Denitration catalyst of wide activity temperature window as well as preparation method and application thereof

A technology of active temperature window and denitrification catalyst, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the flue gas conditions and precursors of catalysts with low denitrification performance and cannot be applied to low-load operation of power plant boilers High toxicity and other problems, to achieve the effect of widening the active temperature window and improving low-temperature denitrification performance

Active Publication Date: 2014-11-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this catalyst is that the active component V 2 o 5 The precursor of the catalyst is highly toxic and likely to cause environmental pollution; and when the flue gas temperature is lower than 300 ° C, the denitrification performance of the catalyst is low
Existing SCR catalysts at home and abroad cannot be applied to the flue gas conditions of low-load operation of power plant boilers

Method used

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  • Denitration catalyst of wide activity temperature window as well as preparation method and application thereof
  • Denitration catalyst of wide activity temperature window as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Cu 0.1 Ce 0.1 Ti 0.8 o 2 Preparation of composite oxide catalyst

[0018] a) Take 7.53 ml of 0.50 mol / L copper nitrate solution, 7.49 ml of 0.50 mol / L cerium nitrate solution and 15.03 ml of 2 mol / L titanium sulfate solution, stir and mix in a water bath at 30°C for 30 minutes to obtain a mixed solution;

[0019] b) Add ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 10, transfer the obtained mixed solution to a hydrothermal reaction kettle, perform a hydrothermal reaction at 120° C. for 24 hours, and then lower it to room temperature;

[0020] c) The reaction solution obtained in step b) was suction-filtered, washed, dried at 120°C for 12 hours, and then calcined in a muffle furnace at 500°C for 6 hours to prepare a copper-cerium-titanium composite oxide catalyst.

Embodiment 2

[0021] Example 2: Cu 0.1 Ce 0.3 Ti 0.6 o 2 Preparation of composite oxide catalyst

[0022] a) Take 3.77 ml of 1.0 mol / L copper nitrate solution, 11.31 ml of 1.0 mol / L cerium nitrate solution and 22.62 ml of 1.0 mol / L titanium sulfate solution, stir and mix in a water bath at 50°C for 90 minutes to obtain a mixed solution;

[0023] b) adding ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 10, transferring the obtained mixed solution to a hydrothermal reaction kettle, performing a hydrothermal reaction at 120° C. for 12 hours, and then cooling down to room temperature;

[0024] c) The reaction solution obtained in step b) was suction filtered, washed, dried at 120°C for 24 hours, and then calcined in a muffle furnace at 500°C for 4 hours to prepare a copper-cerium-titanium composite oxide catalyst.

Embodiment 3

[0025] Example 3: Cu 0.2 Ce 0.2 Ti 0.6 o 2 Preparation of composite oxide catalyst

[0026] a) Take 7.53 ml of 1.0 mol / L copper nitrate solution, 7.49 ml of 1.0 mol / L cerium nitrate solution and 11.27 ml of 2 mol / L titanium sulfate solution, stir and mix in a water bath at 30°C for 60 minutes to obtain a mixed solution;

[0027] b) Add ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 10, transfer the obtained mixed solution to a hydrothermal reaction kettle, perform a hydrothermal reaction at 120° C. for 24 hours, and then lower it to room temperature;

[0028] c) The reaction solution obtained in step b) was suction-filtered, washed, dried at 120°C for 48 hours, and then calcined in a muffle furnace at 500°C for 8 hours to prepare a copper-cerium-titanium composite oxide catalyst.

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Abstract

The invention provides a denitration catalyst of a wide activity temperature window as well as a preparation method and application of the denitration catalyst, and belongs to the technical fields of environment catalysis and atmosphere pollution control. The composite oxide catalyst is prepared by a hydrothermal method. The denitration catalyst is characterized in that the activity temperature window is wide and has good waterproof property and good sulfur tolerance. The provided method for reducing nitric oxide comprises the following steps of: loading the catalyst in a reactor of a stationary bed; controlling the reaction temperature within the range of 150-400 DEG C; and using ammonia as a reducing agent. According to the copper-cerium-titanium composite oxide prepared by the invention, the air speed is 64000 / h; and the purification efficiency of the nitric oxide is 91-99% within the range of 200-400 DEG C.

Description

technical field [0001] The invention relates to a composite oxide catalyst, its preparation and a method for selectively catalytically reducing nitrogen oxides under oxygen-enriched conditions by using the catalyst. It is suitable for stationary sources such as coal-fired power plants, industrial boilers, and calcination kilns, and mobile sources such as lean-burn gasoline vehicles and diesel vehicles to emit nitrogen oxides (NO x ) and belongs to the technical field of environmental catalysis and air pollution control. Background technique [0002] With the growth of energy consumption and the increase of the number of motor vehicles, a large amount of fossil fuels are consumed, and the emission of nitrogen oxides continues to increase. The problems such as acid rain and photochemical smog caused by them have become increasingly prominent global environmental problems. Therefore, NO x Emission control has become a research hotspot in the field of atmospheric environmental ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/56
Inventor 刘志明易扬张绍轩朱珺之
Owner BEIJING UNIV OF CHEM TECH
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