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A kind of preparation method of denitrification catalyst

A technology of denitrification catalysts and salt compounds, which is applied in the field of preparation of denitrification catalysts, can solve the problems of small specific surface area of ​​denitrification catalysts, fewer internal pores of denitrification catalysts, and low utilization rate of effective active sites, etc., to achieve reduced diffusion resistance, low cost, The effect of improving the utilization rate

Inactive Publication Date: 2017-05-17
HAINAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The denitration catalyst prepared by the co-precipitation method provided by the prior art has a small specific surface area, and the inner pores of the denitration catalyst are few, and the utilization rate of the effective active site is not high, which makes the denitration activity of the denitration catalyst poor.

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  • A kind of preparation method of denitrification catalyst
  • A kind of preparation method of denitrification catalyst
  • A kind of preparation method of denitrification catalyst

Examples

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preparation example Construction

[0027] The invention provides a preparation method of a denitration catalyst, comprising:

[0028] reacting manganese salt, salt compound and thiosulfate in a solvent to obtain a reaction product, the salt compound including permanganate, iron salt or cerium salt;

[0029] The reaction product is calcined to obtain a denitration catalyst.

[0030] The invention reacts manganese salt, salt compound and thiosulfate in a solvent to obtain a reaction product. In an embodiment of the present invention, the molar ratio of the manganese salt, salt compound and thiosulfate may be (1.5-10):1:(2.5-11); in other embodiments, the manganese salt , the mol ratio of salt compound and thiosulfate can be (2~8):1:(3~8); In another embodiment, the molar ratio of described manganese salt, salt compound and thiosulfate The ratio may be (3-5):1:(4-6). In the present invention, there is no special limitation on the amount of the solvent used, as long as the solvent provides a liquid environment f...

Embodiment 1

[0052] 20.00g of manganese acetate and 3.05g of potassium permanganate were mixed with water, and the molar concentration of manganese acetate in the mixed solution was 0.1mol / L; under the condition of stirring, 67.4 mL of ammonium thiosulfate aqueous solution with a molar concentration of 2.0mol / L was subjected to aging treatment for 2 hours; the obtained aging treatment product was transferred to a polytetrafluoro-lined reactor, and subjected to 0.5 hours of response;

[0053] Naturally cool the obtained reaction product to room temperature, carry out suction filtration on the reaction product cooled to room temperature, wash the product after suction filtration with deionized water and absolute ethanol repeatedly to neutrality, and place the washed product at 110°C After drying for 4 hours, the dried product was calcined at 500° C. for 3 hours to obtain a denitration catalyst.

[0054] The denitration catalyst prepared in Example 1 of the present invention was subjected to...

Embodiment 2

[0057] The manganese sulfate of 18.00g and the hydrated ferrous sulfate of 5.52g are mixed with water, and the molar concentration of manganese sulfate in the mixed solution is 0.15mol / L; Under the condition of stirring, dropwise add 46.4 Ammonium thiosulfate aqueous solution with a molar concentration of 3.0 mol / L was subjected to aging treatment for 6 hours; the obtained aging treatment product was transferred to a polytetrafluoro-lined reaction kettle, and carried out at 180°C under static conditions for 2 hours. hours of response;

[0058] Naturally cool the obtained reaction product to room temperature, carry out suction filtration on the reaction product cooled to room temperature, wash the product after suction filtration with deionized water and absolute ethanol repeatedly to neutrality, and place the washed product at 110°C After drying for 12 hours, the dried product was calcined at 350° C. for 4 hours to obtain a denitration catalyst.

[0059] The denitration catal...

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Abstract

The invention provides a preparation method for a denitration catalyst. The preparation method comprises the following steps: reacting a manganese salt, salt compounds and thiosulfate in a solvent, thereby obtaining a reaction product, wherein the salt compounds include permanganate, ferric salt or cerium salt; and roasting the reaction product to obtain the denitration catalyst. The preparation method provided by the invention is used for preparing the denitration catalyst through a hydrothermal synthesis method; the prepared denitration catalyst has an urchin-like morphological structure as well as a loose and porous structure, and can be used for providing more contact area, reducing the diffusion resistance and increasing the utilization rate of the active center of the denitration catalyst in the denitration process. Therefore, compared with the catalyst prepared by the conventional method, the denitration catalyst prepared by the preparation method disclosed by the invention has relatively good denitration activity. According to the experimental results, when the denitration catalyst provided by the invention is adopted to perform denitration on the industrial flue gas at 150-250 DEG C, the denitration rate is over 80%.

Description

technical field [0001] The invention relates to the technical field of low-temperature denitration, in particular to a preparation method of a denitration catalyst. Background technique [0002] With the continuous development of the economy, the burning of fossil fuels continues to increase, and the emission of polluting gases including nitrogen oxides has increased sharply. There are many kinds of nitrogen oxides, mainly nitrogen monoxide and nitrogen dioxide, which have caused great damage to the environment. In order to reduce the pollution of nitrogen oxides, the development and application of denitrification catalysts have attracted people's attention. [0003] At present, the most widely used denitrification technology is selective catalytic reduction (SCR). Studies have shown that the catalytic reduction reaction is mainly carried out on the surface of the denitration catalyst, and the specific surface area and micropore characteristics of the denitration catalyst l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/56B01D53/90
Inventor 丁春华姜宏汪国庆员晓刚赵涵悦
Owner HAINAN UNIV
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