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MnO2-NiO active coke low-temperature denitration catalyst and preparation method thereof

A technology for low-temperature denitration and activated coke, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Low, wide range of carrier sources, environment-friendly effect

Inactive Publication Date: 2019-06-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercial catalysts use titanium dioxide as the carrier and vanadium, tungsten, and molybdenum as the active components. The catalyst is not suitable for sintering flue gas denitrification, so the development of low-temperature SCR denitrification catalyst is the key technology

Method used

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  • MnO2-NiO active coke low-temperature denitration catalyst and preparation method thereof
  • MnO2-NiO active coke low-temperature denitration catalyst and preparation method thereof
  • MnO2-NiO active coke low-temperature denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Screen active coke (AC) particles 30-80 mesh, wash with deionized water to pH about 7, then place in an oven to bake for 2 hours, soak the dried active coke in a 5mol / L nitric acid solution in a water bath at 80℃ Stir at medium temperature for 2 hours, then wash with deionized water to a pH of about 7, and then bake at 110°C for 12 hours. Weigh 0.695g of 50% manganese nitrate (Mn(NO3)2) solution and 0.56g of nickel nitrate hexahydrate (Ni(NO3)2·6H2O) in 7.5mL of deionized water, stir well to obtain a mixed solution; weigh 6g for activation The latter activated coke is immersed in the mixed solution in equal volume, first stirred at room temperature for 2 hours, and then allowed to stand at room temperature for 24 hours, the loading of manganese and nickel is 5%, then dried overnight at 50°C, and then baked at 110°C for 5 hours . The dried sample was calcined in a muffle furnace under a nitrogen atmosphere at 400°C for 2h, with a heating rate of 5°C / min, and a nitrogen f...

Embodiment 2

[0031] Screen active coke particles 30-80 mesh, wash with deionized water until the pH is about 7, then place in an oven to bake for 2 hours, soak the dried active coke in a 5mol / L nitric acid solution, and stir in a water bath at 80°C for 2 hours , And then washed with deionized water to a pH of about 7, and then bake at 110 ℃ for 12 hours. Weigh 2.46g of 50% manganese nitrate (Mn(NO3)2) solution and 1.99g of nickel nitrate hexahydrate (Ni(NO3)2·6H2O), dissolve in 12mL of deionized water, stir evenly to obtain a mixed solution; weigh 10g after activation The activated coke is immersed in the mixed solution in equal volume, first stirred at room temperature for 2h, and then allowed to stand at room temperature for 24h, the loading of manganese and nickel is 10%, then dried overnight at 50℃, and then baked at 110℃ for 5h. The dried sample was calcined in a muffle furnace under a nitrogen atmosphere at 400℃ for 2h, with a heating rate of 5℃ / min, and a nitrogen flow rate of 200mL / ...

Embodiment 3

[0033] Screen active coke particles 30-80 mesh, wash with deionized water until the pH is about 7, then place in an oven to bake for 2 hours, soak the dried active coke in a 5mol / L nitric acid solution, and stir in a water bath at 80°C for 2 hours , And then washed with deionized water to a pH of about 7, and then bake at 110 ℃ for 12 hours. Weigh 5.53g of 50% manganese nitrate (Mn(NO3)2) solution and 4.5g of nickel nitrate hexahydrate (Ni(NO3)2·6H2O), dissolve in 12mL of deionized water, stir evenly to obtain a mixed solution; weigh 10g after activation The activated coke is immersed in the mixed solution in equal volume, first stirred at room temperature for 2 hours, and then allowed to stand at room temperature for 24 hours, the loading of manganese and nickel is 15%, then dried overnight at 50°C, and then baked at 110°C for 5 hours. The dried sample was calcined in a muffle furnace under a nitrogen atmosphere at 400℃ for 2h, with a heating rate of 5℃ / min, and a nitrogen flo...

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Abstract

The invention discloses a MnO2-NiO active coke low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: 1) soaking active coke intoa nitric acid aqueous solution, stirring for 1-2h and then filtering, washing with deionized water till pH is 7, and drying for 12h at 100-120 DEG C; 2) preparing a soluble manganese salt and a soluble nickel salt into a mixed solution of manganese and nickel, equivalent-volume dipping the active coke acquired in step 1) into the mixed solution of manganese and nickel, stirring for 1-3h and then standing by for 24h under room temperature, drying overnight at 50 DEG C and drying for 4-5h at 110 DEG C; 3) calcining the active coke acquired in the step 2) for 2h under inert atmosphere at 300-500DEG C. The invention provides the MnO2-NiO active coke low-temperature denitration catalyst and the preparation method thereof. Active coke is taken as a carrier of the denitration catalyst; an equivalent-volume impregnation process is adopted for loading manganese and nickel active components; preparation process is simple, operation is easy and carrier source is extensive; clearance structure ofactive coke is advanced, specific surface area is large and denitration efficiency is high after activation with nitric acid.

Description

Technical field [0001] The invention belongs to the field of air pollution control and relates to a MnO 2 -NiO active coke low-temperature denitration catalyst and its preparation method. Background technique [0002] Nitrogen oxides (NOx) produced by sintering machines in steel plants pose a serious threat to the environment. They are the main source of environmental problems such as acid rain, photochemical smog, and greenhouse effect, and endanger people's health. The sintering process is an indispensable process for steel production. The sintering process produces about 50% of nitrogen oxides. As the national emission standards for nitrogen oxides become more and more stringent, enterprises are gradually required to achieve ultra-low emissions of pollutants. However, there is currently no suitable denitrification technology applied to denitrification of sintering flue gas in steel plants. Sintering flue gas has the characteristics of low temperature, large flue gas volume, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56B01J35/10
Inventor 李建军郭婷刘勤郭家秀张少飞
Owner SICHUAN UNIV
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