A kind of manganese-based catalyst for the treatment of volatile organic compounds and its preparation and application

A technology of volatile organic compounds and manganese-based catalysts, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem that the activity is not as good as precious metals, etc. Achieve high stability and water resistance, long life and high reactivity

Active Publication Date: 2019-06-21
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Transition metals have the advantages of low price and abundant resources. The oxides composed of transition metals have strong anti-sintering, anti-S, and N capabilities in VOCs treatment, but have the disadvantages of being less active than noble metals.

Method used

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  • A kind of manganese-based catalyst for the treatment of volatile organic compounds and its preparation and application
  • A kind of manganese-based catalyst for the treatment of volatile organic compounds and its preparation and application
  • A kind of manganese-based catalyst for the treatment of volatile organic compounds and its preparation and application

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preparation example Construction

[0039] The following is a detailed description of the preparation of the manganese-based catalyst in the present invention, that is, the oxalate colloidal co-precipitation method.

[0040] The concrete operation of oxalate colloidal coprecipitation method is as follows:

[0041] Manganese salts and other metal salts are dissolved in absolute ethanol and stirred at room temperature to prepare a uniform metal solution. Other metal salt solutions include one or two of cobalt salts, cerium salts, and chromium salts. Oxalic acid is dissolved in absolute ethanol to form a uniform and transparent oxalic acid solution at room temperature. Slowly drop the oxalic acid solution into the metal solution, continue to stir for 4-6 h, and alcoholyze the metal salt. The obtained metal solid solution solution is vacuum filtered to obtain a solid material, and then dried in a blast oven at 60-80° C. to obtain a solid layer. The solid layer is calcined in a muffle furnace at 300-700 DEG C to o...

Embodiment 1

[0048] Embodiment 1: manganese-cobalt composite oxide

[0049] Weigh 1.07 g of manganese nitrate aqueous solution with a mass fraction of 50% and 5.24 g of cobalt nitrate hexahydrate and dissolve them in 200 mL of absolute ethanol, stir until dissolved, and form a uniform and transparent metal solution. Another 3.62 g of oxalic acid dihydrate was weighed and dissolved in 50 mL of absolute ethanol, and stirred until dissolved to form a uniform and transparent oxalic acid solution. Slowly drop the oxalic acid solution into the metal solution, and continue stirring for 4 h to form a solid suspension after all the solution is dissolved. The suspension was vacuum-filtered, dried in a blast oven at 70 °C for 12 h, and then roasted in a muffle furnace. The temperature was raised to 500 °C at a heating rate of 2 °C / min and kept for 4 h to obtain Mn 1 co 3 o x catalyst.

[0050] mn 1 co 3 Ox catalyst performance evaluation to benzene catalytic combustion, operation is as follows:...

Embodiment 2

[0054] Example 2: Manganese-cobalt composite oxide

[0055] Weigh 0.73 g of manganese nitrate aqueous solution with a mass fraction of 50% and 5.82 g of cobalt nitrate hexahydrate and dissolve them in 200 mL of absolute ethanol, stir until dissolved, and form a uniform and transparent metal solution. Another 3.62 g of oxalic acid dihydrate was weighed and dissolved in 50 mL of absolute ethanol, and stirred until dissolved to form a uniform and transparent oxalic acid solution. Slowly drop the oxalic acid solution into the metal solution, and continue stirring for 4 h to form a solid suspension after all the solution is dissolved. The suspension was vacuum-filtered, dried in a blast oven at 70 °C for 12 h, and then roasted in a muffle furnace. The temperature was raised to 500 °C at a heating rate of 2 °C / min and kept for 4 h to obtain Mn 1 co 5 o x catalyst.

[0056] mn 1 co 5 Ox catalyst performance evaluation to benzene catalytic combustion, operation is as follows:

...

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Abstract

A manganese-based catalyst for use in the treatment of volatile organic compounds, consisting of manganese oxide and other transition metal oxides, wherein the mass fraction of manganese oxide is less than 60%, while the other transition metal oxides are greater than 40%, the other transition metal oxides being pure MxOy, M=Co, Ce, and Cr, or comprising Co3O4 and MxOy, M=Ce, and Cr, wherein 1≤x≤3 and 1≤y≤4. The method for preparing the manganese-based catalyst is an oxalate colloidal co-precipitation method. In the treatment of volatile organic compounds, the manganese-based catalyst exhibits high activity, a long life, high anti-sintering capacity, and like features in a benzene catalytic combustion reaction. The optimal catalyst may achieve the complete combustion of benzene, a representative model substrate having a stable structure in volatile organic compounds (VOCs), when below 230°C under the reaction conditions of normal pressure and a space velocity of 30000 mL / (g·h), which is comparable with the performance of noble metal catalysts.

Description

[0001] field of invention [0002] The invention relates to a catalyst for treating volatile organic compounds, which belongs to the technical field of material preparation and environmental protection. Specifically, it relates to a manganese-based catalyst for treating volatile organic compounds, as well as its preparation and application. Background technique [0003] As an important part of environmental protection, the treatment of volatile organic compounds (VOCs) has attracted much attention. At present, there are many technologies for VOCs treatment, but the most effective way is catalytic combustion. The choice of catalyst is the key to governance. The commonly used catalysts can be divided into noble metals and non-noble metals. Precious metals have high activity, but their precious metal particles are easy to agglomerate and grow up at high temperature, and they are easy to form volatile sulfides and nitrides with S, N, etc., which will cause the loss of precious m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/889F23G7/07
CPCB01J23/002B01J23/34B01J23/8892B01J2523/00F23G7/07F23G2209/14
Inventor 何丹农袁静叶俊辉高振源赵昆峰蔡婷金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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