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Co-Mn catalyst for catalytic oxidation of NH3, preparation method and applications thereof

A catalytic oxidation and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low nitrogen selectivity, poor selectivity, and poor improvement effect. Obvious and other problems, to achieve the effect of high N2 selectivity, low cost, and excellent N2 selectivity

Active Publication Date: 2019-11-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From this we can see that in order to improve the poor selectivity of Co and Mn in the ammoxidation reaction, acidic metals are used as supports, but the improvement effect is not obvious, and the nitrogen selectivity is still very low

Method used

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  • Co-Mn catalyst for catalytic oxidation of NH3, preparation method and applications thereof
  • Co-Mn catalyst for catalytic oxidation of NH3, preparation method and applications thereof
  • Co-Mn catalyst for catalytic oxidation of NH3, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] WO 3 -CoMn 2 o 4 Catalyst preparation:

[0031] (1) 50wt% manganese nitrate solution is dispersed in ethanol-water solution (wherein ethanol is 1ml, water is 10ml), stirs at 25 ℃, forms the manganese nitrate solution of 10ml0.2mol / l. Slowly add 10ml of 25wt% concentrated ammonia solution dropwise, and keep stirring for 1h. After fully mixing and reacting, record it as solution A. Dissolve and disperse cobalt nitrate in ethanol-water solution (1ml of ethanol and 10ml of water), stir at 25°C to form 10ml of 0.1mol / l cobalt nitrate solution, which is referred to as solution B. The solution B was slowly added dropwise into the solution A, and the stirring time was continued at 25° C. for 1 h, and the reaction was fully mixed. Then transferred to constant temperature heating equipment, reacted at 180°C for 3h, cooled, and calcined at 200°C in an air atmosphere for 5h, with a heating rate of 2°C / min to obtain spinel-structured CoMn 2 o 4 , remember Catalyst A.

[0032]...

Embodiment 2

[0043] The WO prepared in Example 1 3 -CoMn 2 o 4 Catalyst and the Co-Mn (CoMn 2 o 4 ), Co-Mn soaked by tetrabutylammonium hydroxide (CoMn 2 o 4 ) and TiO 2 -CoMn 2 o 4 carry out NH 3 Catalytic oxidation, NH 3 Catalytic oxidation performance test is carried out in continuous operation on a fixed-bed reactor, He is used as balance gas, and NH 3 Analyzer and gas chromatograph on-line analyze the gaseous substance NH after the reaction 3 and N 2 .

[0044] The specific reaction conditions are: 1000ppm NH 3 , 10vol%O 2 , He is used as the balance gas, and the reaction space velocity is 40000h -1 , the mass of catalyst is 0.2g. NH 3 Conversion and N 2 The selectivity calculation formula is as follows: NH 3 Conversion %=[(NH before reaction 3 Concentration - NH after reaction 3 Concentration) / NH before reaction 3 Concentration]*100, N 2 Selectivity=[(N after reaction 2 Concentration - N before reaction 2 Concentration) / 500 / (NH before reaction 3 Concentratio...

Embodiment 3

[0046] To the WO prepared in Example 1 3 -CoMn 2 o 4 Catalyst, investigate the stability of this catalyst, keep embodiment 2 reaction conditions, then in 200 ℃ of continuous operation tests the stability performance of catalyst, its stability performance is as figure 2 shown. After 24 hours of stable operation of the catalyst, the NH 3 Catalytic performance and N 2 The selectivity remains unchanged, showing excellent stability performance.

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Abstract

The invention discloses a Co-Mn catalyst for catalytic oxidation of NH3, a preparation method and applications thereof, and belongs to the technical field of environmentally friendly catalytic treatment. According to the preparation method, the main body of the preparation method is an improved co-precipitation method; a Co-Mn spinel structure catalyst is obtained by using ammonia water as a precipitating agent through stepwise precipitation; defects are formed by soaking in tetrabutylammonium hydroxide; and surface modification is performed with WO3. According to the present invention, the WO3-CoMn2O4 catalyst exhibits good NH3 catalytic performance and good N2 selectivity, can achieves the NH3 conversion rate of 100% and the N2 selectivity of more than 90% at a temperature of 200 DEG C,and can remain unchanged after stable operation for 24 h, such that the results show that the WO3-CoMn2O4 catalyst has advantages of stable structure, excellent catalytic performance and good practical application prospect.

Description

technical field [0001] The present invention relates to a WO 3 Selective catalytic oxidation of NH by modified spinel-structured Co-Mn 3 The catalyst and the preparation method thereof belong to the technical field of environment-friendly catalytic treatment. Background technique [0002] Poor air quality is one of the major environmental concerns in China. Ammonia, as a colorless air pollutant with a pungent odor, is flammable and toxic, posing a threat to human respiratory health and China's atmospheric environment. Although NH in the atmosphere 3 The concentration is much lower than other major air pollutants, such as sulfur dioxide, nitrogen oxides and ozone, but NH 3 Not only does it directly contribute to the generation of inorganic PM2.5 (particulate matter with an aerodynamic diameter less than 2.5 μm), it can also react with gas-phase organic acids to form condensable salts, which in turn plays an important role in the formation of secondary organic aerosols. e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/58
CPCB01D53/8634B01J23/005B01J23/8892B01J2523/00
Inventor 曲振平赵瀚林
Owner DALIAN UNIV OF TECH
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