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Mn, Co, Ce and Ti four-component NH3-SCR supported catalyst for low-temperature flue gas denitrification

A technology of NH3-SCR and low-temperature flue gas, which is applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, separation methods, etc. question

Inactive Publication Date: 2015-01-21
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0005] In the actual industrial exhaust pipe, the temperature of the flue gas gradually decreases during the flow process, and the temperature of the flue gas at the outlet is generally about 100°C to 200°C. However, the catalysts currently used generally have a high onset temperature, and there is no consideration Denitrification efficiency at low temperature

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  • Mn, Co, Ce and Ti four-component NH3-SCR supported catalyst for low-temperature flue gas denitrification
  • Mn, Co, Ce and Ti four-component NH3-SCR supported catalyst for low-temperature flue gas denitrification
  • Mn, Co, Ce and Ti four-component NH3-SCR supported catalyst for low-temperature flue gas denitrification

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Embodiment Construction

[0017] The implementation and beneficial effects of the present invention are described below through specific examples, but the implementation scope of the present invention should not be construed in any way.

[0018] Evaluation method of catalyst activity:

[0019] The catalytic activity of the prepared catalyst can be evaluated by the reduction conversion rate of NOx and the corresponding activation temperature. The calculation method of the reduction conversion rate is:

[0020] In the formula, is the concentration of nitrogen oxides at the inlet (mL / m3); is the concentration of nitrogen oxides at the outlet (mL / m3).

[0021] Detection method: Use a fixed-bed microreactor-nitrogen oxide analyzer detection system. The nitrogen oxide analyzer is the Australian EC9841 model, which uses chemiluminescence to detect NO and NO 2 , NOx.

[0022] Specific steps: put 5 mg of the weighed catalyst sample into the fixed bed reaction tube, and feed the reaction gas with the gas...

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Abstract

The invention relates to a four-component NH3-SCR supported metal catalyst for low-temperature flue gas denitrification and a preparation method of the four-component NH3-SCR supported metal catalyst. The invention provides the NH3-SCR catalyst which is obtained by supporting nitrates of Mn, Co, Ce and other elements on nano-scale TiO2-P25 by using a dipping method and roasting to form a multi-component composite metal oxide. The catalyst has acidity and oxidization and is conductive to activating NH3 on the surface of the catalyst by adsorption and improving the denitrification efficiency. The invention further provides the preparation method of the catalyst.

Description

technical field [0001] The invention relates to a kind of NH 3 -SCR catalyst, which is loaded on nano-sized TiO with nitrate of Mn, Co, Ce and other elements by impregnation method 2 -P 25 The invention relates to a multi-component composite metal oxide catalyst formed by roasting, which belongs to the technical field of environmental protection. Background technique [0002] The SCR method is currently the best denitrification technology in industrialization. It can be used alone or in combination with other nitrogen and sulfur removal processes. Commonly used reducing agents include hydrocarbons, ammonia, etc. The basic principle is to use ammonia, urea, and reducing hydrocarbons to generate redox reactions on the surface of the catalyst under certain conditions to selectively reduce nitrogen oxides. Reductively reduced to nitrogen and water. NH 3 -SCR is the best reduction method for industrialization. In general, the SCR reaction temperature is between 280°C and 40...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/90B01D53/56
Inventor 欧阳峰孟姣姣邱露王欢欢
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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