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Ferrotitanium composite oxides catalyst for ammonia selective reduction nitric oxides

A nitrogen oxide, ammonia selective technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc. problems such as high space velocity conditions, to achieve the effects of superior sulfur resistance, low price and simple preparation process

Active Publication Date: 2009-03-11
江西中科鸿虔新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the current common NH 3 - The toxicity of the SCR catalyst system to the environment and the human body, and the catalyst system’s resistance to SO in the literature 2 Due to the defects of poor poisoning ability and inability to adapt to high space velocity conditions, a new catalyst for the selective reduction of nitrogen oxides by ammonia was developed

Method used

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  • Ferrotitanium composite oxides catalyst for ammonia selective reduction nitric oxides
  • Ferrotitanium composite oxides catalyst for ammonia selective reduction nitric oxides
  • Ferrotitanium composite oxides catalyst for ammonia selective reduction nitric oxides

Examples

Experimental program
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Effect test

Embodiment 1-4

[0016] Prepare a certain concentration of Fe(NO 3 ) 3 solution and TiCl 4 Mix the solution evenly, slowly add ammonia water dropwise to the mixed solution under stirring with a magnetic stirrer, adjust the pH value to 10 to make the precipitation complete, then carry out suction filtration and washing, put the filter cake in an oven and dry overnight at 100°C , and finally roasted in air at 400°C for 6 hours in a muffle furnace, and the prepared catalyst was ground and sieved, and 20-40 mesh was taken for later use, called catalyst A. Other conditions remained unchanged, and the calcination temperature was changed to 500°C, 600°C, and 700°C to prepare catalysts B, C, and D.

Embodiment 5-8

[0018] Prepare a certain concentration of Fe(NO 3 ) 3 solution and Ti(SO 4 ) 2 Mix the solution evenly, slowly add ammonia water dropwise to the mixed solution under stirring with a magnetic stirrer, adjust the pH value to 10 to make the precipitation complete, then carry out suction filtration and washing, put the filter cake in an oven and dry overnight at 100°C , and finally roasted in air at 400°C for 6 hours in a muffle furnace, and the prepared catalyst was ground and sieved, and 20-40 meshes were taken for later use, called catalyst E. Other conditions remained unchanged, and the calcination temperature was changed to 500°C, 600°C, and 700°C to prepare catalysts F, G, and H.

Embodiment 9

[0020] With the iron-titanium mixed oxide catalyst that embodiment 1-8 makes, carry out NH on self-made miniature fixed-bed reactor 3 Investigation of the Reactivity of Selective Catalytic Reduction of NO. The consumption of catalyst is 0.6ml, and the composition of reaction gas mixture is: [NO]=[NH 3 ]=500ppm, [O 2 ] = 5%, N 2 As a balance gas, the gas space velocity is 50,000h -1 , The reaction temperature is 200-400°C. The reaction results are shown in Table 1.

[0021] Table 1 Evaluation results of catalyst activity

[0022]

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Abstract

The invention relates to a catalyst of selective reduction of nitrogen oxide by ammonia, which mainly solves the existing problems that the commonly used NH3-SCR catalyst system is toxic to environment and human body, the anti-SO2 poisoning ability of the catalyst system is poor in the reference and the catalyst system can not adapt to the conditions of high space velocity. The invention adopts cheap and non-toxic raw materials to prepare a Fe-Ti oxide catalyst with high activity, selectivity, stability and anti-S2 poisoning ability by the simple and practicable co-precipitation method, which can better solve the existing technical problems. If the catalyst is loaded on honeycomb ceramics after being made into pulp, the catalyst is hopeful to be put into practical application of flue gas denitrification of coal-fired power plants.

Description

technical field [0001] The invention is applied in the technical field of environmental catalytic purification, and relates to an ammonia selective reduction nitrogen oxide catalyst for the purpose of denitrification of coal-fired flue gas. Background technique [0002] Nitrogen oxide (NOx) is a major pollutant in today's air pollution. Its existence will cause major environmental problems such as photochemical smog, greenhouse effect, and acid rain, and cause great harm to the ecological environment and human health. How to effectively remove it NOx has become a key topic of environmental protection today. The emission of NOx in coal-fired flue gas is an important source of NOx in the atmosphere. At present, the more effective removal method is to use NH 3 Under the action of the catalyst, the reducing agent selectively reduces NOx to generate non-toxic N 2 , the law is abbreviated as NH 3 -SCR. [0003] in NH 3 - In the process of removing NOx by the SCR method, the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J21/06B01D53/56B01D53/86
Inventor 贺泓刘福东张长斌
Owner 江西中科鸿虔新材料有限公司
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