH
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