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Preparation method of cobalt-cerium composite oxide catalyst and cobalt-cerium composite oxide catalyst

A technology of composite oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of large catalyst particles, cumbersome catalysts, and difficult control , to achieve the effect of simplifying the process conditions

Inactive Publication Date: 2016-01-06
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the preparation of cobalt-cerium composite oxide catalysts by co-precipitation method more cumbersome and difficult to control, and the formed catalyst particles are relatively large, which leads to the fact that the calcination temperature in the later stage should not be too high, making it difficult to achieve high-temperature stability of the catalyst.

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  • Preparation method of cobalt-cerium composite oxide catalyst and cobalt-cerium composite oxide catalyst
  • Preparation method of cobalt-cerium composite oxide catalyst and cobalt-cerium composite oxide catalyst

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preparation example Construction

[0024] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing a cobalt-cerium composite oxide catalyst, which may specifically include the following steps:

[0025] S1, configure the mixed solution of cobalt salt and cerium salt;

[0026] S2, adding a precipitating agent into the mixed solution of cobalt salt and cerium salt, and obtaining precipitation after aging, wherein the precipitating agent is weakly alkaline carbonate or urea;

[0027] S3. Calcining the precipitate obtained in step S1 at 500-1000°C.

[0028] The embodiment of the present invention provides a preparation method of a cobalt-cerium composite oxide catalyst. The co-precipitation method is used to co-precipitate the cobalt salt and the cerium salt with weakly alkaline carbonate or urea, and then the Roasting is carried out under the present co-precipitation method due to the use of sodium hydroxide or potassium hydroxide and need to accurately control multiple f...

Embodiment 1

[0068] Embodiment 1: Preparation of cobalt-cerium composite oxide catalyst with cobalt-cerium molar ratio of 1:1:

[0069] (1) Add 17.46g cobalt nitrate hexahydrate, 26.04g cerium nitrate hexahydrate into the beaker, stir and dissolve in 200ml distilled water;

[0070] (2) Get 23.7g ammonium bicarbonate in another beaker, stir and dissolve in 200ml water;

[0071] (3) drop the precipitating agent solution prepared in step (2) into the aqueous solution prepared in step (1) at room temperature, and age for 3 hours after dropping;

[0072] (4) Suction filter the precipitate obtained in step (3), wash the precipitate 3 times with 500ml of water, then drain it, and dry it at 110°C for 5h;

[0073] (5) Crush the dried precipitate in step (4), heat up to 700° C. at 4° C. / min in a muffle furnace, heat-preserve and roast for 4 hours, and cool to obtain catalyst powder.

Embodiment 2

[0074] Embodiment 2: the cobalt cerium composite oxide catalyst that preparation cobalt cerium molar ratio is 3:1:

[0075] (1) Add 26.19g cobalt nitrate hexahydrate, 13.02g cerium nitrate hexahydrate into the beaker, stir and dissolve in 200ml distilled water;

[0076] (2) Get 21.3g ammonium bicarbonate in another beaker, stir and dissolve in 200ml water;

[0077] (3) drop the precipitating agent solution prepared in step (2) into the aqueous solution prepared in step (1) at room temperature, and age for 3 hours after dropping;

[0078] (4) Suction filter the precipitate obtained in step (3), wash the precipitate 3 times with 500ml of water, then drain it, and dry it at 110°C for 5h;

[0079] (5) Crush the dried precipitate in step (4), heat up to 700° C. at 4° C. / min in a muffle furnace, heat-preserve and roast for 4 hours, and cool to obtain catalyst powder.

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Abstract

The invention provides a preparation method of a cobalt-cerium composite oxide catalyst and the cobalt-cerium composite oxide catalyst, and belongs to the field of catalysts. The preparation method is simple in technology, the high-temperature stability of the catalyst can be improved, and the catalytic activity of the catalyst can be guaranteed simultaneously. The preparation method of the cobalt-cerium composite oxide catalyst comprises the following steps that S1, a mixed solution of cobalt salt and cerium salt is prepared; S2, precipitating agents are added to the mixed solution of the cobalt salt and the cerium salt, and precipitation is obtained after aging, wherein the precipitating agents comprise alkalescent carbonate or urea; S3, the precipitation is calcinated at the temperature ranging from 500 DEG C to 1000 DEG C. The method is used for preparing the cobalt-cerium composite oxide catalyst for catalyzing methane combustion, and the low-temperature catalytic activity and the high-temperature stability of the catalyst are high.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a preparation method of a cobalt-cerium composite oxide catalyst and a cobalt-cerium composite oxide catalyst. Background technique [0002] Natural gas has the advantages of abundant reserves, low price and high thermal efficiency, and has been widely used in gas heating, gas power generation, natural gas vehicles and other fields. However, due to its high combustion flame temperature and insufficient combustion, more NO will be produced. x , CO and other pollutants, while the incomplete combustion of natural gas (methane) discharged into the atmosphere will cause a serious greenhouse effect. Therefore, reducing methane combustion temperature and improving combustion sufficiency have important practical significance for reducing pollutants and methane emissions. [0003] Catalytic combustion has the advantages of low combustion temperature and sufficient combustion, and is considered ...

Claims

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Application Information

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IPC IPC(8): B01J23/83C10L10/00C10L3/00
Inventor 赵伟陈春辉靳琳浩丁天朋贺世家
Owner ENN SCI & TECH DEV
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