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Preparation method for denitration catalyst

The technology of denitration catalyst and salt compound is applied in the field of preparation of denitration catalyst, which can solve the problems of small specific surface area of ​​denitration catalyst, few internal pores of denitration catalyst, low utilization rate of effective active sites, etc. The effect of improving utilization

Inactive Publication Date: 2015-04-01
HAINAN UNIVERSITY
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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.

Method used

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  • Preparation method for denitration catalyst
  • Preparation method for denitration catalyst
  • Preparation method for denitration catalyst

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preparation example Construction

[0027] The invention provides a method for preparing a denitration catalyst, including:

[0028] Reacting a manganese salt, a salt compound, and a thiosulfate salt 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 present invention reacts manganese salt, salt compound and thiosulfate in a solvent to obtain a reaction product. In the embodiment of the present invention, the molar ratio of the manganese salt, the salt compound and the thiosulfate salt may be (1.5-10):1:(2.5-11); in other embodiments, the manganese salt The molar ratio of the salt compound and the thiosulfate salt may be (2-8):1:(3-8); in other embodiments, the molar ratio of the manganese salt, the salt compound and the thiosulfate salt The ratio can be (3~5):1:(4~6). In the present invention, there is no particular limitation on the amount of the solvent, as long as t...

Embodiment 1

[0052] 20.00g of manganese acetate and 3.05g of potassium permanganate were mixed with water to form a mixed solution, the molar concentration of manganese acetate in the mixed solution was 0.1 mol / L; while stirring, 67.4 was added dropwise to the above mixed solution mL of ammonium thiosulfate aqueous solution with a molar concentration of 2.0 mol / L was subjected to 2h aging treatment; the obtained aging treatment product was transferred to a polytetrafluoroethylene-lined reactor, and 0.5 was carried out at 150°C under static conditions. Hour response

[0053] The obtained reaction product was naturally cooled to room temperature, and the reaction product cooled to room temperature was subjected to suction filtration. The product after suction filtration was repeatedly washed with deionized water and absolute ethanol to neutrality, and the washed product was kept at 110°C. After drying for 4 hours, the dried product is calcined at 500° C. for 3 hours to obtain a denitration cata...

Embodiment 2

[0057] 18.00g of manganese sulfate and 5.52g of hydrated ferrous sulfate with water were prepared into a mixed solution, the molar concentration of manganese sulfate in the mixed solution was 0.15 mol / L; under stirring, 46.4 was added dropwise to the above mixed solution mL of ammonium thiosulfate solution with a molar concentration of 3.0 mol / L was subjected to 6 hours of aging treatment; the obtained aging treatment product was transferred to a polytetrafluoro-lined reactor, at 180 ℃, standing conditions for 2 Hour response

[0058] The obtained reaction product was naturally cooled to room temperature, and the reaction product cooled to room temperature was subjected to suction filtration. The product after suction filtration was repeatedly washed with deionized water and absolute ethanol to neutrality, and the washed product was kept at 110°C. After drying for 12 hours, the dried product is calcined at 350° C. for 4 hours to obtain a denitration catalyst.

[0059] The denitrat...

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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 amount of fossil fuels burned continues to increase, and the emissions of pollutant gases including nitrogen oxides have soared. There are many types 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 denitration 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 largely determi...

Claims

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Application Information

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Patent Type & Authority Applications(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 UNIVERSITY
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