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Preparation of iron-based selective catalytic reduction denitration catalyst

A denitration catalyst and selective technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the operating cost, reaction activity operating temperature limit, equipment investment With the problems of high operating cost and large floor space, it can achieve the effect of obvious removal of impurities and hole reaming, cost reduction and high structural strength.

Active Publication Date: 2008-10-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the above two technologies are two independent processes, resulting in disadvantages such as complex system, large floor area, high equipment investment and operating costs.
Currently available technologies for simultaneous desulfurization and denitrification mainly include electron beam radiation, pulsed corona, activated carbon, CuO / Al 2 o 3 method, etc., but there are limitations in operating cost, reactivity, operating temperature, etc., and it is difficult to directly apply to most boiler equipment in my country

Method used

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  • Preparation of iron-based selective catalytic reduction denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The fly ash (mainly containing SiO2) in the power plant dust collector 2 -55%, Al 2 o 3 -27%), quicklime, and ordinary Portland cement are mixed at a weight ratio of 79%, 16%, and 5%, and according to the volume after mixing, they are mixed at a rate of 300g / m 3 The ratio of adding Al 2 o 3 Powder, add water and mix well, then fill into the mold. After aging at normal temperature and pressure for 1 hour, steam aging at 180°C and 10 atm for 8 hours, cold drying, crushing and sieving into particles with a particle size of 1-1.6mm.

[0021] Use mass percent concentration of 67% nitric acid to mix according to the volume-to-weight ratio of nitric acid and molded fly ash = 1ml / g, stir and soak for 1h under the condition of 50°C water bath, then rinse with deionized water until pH2 / g, the main component is: SiO 2 -79%, Al 2 o 3 -15%, which is made into a catalyst carrier.

[0022] Then measure the catalyst carrier in this example to different concentration Fe(NO 3 )...

Embodiment 2

[0026] The fly ash (mainly containing SiO2) in the power plant dust collector 2 -55%, Al 2 o 3 -27%), quicklime, and ordinary Portland cement are mixed at a weight ratio of 70%, 25%, and 5%, and according to the volume after mixing, they are mixed at a rate of 500g / m 3 The ratio of adding Al 2 o 3 Powder, add water and mix well, then fill into the mold. After aging at normal temperature and pressure for 5 hours, steam aging at 190°C and 8 atm for 12 hours, cold drying, crushing and sieving into particles with a particle size of 1-1.6mm.

[0027] Use mass percent concentration of 30% nitric acid to mix according to the volume-to-weight ratio of nitric acid and molded fly ash = 6ml / g, stir and soak for 3 hours in a water bath at 90°C, then rinse with deionized water until pH2 / g, the main component is: SiO 2 -75%, Al 2 o 3 -13%.

[0028] Then measure the catalyst carrier in this example to different concentration Fe(NO 3 ) 3 The saturation adsorption rate of the soluti...

Embodiment 3

[0032] The fly ash (mainly containing SiO2) in the power plant dust collector 2 -55%, Al 2 o 3 -27%), quicklime, and ordinary Portland cement are mixed according to the weight ratio of 70%, 16%, and 14%, and according to the volume after mixing, they are mixed according to the volume of 400g / m 3 The ratio of adding Al 2 o 3 Powder, add water and mix well, then fill into the mold. After aging at normal temperature and pressure for 2 hours, steam aging at 190°C and 8 atm for 12 hours, cold drying, crushing and sieving into particles with a particle size of 1-1.6mm.

[0033] Use mass percent concentration of 50% nitric acid to mix according to the volume-to-weight ratio of nitric acid and molded fly ash = 2ml / g, stir and soak for 3 hours in a water bath at 70°C, then rinse with deionized water until pH2 / g, the main component is: SiO 2 -78%, Al 2 o 3 -14%.

[0034] Then measure the catalyst carrier in this example to different concentration Fe(NO 3 ) 3 The saturation ad...

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Abstract

The present invention relates to a preparation method for an iron-based selective reducing denitration catalyst which takes ferric oxide as an active component and coal powder ash as a carrier and achieves a certain denitration effect simultaneously when catalyzing a denitration action. 70 to 79 wt percent of the coal powder ash, 16 to 25 wt percent of calcium oxide, 5 to 14 wt percent of common silicate cement and a little additive are taken as the raw materials and mixed for autoclave curing so as to make the shaped coal powder ash; after cleanup acid treatment is carried out on the shaped coal powder ash, a dipping method and a program temperature-raising calcination are adopted to support 5 to 15wt percent of Fe2O3 as the active component, then the shaped coal powder ash is put into an atmosphere containing SO2 and O2 for heating and aging. The prepared catalyst has a low cost; the denitration activity can reach more than 90 percent; the desulfurized sulphur capacity can reach 5 to 30wt percent; the working temperature window of the catalyst is broad and more than 200 DEG C. The catalyst can be widely applied to the art of boiler smoke gas treatment in a power station.

Description

technical field [0001] The invention relates to a catalyst preparation method, specifically a method for preparing a selective catalytic reduction denitrification catalyst for flue gas purification by using fly ash and iron-based active substances. Desulfurization effect. Background technique [0002] SO emissions from coal combustion 2 and NO x It is one of the main pollutants that cause acid rain, which has a serious impact on soil and water ecosystems and damages human health. Therefore, the control SO 2 and NO x emissions are of great significance. [0003] At present, flue gas desulfurization and denitrification technologies widely used at home and abroad have their own advantages and limitations. Among them, the flue gas desulfurization (FGD) technology is relatively mature with the wet limestone-gypsum process. Among flue gas denitrification technologies, selective catalytic reduction (SCR) technology is the most mature, with a denitrification efficiency of ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J23/745B01D53/56B01D53/60B01D53/86
Inventor 吴宁宋蔷姚强云端
Owner TSINGHUA UNIV
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