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OMS-2 catalyst used in elimination of benzene series at low temperature and preparation and application

A technology of OMS-2 and low-temperature catalysis, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of high reaction temperature for complete catalytic elimination of benzene series

Inactive Publication Date: 2010-12-29
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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  • OMS-2 catalyst used in elimination of benzene series at low temperature and preparation and application
  • OMS-2 catalyst used in elimination of benzene series at low temperature and preparation and application
  • OMS-2 catalyst used in elimination of benzene series at low temperature and preparation and application

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Experimental program
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Effect test

Embodiment 1

[0020] (1) the preparation method of above-mentioned catalyst provided by the present invention, comprises the steps:

[0021] KAc with a concentration of 0.1 mol / L and 0.1 mol / L HAc are mixed to form a buffer solution at a ratio of KAc / HAc molar ratio=0.1, and the pH is adjusted to 3.7. Add this buffer solution to 1.0mol / L Mn(Ac) 2 In solution (wherein, buffer solution: Mn(Ac) 2 solution (volume ratio)=0.2:1), mix well, then add 0.1mol / LKMnO 4 The solution was slowly dropped into the above mixed solution (where KMnO 4 :Mn(Ac) 2 (molar ratio) = 0.5:1), stirred for 2 hours, sealed and aged for 12 hours, refluxed at 80 for 20 hours, vacuum filtered, rinsed with deionized water until neutral, and dried at 100°C for 10 hours to obtain black OMS-2 The body is then ground into powder, and fired at 300°C at a rate of 1°C / min for 4 hours to obtain OMS-2-I. Its specific surface area is 100m 2 / g, high thermal stability (heating to 600 ° C structure does not change), figure 1 The...

Embodiment 2

[0023] (1) the preparation method of above-mentioned catalyst provided by the present invention, comprises the steps:

[0024] KAc with a concentration of 0.1 mol / L and 0.1 mol / L HAc are mixed to form a buffer solution at a ratio of KAc / HAc molar ratio=0.1, and the pH is adjusted to 3.7. Add this buffer solution to 1.0mol / L Mn(Ac) 2 In solution (wherein, buffer solution: Mn(Ac) 2solution (volume ratio)=0.2:1), mix well, then add 0.1mol / LKMnO 4 The solution was slowly dropped into the above mixed solution (where KMnO 4 :Mn(Ac) 2 (molar ratio) = 1:1), stirred for 2 hours, sealed and aged for 12 hours, refluxed at 80 for 20 hours, vacuum filtered, rinsed with deionized water until neutral, and dried at 100°C for 10 hours to obtain black OMS-2 The body is then ground into powder, and fired at 500°C at a rate of 1°C / min for 1 hour to obtain OMS-2-II. Its specific surface area is 105m 2 / g, high thermal stability (heating to 600 ° C structure does not change), figure 1 The XR...

Embodiment 3

[0027] (1) the preparation method of above-mentioned catalyst provided by the present invention, comprises the steps:

[0028] KAc with a concentration of 0.1 mol / L and 0.1 mol / L HAc are mixed to form a buffer solution according to the ratio of KAc / HAc molar ratio=10.0, and the pH is adjusted between 5.6. With 2.0g of PVP (molecular formula (C 6 h 9 NO) n , molecular weight 10000) dissolved in 2.0mol / L Mn(Ac) 2 In solution (wherein, PVP:Mn(Ac) 2 (number of moles)=0.004:1), the above buffer solution is added in this solution (wherein, buffer solution: Mn(Ac) 2 solution (volume ratio)=0.5:1), mix well, and then add 0.4mol / L KMnO 4 The solution was slowly dropped into the above mixed solution (wherein, KMnO 4 :Mn(Ac) 2 (molar ratio)=0.5:1), stirred for 4 hours, sealed and aged for 12 hours, refluxed at 120°C for 26 hours, vacuum filtered, rinsed with deionized water until neutral, and dried at 140°C for 12 hours to obtain black OMS-2 The precursor was then ground into pow...

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Abstract

The invention discloses an OMS-2catalyst used in the elimination of benzene series at the low temperature, preparation and application. The catalyst is a manganese oxide octahedral molecular sieve and has a molecular formula of KMn8O16.nH2O. The material is prepared by using a reflux method which comprises the following steps of: preparing buffer solution of KAc-HAc with a pH value of 3.7 to 5.6; adding the buffer solution into PVP-containing Mn(Ac)2 solution; adding solution of KMnO4; stirring; refluxing; aging by sealing; filtering; washing with water; drying; baking; and performing other processing. The catalyst of the invention has the advantages of higher specific area and heat stability, high activity and high stability when the catalyst is applied to the elimination of the benzene series through low-temperature catalytic combustion, capacity of keeping the elimination ratio of the benzene series over 90 percent and not changed within 100 hours, cheap used raw material, namely manganese acetate, simple preparation process, no load of other metals or noble metals,.

Description

technical field [0001] The invention relates to a manganese oxide octahedral molecular sieve (OMS-2) and its preparation for catalytic combustion and elimination of benzene series, and its use for 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 of inc...

Claims

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Application Information

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IPC IPC(8): B01J29/04B01D53/86B01D53/72
Inventor 叶青闫立娜程水源康天放
Owner BEIJING UNIV OF TECH
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