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Supported manganese-based low-temperature denitrification catalyst and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of poor catalytic activity and poor dispersion, and achieve high and low temperature denitrification activity, low Live temperature, reduce the effect of agglomeration

Active Publication Date: 2017-12-26
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion of the active components of the catalyst on the carrier is poor, resulting in poor catalytic activity

Method used

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  • Supported manganese-based low-temperature denitrification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) 1.79g of manganese nitrate and 0.87g of cerium nitrate were dissolved in 10mL of water to form a mixed solution of manganese salt and cerium salt, and 7.17g of Span-80, 10.75g of Trion X-100, 8.5g of n-hexanol and 90mL of cyclic Add hexane to the above mixed solution, stir until clear, and obtain a microemulsion containing manganese salt and cerium salt; wherein, the molar ratio of water, mixed surfactant, n-hexanol, and cyclohexane is 1:0.06:0.15:1.5;

[0028] 2) Add 91.7g of titanium sol (mass fraction: 18.0%) into the above microemulsion, stir for 1h, then adjust its pH value to 10 with ammonia water, place in an oven and heat at 85°C for 5h to obtain xerogel;

[0029] 3) Grinding the xerogel and calcining at 500°C for 3h to obtain CeO 2 -MnO x / TiO 2 denitrification catalyst.

[0030] The active component of the denitration catalyst is CeO 2 -MnO x Nanoparticles, the average particle size of the nanoparticles is 11nm. The specific surface of the denitration...

Embodiment 2

[0032] 1) 1.79g of manganese nitrate and 0.33g of ferric chloride were dissolved in 10mL of water to form a mixed solution of manganese salt and iron salt, and 7.17g of Span-80, 10.75g of Trion X-100, 8.5g of n-hexanol and 90mL of cyclic Add hexane to the above mixed solution, stir until clear, and obtain a microemulsion containing manganese salt and iron salt; wherein, the molar ratio of water, mixed surfactant, n-hexanol, and cyclohexane is 1:0.06:0.15:1.5;

[0033] 2) Add 91.7g of titanium sol (mass fraction: 18.0%) into the above microemulsion, stir for 1h, then adjust its pH value to 10 with ammonia water, place in an oven and heat at 87°C for 5h to obtain xerogel;

[0034] 3) Grinding the xerogel and calcining at 550°C for 3 hours to obtain Fe 2 o 3 -MnO x / TiO 2 denitrification catalyst.

[0035] The active component of the denitration catalyst is Fe 2 o 3 -MnO x Nanoparticles, the average particle size of the nanoparticles is 6nm. The specific surface of the de...

Embodiment 3

[0037]1) 1.79g of manganese nitrate and 0.26g of cobalt chloride were dissolved in 10mL of water to form a mixed solution of manganese salt and cobalt salt, 7.17g of Span-80, 10.75g of Trion X-100, 8.5g of n-hexanol and 90mL of cyclohexane Alkanes were added to the above mixed solution, stirred until clarification, and a microemulsion containing manganese salt and cobalt salt was obtained; wherein, the molar ratio of water, mixed surfactant, n-hexanol, and cyclohexane was 1:0.06:0.15:1.5;

[0038] 2) Add 91.7g of titanium sol (mass fraction: 18.0%) into the above microemulsion, stir for 1h, then adjust its pH value to 10 with ammonia water, place it in an oven and heat at 90°C for 6h to obtain a xerogel;

[0039] 3) Grinding the xerogel and calcining at 580°C for 3h to obtain CoO-MnO x / TiO 2 denitrification catalyst.

[0040] The active component of the denitration catalyst is CoO-MnO x Nanoparticles, the average particle size of the nanoparticles is 16nm. The specific su...

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Abstract

The invention relates to a supported manganese based low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following specific steps: (1) dissolving cerate, ferric salt or cobalt salt and manganous salt into water to form a metal salt solution, adding a nonionic surfactant, a cosurfactant and an organic solvent into the metal salt solution, and stirring till the solution is clear, thereby obtaining a microemulsion, wherein the molar ratio of the water to the nonionic surfactant to the cosurfactant to the organic solvent is equal to 1:(0.03-0.6):(0.1-1.2):(1-5); (2) adding titanium sol into the microemulsion, stirring, and regulating the pH of the microemulsion to 8-11 by a pH regulator, and heating to obtain xerogel; and (3) grinding and calcining the xerogel to obtain the denitration catalyst. According to the preparation method, active components of the catalyst are uniformly dispersed in a whole supporter, TiO2, and thus are all deposited on the supporter. The denitration catalyst has a wide temperature range of low-temperature activity and high catalytic activity.

Description

technical field [0001] The invention relates to a catalyst, in particular to a supported manganese-based low-temperature denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, and it is the precursor to acid rain, secondary fine particles and other problems. Given NO x Harm to the ecological environment, control NO x The generation and emission of pollutants are very important issues. Currently, control NO x Emission technology mainly refers to low NO x Combustion technology and flue gas NO x removal technology, while the NO x Among the removal technologies, selective catalytic reduction (SCR) is the most widely used flue gas denitrification technology in the world, and the denitrification rate can reach 90%. [0003] Currently, manganese-based (MnO x / TiO 2 ) The methods of denitrification catalyst mainly include impregnation method, co-precipitation method and hydrothermal me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/34B01J23/8892B01J2523/00B01J2523/3712B01J2523/47B01J2523/72B01J2523/842B01J2523/845
Inventor 赵春林吴彦霞梁海龙唐婕
Owner CHINA BUILDING MATERIALS ACAD
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