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Denitration catalyst with low SO2/SO3 conversion rate and preparation method thereof

A denitrification catalyst, SO3 technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of catalyst denitrification activity reduction, air preheater influence, etc.

Pending Publication Date: 2021-05-18
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonium bisulfate will adhere to the surface of the catalyst, resulting in a decrease in the denitrification activity of the catalyst
And it will also have a serious impact on the air preheater downstream of the denitrification system

Method used

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  • Denitration catalyst with low SO2/SO3 conversion rate and preparation method thereof
  • Denitration catalyst with low SO2/SO3 conversion rate and preparation method thereof
  • Denitration catalyst with low SO2/SO3 conversion rate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] S11. Weigh ferric nitrate and place it in a crucible, add glycine, sodium chloride and deionized water to stir and dissolve, put the mixture in a muffle furnace and calcinate at 750°C for 4 hours, and cool to obtain powder A, wherein glycine and nitric acid The ratio of the amount of iron is 1:1, and the quality of sodium chloride is 5% of the quality of ferric nitrate;

[0036] S12. Weighing the titanium dioxide, and immersing the titanium dioxide in an aqueous solution of ammonium metavanadate and ammonium heptamolybdate, stirring and drying the water, calcining at 400° C. for 4 hours, and cooling to obtain powder B;

[0037] S13. Put powder A and powder B in a high-shear disperser, and shear and disperse at 16,000 rpm for 1 hour to prepare a denitration catalyst.

[0038] V of the prepared denitration catalyst 2 o 5 Content is 0.5%, MoO 3 The content is 8%, iron oxide content is 8%, and the rest is TiO 2 .

Embodiment 2

[0040] S21. Weigh aluminum nitrate and place it in a crucible, add glycine, sodium chloride and deionized water to stir and dissolve, put the mixture in a muffle furnace and calcinate at 800°C for 3 hours, and cool to obtain powder A, wherein glycine and nitric acid The ratio of the amount of aluminum is 1.5:1, and the quality of sodium chloride is 6% of the quality of aluminum nitrate;

[0041] S22. Weighing the titanium dioxide, and immersing the titanium dioxide in an aqueous solution of ammonium metavanadate and ammonium heptamolybdate, stirring and drying the water, calcining at 450° C. for 3.5 hours, and cooling to obtain powder B;

[0042] S23. Put powder A and powder B in a high-shear disperser, and shear and disperse at 15,000 rpm for 1.5 hours to prepare a denitration catalyst.

[0043] V of the prepared denitration catalyst 2 o 5 Content is 1%, MoO 3 The content is 5%, the alumina content is 6%, and the rest is TiO 2 .

Embodiment 3

[0045] S31. Weigh cerium nitrate and place it in a crucible, add glycine, potassium chloride and deionized water to stir and dissolve, put the mixture in a muffle furnace and calcinate at 800°C for 3 hours, and cool to obtain powder A, wherein glycine and nitric acid The ratio of the amount of cerium is 2:1, and the quality of potassium chloride is 8% of the quality of cerium nitrate;

[0046] S32. Weighing the titanium dioxide, and immersing the titanium dioxide in an aqueous solution of ammonium metavanadate and ammonium heptamolybdate, stirring and drying the water, calcining at 600° C. for 1 hour, and cooling to obtain powder B;

[0047] S33. Put powder A and powder B in a high-shear disperser, and shear and disperse at 14,000 rpm for 2 hours to prepare a denitration catalyst.

[0048] V of the prepared denitration catalyst 2 o 5 Content is 2%, MoO 3 The content is 4%, the cerium oxide content is 4%, and the rest is TiO 2 .

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Abstract

The invention relates to the technical field of selective catalytic reduction catalysts, in particular to a denitration catalyst with a low SO2 / SO3 conversion rate and a preparation method thereof. The preparation method comprises the following steps of putting a metal nitrate, glycine and an inorganic salt auxiliary in a solvent, conducting stirring for dissolution, and conducting calcination to obtain a powder A; dipping titanium dioxide in a mixed solution of ammonium metavanadate and ammonium heptamolybdate, conducting stirring and dissolving, and conducting calcining to obtain a powder B; and mixing the powder A and the powder B, and performing high-shear dispersion to obtain the denitration catalyst. The metal oxide is prepared by adopting a glycine combustion method, and the prepared metal oxide is small in particle size, uniform in particle size distribution, multiple in pore channels, high in adsorption capacity and capable of adsorbing SO2 and SO3 on the catalyst in the SCR reaction process, so that the SO2 / SO3 conversion rate of the catalyst is reduced; and the powder A and the powder B can be highly and uniformly mixed under the actions of centrifugal extrusion, high-speed cutting, impacting, grinding and the like generated in the high-shear dispersion process, so that the high denitration activity of the catalyst is guaranteed.

Description

technical field [0001] The invention relates to the technical field of selective catalytic reduction catalysts, in particular to a low SO 2 / SO 3 A denitrification catalyst with conversion rate and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the primary pollutants discharged into the atmosphere by human life activities. Its main sources are from two aspects. One is the combustion of fossil fuels in production and life. Smoke is the main source; the second is exhaust from mobile sources such as vehicles. Nitrogen oxides (NO x ) is a major cause of acid rain, photochemical smog, and destruction of the ozone layer. With the development of my country's productivity, the emission of nitrogen oxides has increased year by year, which has seriously endangered social development and human health, and has become the focus of energy conservation and emission reduction. [0003] Selective catalytic reduction (SCR) is currently the ...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/887B01J37/08B01J35/10B01J33/00B01D53/56B01D53/86B01D53/02B01J20/06B01J20/08B01J20/28B01J20/30
CPCB01J23/28B01J23/8877B01J23/002B01J37/088B01J37/0027B01J33/00B01D53/02B01J20/06B01J20/08B01J20/28016B01J20/3021B01D53/8628B01J2523/00B01D2257/404B01D2257/406B01D2257/302B01D2258/0283B01D2258/06B01J35/61B01J2523/31B01J2523/47B01J2523/55B01J2523/68B01J2523/3712B01J2523/3737B01J2523/842B01J2523/847
Inventor 黄力常峥峰纵宇浩王虎周军高义博刘洋李金珂
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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