Preparation method of cubic micro-nano composite structure cobalt manganese oxide denitration catalyst

A micro-nano composite structure, cobalt manganese oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of difficult to obtain high-performance denitration catalysts. , It is difficult to atomically disperse and affect the active components, and achieve the effect of increasing adsorption active sites, good low-temperature denitration activity, and low experimental requirements.

Active Publication Date: 2016-01-20
SHANGHAI UNIV
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Problems solved by technology

This is because the cobalt-manganese composite oxide nanoparticles are usually prepared by the traditional co-precipitation method and sol-gel method, and the agglomeration of the obtained nanoparticles is usually serious, which will affect the NH in the denitrification process. 3 and NO x In addition, due to the influence of the difference in the ion product constant of the salt in the traditional method, it is difficult to achieve atomic-level dispersion among the active components, and it is difficult to obtain High performance denitrification catalyst

Method used

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  • Preparation method of cubic micro-nano composite structure cobalt manganese oxide denitration catalyst

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Experimental program
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Effect test

Embodiment 1

[0025] Prepare a mixed brine solution with a concentration of 0.014mol / L cobalt nitrate and manganese sulfate, and make the atomic ratio of cobalt and manganese 1:2. Add 0.05 times the volume of the mixed aqueous solution in dehydrated alcohol and ammonium bicarbonate aqueous solution with a concentration of 0.014mol / L to the above solution in sequence. The resulting mixture was stirred and reacted at 50° C., kept for 9 hours, cooled to room temperature naturally, washed and dried to obtain cobalt-manganese composite carbonate. The dried cobalt-manganese composite carbonate was calcined in the air at a calcination temperature of 550°C, a heating rate of 2°C / min, a heat preservation of 5h, and natural cooling to room temperature to obtain the final product. The microscopic appearance of the catalyst was as follows: figure 1 As shown, the size of the cubes is between 1-3 μm.

[0026] Test the catalytic activity of the above-mentioned catalysts: Sieve the prepared catalyst into...

Embodiment 2

[0028] Prepare a mixed brine solution with a concentration of 0.1mol / L cobalt sulfate and manganese nitrate, and make the atomic ratio of cobalt and manganese 1:1. Add 0.25 times the volume of the mixed aqueous solution of absolute ethanol and ammonium bicarbonate aqueous solution with a concentration of 0.001 mol / L to the above solution in sequence. The obtained mixed solution was stirred and reacted at 80° C., kept for 14 hours, cooled naturally to room temperature, washed and dried to obtain cobalt-manganese composite carbonate. The dried cobalt-manganese composite carbonate is calcined in the air at a calcination temperature of 600°C, a heating rate of 4°C / min, a heat preservation of 6h, and natural cooling to room temperature to obtain the final product.

[0029] Test the catalytic activity of the above-mentioned catalysts: Sieve the prepared catalyst into tablets, take 0.6g of 40-60 mesh particles, and put them into a fixed-bed quartz tube reactor to test the catalytic a...

Embodiment 3

[0031] Prepare a mixed brine solution with a concentration of 0.05mol / L cobalt acetate and manganese sulfate, and make the atomic ratio of cobalt and manganese 1:2. Add dehydrated ethanol 0.5 times the volume of the mixed aqueous solution and ammonium bicarbonate aqueous solution with a concentration of 0.02mol / L to the above solution in sequence. The obtained mixed solution was stirred and reacted at 40° C., kept for 24 hours, cooled to room temperature naturally, washed and dried to obtain cobalt-manganese composite carbonate. The dried cobalt-manganese composite carbonate is calcined in the air at a calcination temperature of 400°C, a heating rate of 4°C / min, a heat preservation of 12h, and natural cooling to room temperature to obtain the final product.

[0032] Test the catalytic activity of the above-mentioned catalysts: Sieve the prepared catalyst into tablets, sieve 0.4g of 60-90 mesh particles, and put them into a fixed-bed quartz tube reactor to test the catalytic ac...

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Abstract

The invention relates to a preparation method of a cobalt-manganese oxide denitration catalyst with a cubic micro-nano composite structure, belonging to the technical field of material preparation and environmental protection. The gist of the present invention is: in the mixed saline solution of the cobalt salt of fixed cobalt, manganese atomic ratio, manganese salt, add the aqueous solution of ammonium bicarbonate of right amount ethanol and right amount successively, the mixed solution of gained is incubated certain time under constant temperature reaction condition After being cooled to room temperature, the spinel phase cobalt-manganese oxide catalyst having the above-mentioned cubic shape of specific micro-nano composite structure was prepared by washing, drying and roasting. The catalyst prepared by the method of the invention has low cost, simple preparation process, uniform appearance and structure, and has excellent low-temperature catalytic performance, thermal stability and water and sulfur resistance performance in selective catalytic reduction of nitrogen oxides by ammonia. The catalyst prepared by the invention can be used for the conversion of nitrogen oxides in the tail gas discharged from boilers, thermal power plants, garbage incineration and the like.

Description

technical field [0001] The invention relates to a preparation method of a denitrification catalyst, which belongs to the technical field of material preparation and environmental protection. The catalyst is used for the selective removal of nitrogen oxides by ammonia. Background technique [0002] Coal is the fossil fuel with the largest reserves in the world, and China's recoverable coal reserves rank third in the world, so my country is a country that uses coal as its main energy source. The greatest contribution of the use of coal to human beings is the continuous supply of energy, but nitrogen oxides (NO x ) will bring a series of ecological and environmental pollution problems such as acid rain, photochemical smog, and ozone depletion, as well as harm to human health. Therefore, effectively reduce the NO in the flue gas of coal-fired combustion x The control and emission of pollutants have always been the focus of relevant research scholars in various countries. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/02B01D53/86B01D53/56
Inventor 张登松施利毅韩瑾李红蕊张剑平
Owner SHANGHAI UNIV
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