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Integrated low-temperature SCR (selective catalytic reduction) catalyst, preparation method thereof and application

An SCR catalyst and integrated technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problem that the low-temperature denitrification performance of the catalyst is very high, cannot meet the working conditions of wet desulfurization, and the denitrification performance is not enough Ideal and other issues, to achieve the effect of excellent denitrification performance, uniform catalyst coating, and improved service life

Inactive Publication Date: 2016-11-30
SHANGHAI NAT ENG RES CENT FORNANOTECH
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AI Technical Summary

Problems solved by technology

[0003] Most of the desulfurization systems in China adopt wet desulfurization technology, and the flue gas temperature after wet desulfurization is below 100°C, so the low-temperature denitrification performance of the catalyst is very high. At present, the existing SCR catalyst denitrates at a relatively low temperature Performance is not ideal
Invention patent CN 105363434A "A Manganese-Based SCR Low-Temperature Denitration Catalyst and Its Preparation Method" discloses a manganese-based SCR low-temperature denitrification catalyst, through MnO 2 , CeO 2 , Nb 2 o 3 The combination of the three achieves a denitrification efficiency of more than 90% in the range of 150~260°C as a whole, but the denitrification performance is average at lower temperatures, which cannot meet the operating conditions after wet desulfurization

Method used

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  • Integrated low-temperature SCR (selective catalytic reduction) catalyst, preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 1L of cordierite honeycomb ceramic carrier into 120mL of 0.5 mol / L cobalt nitrate aqueous solution, the cobalt nitrate solution is completely absorbed by the carrier, after standing for 2 hours, dry it in an oven at 100°C, and then bake it in a muffle furnace at 400°C After 4h, cobalt-modified cordierite honeycomb ceramics were obtained.

[0022] Put 1L of cobalt-modified cordierite honeycomb ceramic carrier into 120mL of 4.3 mol / L manganese nitrate aqueous solution, the manganese nitrate solution is completely absorbed by the carrier, after standing for 2 hours, put the carrier into 100 mL of concentrated ammonia solution In the process, concentrated ammonia water was absorbed by the carrier, dried in an oven at 100°C after standing for 2 hours, and then calcined in a muffle furnace at 400°C for 4 hours to obtain a monolithic SCR catalyst.

[0023] Catalyst evaluation method is the same as Comparative Example 1. The test results are shown in Table 1.

Embodiment 2

[0025] Change the 120mL 0.5 mol / L cobalt nitrate aqueous solution into 120mL 0.5 mol / L ferric nitrate aqueous solution in Example 1, and the remaining preparation methods are the same as in Example 1. Catalyst evaluation method is the same as comparative example. The test results are shown in Table 1.

[0026] Table 1 Catalyst denitrification rate data

[0027]

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Abstract

The invention relates to an integrated low-temperature SCR (selective catalytic reduction) catalyst, a preparation method thereof, and belongs to the technical field of industrial denitration. A cordierite honeycomb ceramic serves as a carrier, active components are manganese oxide, and the catalyst belongs to environment-friendly catalysts. The preparation method of the integrated catalyst is simple, large-scale industrial use is facilitated, the active components are uniformly distributed on the surface of the carrier, and the use ratio of the active components is increased. The integrated SCR catalyst can be used for industrial low-temperature denitration conditions, denitration rate reaches 80% or more within the temperature of 125-225 DEG C and can reach 75% or more at the temperature of 100 DEG C, an SCR reactor can be arranged behind a dust removal and desulfurization device, porous channel plugging and intoxication in the use process of the catalyst are avoided, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to an integral low-temperature SCR catalyst and a preparation method thereof, in particular to an integral SCR catalyst with manganese oxide as an active component and iron oxide or cobalt oxide as a promoter and a preparation method thereof. It is applicable to the elimination of low-temperature NOx gas and has application prospects in the field of industrial denitrification technology. Background technique [0002] With the rapid development of my country's economy, energy consumption has increased significantly, and correspondingly, the degree of air pollution has also increased. At present, more than 95% of my country's thermal power plants are mainly coal-fired, and a large amount of emissions are emitted during the coal-fired process. nitrogen oxides, sulfur dioxide and particulate matter. Dust removal technology and flue gas desulfurization technology are becoming more and more mature, and flue gas desulfurization and dust ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/04B01D53/86B01D53/56
CPCB01D53/8628B01J23/8892B01D2258/0283B01J35/56
Inventor 何丹农高振源杨玲赵昆峰袁静蔡婷张涛金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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