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Preparation method of medium-low temperature selective catalytic reduction denitration catalyst

A denitrification catalyst and selective technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of high cost, poor hydrothermal stability, complex preparation process, etc., and achieve low cost, stable activity, and preparation The effect of simple method

Inactive Publication Date: 2012-09-12
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activity of catalysts generally requires high temperature, but the flue gas temperature is generally in the low-to-medium range. However, there are currently few catalysts that can obtain high SCR denitrification efficiency in the low-to-medium temperature stage, and there are complex preparation processes, high costs, and hydrothermal stability. gender issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Catalyst preparation:

[0021] (1) The modification of the activated carbon fiber sample (ACFA), comprising: immersing the activated carbon fiber sample in 80% nitric acid solution for 1.5 hours, air-drying at ambient temperature, then at 300 ° C, mixed gas of carbon dioxide and nitrogen (the volume percentage of carbon dioxide is 5 ~50%) to modify ACFA in the atmosphere to prepare functionalized carrier (ACFB).

[0022] (2) Preparation of composite impregnating solution: it is composed of cerium nitrate, manganese acetate and water, and a composite solution in which cerium nitrate accounts for 10% by mass of the solution and manganese acetate accounts for 60% by mass of the solution is prepared.

[0023] (3) Loading of active components: The carrier ACFB prepared in step (1) was immersed in the composite solution prepared in step (2) for 15 hours, taken out, dried at room temperature, and then heated at 300°C under the protection of an inert gas to obtain a catalyst I...

Embodiment 2

[0026] Catalyst preparation:

[0027] (1) Modification of activated carbon fiber sample (ACFA): the sample was immersed in 30% nitric acid solution for 8 hours, air-dried at ambient temperature, then at 150°C, mixed gas of carbon dioxide and nitrogen (volume percentage of carbon dioxide was 5-50%) ) to modify ACFA in the atmosphere to prepare functionalized carrier (ACFB).

[0028] (2) Preparation of composite impregnating solution: it is composed of cerium nitrate, manganese acetate and water, and a composite solution in which cerium nitrate accounts for 30% by mass of the solution and manganese acetate accounts for 10% by mass of the solution is prepared.

[0029] (3) Loading of active components: The carrier ACFB prepared in step (1) was immersed in the composite solution prepared in step (2) for 5 hours, taken out, dried at room temperature, and then heated at 450°C under the protection of an inert gas to obtain a catalyst In the sample, the mass percentage of cerium oxid...

Embodiment 3

[0032] Catalyst preparation:

[0033] (1) Modification of activated carbon fiber sample (ACFA): the sample was immersed in 50% nitric acid solution for 4 hours, air-dried at ambient temperature, and then mixed with carbon dioxide and nitrogen gas (the volume percentage of carbon dioxide was 5-50%) at 100°C Modified ACFA in the atmosphere, while increasing its specific surface area and pore volume, increased the number of acidic active sites on its surface and the number of mesopores and micropores to prepare a functional carrier (ACFB).

[0034] (2) Preparation of composite impregnating solution: it is composed of cerium nitrate, manganese acetate and water, and a composite solution in which cerium nitrate accounts for 15% by mass of the solution and manganese acetate accounts for 30% by mass of the solution is prepared.

[0035](3) Loading of active components: The carrier ACFB prepared in step (1) was immersed in the composite solution prepared in step (2) for 10 hours, take...

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Abstract

The invention discloses a preparation method of a medium-low temperature selective catalytic reduction denitration catalyst, and the method comprises the following steps: (1) modification of an active carbon fiber sample: soaking the active carbon fiber sample ACFA in a 30-80% salpeter solution for 1-8 hours, and air-drying, and modifying the active carbon fiber sample in the atmosphere of the mixed gas of carbon dioxide and oxygen at the temperature of 100-300 DEG C to obtain a functional carrier ACFB; (2) preparation of a composite soaking solution, ensuring that cerous nitrate accounts for1-30wt% of the solution and manganese acetate accounts for 1-60wt% of the solution; and (3) loading of active components: soaking the carrier ACFB prepared in the step (1) in the composite solution prepared in the step (2) for 3-15 hours, fetching the carrier ACFB, drying at normal temperature, and heating the carrier in the presence of inert gas at the temperature of 150-450 DEG C to obtain the catalyst. The medium-low temperature selective catalytic reduction denitration catalyst has the advantages of high denitration efficiency, good repeatability and relatively good hydrothermal stability, and is cheap, easily obtained and simple to prepare.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to the preparation of a flue gas denitrification catalyst, in particular to the formulation composition of an impregnating solution of a novel high-efficiency medium-low temperature selective catalytic reduction (SCR) denitrification catalyst and a preparation method of the catalyst. Background technique [0002] In the field of environmental protection, NO x The emission of is getting more and more attention, its main components are NO and NO 2 , where NO accounts for NO x More than 90% of NO is very destructive to the natural environment and human health, and will cause major environmental problems such as photochemical smog, acid rain, greenhouse effect and ozone layer hole effect, and serious pollution; NO is very toxic, and its affinity with hemoglobin is CO More than 1000 times of that, it will seriously damage people's eyes and stomach, and it is very poi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/90B01D53/56
Inventor 李彩亭路培李珊红曾光明文青波
Owner HUNAN UNIV