Coal ash and attapulgite compound SCR denitration catalyst and preparation method thereof

The technology of denitration catalyst and attapulgite is applied in the field of fly ash-attapulgite composite SCR denitration catalyst and its preparation, which can solve the problems of large catalyst loss and serious high temperature ablation of activated carbon, and achieves low utilization rate and strong adsorption. performance, the effect of improving denitration activity and efficiency

Inactive Publication Date: 2012-11-07
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the catalyst prepared with activated carbon as the carrier is that the rich specific surface area of ​​the activated carbon carrier is conducive to the dispersion of the active components, and it has a certain anti-SO2 performance, but the activated carbon is ablated at high temperature during the activation and regeneration process. Too serious, resulting in excessive catalyst loss

Method used

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  • Coal ash and attapulgite compound SCR denitration catalyst and preparation method thereof
  • Coal ash and attapulgite compound SCR denitration catalyst and preparation method thereof
  • Coal ash and attapulgite compound SCR denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Mn1 / FA-PG

[0038] The preparation of catalyst carrier in the present embodiment:

[0039] Mix 50g of attapulgite clay with 100g of fly ash and stir evenly to obtain a mixture, add 150mL of H2O with a mass concentration of 9-10% in the mixture 2 SO 4 Solution, add water and stir evenly, then stand still for 24 hours to obtain sample a, the amount of water added is subject to the uniform stirring; add water to sample a and stir evenly, discard the supernatant after centrifugation, repeat the operation until the supernatant pH=5-6 , to obtain sample b after discarding the supernatant; stir sample b evenly, let it stand at room temperature for 48 hours, put it into a SET type twin-screw wet extrusion granulator, and shape it into a bottom diameter of 2-3mm after mixing and extrusion , cylindrical carrier particles with a height of 3-5 mm; the cylindrical particles were dried at 50°C for 5 hours, and then dried at 105°C for 12 hours to obtain sample c, and samp...

Embodiment 2

[0043] Example 2: Mn10 / FA-PG

[0044] The preparation of catalyst carrier in the present embodiment:

[0045] 50g of attapulgite clay and 50g of fly ash are mixed and stirred evenly to obtain a mixture, and 200mL of H with a mass concentration of 9-10% is added to the mixture 2 5O 4 Solution, add water and stir evenly, then stand still for 24 hours to obtain sample a, the amount of water added is subject to the uniform stirring; add water to sample a and stir evenly, discard the supernatant after centrifugation, repeat the operation until the supernatant pH=5-6 , to obtain sample b after discarding the supernatant; stir sample b evenly, let it stand at room temperature for 50 hours, put it into a SET type twin-screw wet extrusion granulator, and shape it into a bottom diameter of 2-3mm after mixing and extrusion , cylindrical carrier particles with a height of 3-5mm; the cylindrical particles were dried at 50°C for 5 hours, and then dried at 105°C for 12 hours to obtain samp...

Embodiment 3

[0049] Example 3: Mn5 / FA-PG

[0050] The preparation of catalyst carrier in the present embodiment:

[0051] Mix 30g of attapulgite clay with 50g of fly ash and stir to obtain a mixture, add 80mL of 9-10% H in the mixture 2 SO 4 Solution, add water and stir evenly, then stand still for 24 hours to obtain sample a, the amount of water added is subject to the uniform stirring; add water to sample a and stir evenly, discard the supernatant after centrifugation, repeat the operation until the supernatant pH=5-6 , to obtain sample b after discarding the supernatant; stir sample b evenly, let it stand at room temperature for 60 hours, put it into a SET type twin-screw wet extrusion granulator, and shape it into a bottom diameter of 2-3mm after mixing and extrusion , cylindrical carrier particles with a height of 3-5 mm; the cylindrical particles were dried at 50°C for 5 hours, and then dried at 105°C for 12 hours to obtain sample c, and sample c was calcined at 300°C for 2 hours i...

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Abstract

The invention discloses a coal ash and attapulgite compound SCR denitration catalyst and a preparation method thereof. Coal ash and attapulgite compound are used as catalyst carriers for carrying the compound material of manganese oxide. The preparation method comprises the following steps: mixing the coal ash with the attapulgite, making the mixture into coal ash and attapulgite compound catalyst carrier by scoring, molding, drying and burning, using the isopyknic immersion method to carry the compound carrier on the catalyst precursor, drying and burning so as to acquire the finished product. In the invention, the coal ash and the attapulgite cheaply obtained are used as the catalyst carriers, so the cost of the catalyst and the environmental loading of the catalyst are reduced, the mouldability and the heat stability are better, and the low-temperature activity of the catalyst is better because of the loading of manganese active component.

Description

1. Technical field [0001] The invention relates to the nitrogen oxide treatment of coal-burning flue gas in the technical field of environmental protection, in particular to a fly ash-attapulgite composite SCR denitrification catalyst and a preparation method thereof. 2. Background technology [0002] my country is a big coal-fired country, and coal-fired power plants produce a lot of dust, SOx, NOx and harmful metal elements in the production process. Nitrogen oxides (NOx) emitted in flue gas are more harmful to the environment than sulfides. NOx in the atmosphere can cause acid rain, photochemical smog, eutrophication of surface water, etc., which damage the ecological environment and endanger human health. . The control of NOx emissions in the atmosphere has attracted global attention, and it is also a key and difficult point in my country's current atmospheric environmental protection. Therefore, the treatment of NOx is particularly important. At present, the control m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/90B01D53/56
Inventor 张先龙时博文吴雪平杨保俊姜伟平王百年
Owner HEFEI UNIV OF TECH
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