Synthesis method for low-temperature manganese-based compound metal oxide denitration catalysts

A technology of denitrification catalyst and composite metal, which is applied in the field of synthesis of low-temperature manganese-based composite metal oxide denitrification catalyst, and achieves the effects of wide application range, easy availability of raw materials, and easy control of operating conditions

Inactive Publication Date: 2014-08-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on patents on crystal splitting growth for catalyst preparation

Method used

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  • Synthesis method for low-temperature manganese-based compound metal oxide denitration catalysts
  • Synthesis method for low-temperature manganese-based compound metal oxide denitration catalysts
  • Synthesis method for low-temperature manganese-based compound metal oxide denitration catalysts

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Experimental program
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Effect test

Embodiment 1

[0034] Preparation of cobalt-manganese composite oxide (CMO-10): Dissolve cobalt acetate tetrahydrate (0.0067mol) and manganese chloride tetrahydrate (0.0133mol) in 60ml of ethylene glycol, stir and cool down to - 10 oC , stabilized at this temperature for 30 min, and then slowly added an aqueous solution of sodium carbonate (200 ml, 0.2 M) dropwise at a rate of 1.2 ml / min. After the dropwise addition, the resulting precipitation system was further aged for 1 h, filtered, and then the precipitate was washed with deionized water and centrifuged for 60 o C to dry the sediment, and then at 450 o Cobalt manganese oxide (CMO-10) was obtained by calcination under C air atmosphere for 4h. A single pure manganese phase (MnO x -10) and pure cobalt phase oxides (Co 3 o 4 -10), specifically: replacing the mixture of cobalt acetate tetrahydrate and manganese chloride tetrahydrate in the above cobalt manganese oxide CMO-10 preparation method with 0.02mol manganese chloride tetrahydra...

Embodiment 2

[0038] Preparation of iron-manganese composite oxide (Fe-Mn-O-10): ferrous chloride tetrahydrate (0.0067mol) and manganese chloride tetrahydrate (0.0133mol) were dissolved in 60ml of ethylene glycol, stirred under nitrogen atmosphere and cool down to - 10 o C, stabilize at this temperature for 30 minutes, then slowly add aqueous sodium carbonate solution (200ml, 0.2M) dropwise at a rate of 1.2ml / min. After the dropwise addition, the resulting precipitation system was further aged for 1 h, filtered, and then the precipitate was washed with deionized water and centrifuged for 60 o C to dry the sediment, and then at 450 o Calcined under C air atmosphere for 4h to obtain iron manganese oxide (Fe-Mn-O-10). Pure iron phase oxides (Fe 2 o 3 -10) Catalyst, the specific method is as follows: replace the mixture of ferrous chloride tetrahydrate and manganese chloride tetrahydrate in the preparation method of iron manganese oxide (Fe-Mn-O-10) with 0.02mol ferrous chloride tetrahydra...

Embodiment 3

[0042] Preparation of nickel-manganese composite oxide (Ni-Mn-O-10):

[0043] Nickel acetate tetrahydrate (0.0067mol) and manganese chloride tetrahydrate (0.0133mol) were dissolved in 60ml of ethylene glycol, stirred and cooled to - 10 o C, stabilize at this temperature for 30 min, then slowly add aqueous sodium carbonate solution (200 ml, 0.2 M) dropwise at a rate of 1.2 ml / min. After the dropwise addition, the resulting precipitation system was further aged for 1 h, filtered, and then the precipitate was washed with deionized water and centrifuged for 60 o C to dry the sediment, and then at 450 o C calcination under air atmosphere for 4h to obtain nickel manganese oxide (Ni-Mn-O-10). The pure nickel phase oxide (NiO-10) catalyst was prepared by the same method, and the specific method was as follows: 0.02mol nickel acetate tetrahydrate was used to replace nickel acetate tetrahydrate in the preparation method of nickel manganese oxide (Ni-Mn-O-10) And the mixture of manga...

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Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a synthesis method for low-temperature manganese-based compound metal oxide denitration catalysts. According to the method, a manganese salt and a salt from a cobalt salt, a ferric salt or a nickel salt are dissolved in ethylene glycol in a mixed manner; a sodium carbonate water solution is dripped at a low temperature, and coprecipitation is carried out; and coprecipitation products are washed by water, are dried, and are calcined in the air, and products can be obtained. The synthesis method provided by the invention adopts a low-temperature artificially induced crystal splitting technology, one kind of ions from cobalt ions, ferric ions and nickel ions are added, and manganese ion precipitate crystals are induced to split in the manganese ion precipitate crystal growth process. The split crystals do not agglomerate during the growing in low-temperature environment. After the crystals after splitting growth are calcined, manganese-based compound metal oxides with high specific surface area can be obtained, and the manganese-based compound metal oxides can show excellent low-temperature catalytic activity when being used for catalyzing a denitration reaction. The synthesis method has the advantages that the operation is simple, the control is easy, and raw materials can be easily obtained, so the synthesis method is suitable for large-scale production, and in addition, the environment pollution is little.

Description

technical field [0001] The invention relates to a synthesis method of a low-temperature manganese-based composite metal oxide denitration catalyst, belongs to the field of material science, and in particular relates to the technical field of preparation of catalytic materials. Background technique [0002] Nitrogen oxides are extremely harmful air pollutants that can cause photochemical smog, acid rain, and the greenhouse effect. For nitrogen oxides emitted from stationary sources, one of the effective removal methods is to use ammonia as a reducing agent to selectively reduce nitrogen oxides to generate harmless nitrogen and water, called NH 3 -SCR reaction, the reaction equation is as follows: [0003] [0004] Currently used to catalyze NH 3 -The commercialized catalyst for SCR reaction is V 2 o 5 / TiO 2 , but it takes at 300 o C~400 o The catalytic effect of this reaction is only in the higher temperature range of C. Therefore, in practical applications, it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/56
Inventor 赵宗彬孟博邱介山王旭珍
Owner DALIAN UNIV OF TECH
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