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Medium/low temperature SCR (Selective Catalytic Reduction) denitration catalyst with gamma-Al2O3 as carrier and preparation method thereof

A technology of aluminum oxide and denitration catalyst, which is applied in the field of formula composition and preparation of medium and low temperature selective catalytic reduction denitration catalyst, can solve the problems of high cost, poor water and sulfur resistance, complicated preparation process, etc., and achieves high utilization rate , stable performance and simple preparation process

Inactive Publication Date: 2012-07-04
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activity of conventional SCR catalysts generally requires a higher temperature (300-400°C), while the flue gas temperature of some coal-fired devices is generally in the low-to-medium temperature range, but currently, catalysts with high SCR denitrification efficiency can be obtained in the low-to-medium temperature stage Few, and there are problems such as complex preparation process, high cost, poor water resistance and sulfur resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. The γ-Al of the present invention 2 o 3 Medium and low temperature SCR denitrification catalyst as carrier and its preparation:

[0041] (1) Using γ-Al 2 o 3 As a carrier, it is characterized by: γ-Al 2 o 3 The specific surface area is 142m 2 / g, the total pore volume is 0.43cm 3 / g, the average pore diameter is 12nm.

[0042] (2) The preparation method of the composite impregnation solution: add manganese acetate, lanthanum nitrate, and iron nitrate to the water to prepare the composite impregnation solution. The composite impregnation solution is composed of the following components in mass percentage:

[0043] Manganese acetate 7%,

[0044] Lanthanum nitrate 4%,

[0045] Iron Nitrate 10%,

[0046] The rest is water.

[0047](3) Loading of active components: the carrier γ-Al 2 o 3 Immerse in the composite impregnation solution prepared in step (2) for 3-15 hours, take it out, dry it at room temperature (20°C), and then calcinate at 350-600°C for 1-6 ho...

Embodiment 2

[0055] The preparation method and product are the same as in Example 1, only the composition of the simulated flue gas is changed, and the application is as follows:

[0056] Taking 0.50g of the catalyst of the present invention as the experimental object, within the temperature range of 200-350°C, the space velocity is 15,000 / h, and the simulated flue gas composition is: 1000ppm NO, NH 3 / NO=1.1, 5%O 2 , 400ppm SO 2 , 10%H 2 O, the balance gas is N 2 , its denitrification efficiency is 77.12% at 200°C and 88.32% at 300°C. Usually, SO in flue gas 2 and H 2 O can cause catalyst poisoning, thereby reducing its denitrification efficiency. As can be seen from the above, the catalyst of the present invention has better anti-SO 2 and H 2 O performance, its denitrification efficiency is still at a high level, which is higher than that of existing products under the same conditions (about 70%).

Embodiment 3

[0058] 1. The γ-Al of the present invention 2 o 3 Medium and low temperature SCR denitrification catalyst as carrier and its preparation:

[0059] (1) Using γ-Al 2 o 3 As a carrier, it is characterized by: γ-Al 2 o 3 The specific surface area is 142m 2 / g, the total pore volume is 0.43cm 3 / g, the average pore diameter is 12nm.

[0060] (2) The preparation method of the composite impregnation solution: add manganese acetate, lanthanum nitrate, and iron nitrate to the water to prepare the composite impregnation solution. The composite impregnation solution is composed of the following components in mass percentage:

[0061] Manganese acetate 5%,

[0062] Lanthanum nitrate 3%,

[0063] Iron Nitrate 6%,

[0064] The rest is water.

[0065] (3) Loading of active components: the carrier γ-Al 2 o 3 Immerse in the composite impregnation solution prepared in step (2) for 3-15 hours, take it out, dry it at room temperature (20°C), and then calcinate at 350-600°C for 1-6 ho...

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Abstract

The invention belongs to the technical field of NOx control in environmental protection and relates to a medium / low temperature SCR (Selective Catalytic Reduction) denitration catalyst taking gamma-Al2O3 as a carrier and a preparation method thereof. The catalyst consists of the following ingredients according to the mass percentage content: 2-16% of MnO, 1-10% of La2O, 1-10% of FeO and the allowance of the carrier gamma-Al2O3; and the preparation method comprises the following steps: gamma-Al2O3 is soaked into composite soaking liquid with 5-25% of manganese acetate, 1-10% of lanthanum nitrate and 5-25% of ferric nitrate respectively, then is dried and is calcined at 350-600 DEG C for 1-6 hours, therefore, the catalyst is obtained. The medium / low temperature denitration catalyst is prepared by loading various metallic oxides to realize the dispersion optimization of active ingredients and the catalysis cooperation among the ingredients; at 200 DEG C, the conversion rate of NO is morethan 85%, and the water and sulfur resistance is better. The preparation method is simple and is easy in operation, and the catalyst is steady in activity and long in service life.

Description

technical field [0001] The invention belongs to NO in environmental protection x In the field of control technology, it specifically involves a new type of high-efficiency γ-Al 2 o 3 The invention relates to the formula composition and preparation method of medium and low temperature (200-350 DEG C) selective catalytic reduction (SCR) denitrification catalyst with carrier. Background technique [0002] In the field of environmental protection, nitrogen oxides (NO x ) emissions are receiving more and more attention, the main components of which are NO and NO 2 Among them, NO accounts for more than 90%, which 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 hemoglobin The affinity of carbon dioxide is more than 1000 times that of CO, which can seriously damage people's eyes and stomach...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/56
Inventor 李彩亭赵伟伟李珊红路培曾光明张星
Owner HUNAN UNIV
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