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Novel cerium oxide denitration catalyst and preparation method thereof

A technology of denitrification catalyst and cerium oxide, which is applied in the field of new cerium oxide denitrification catalyst and its preparation, can solve the problems of great impact on catalyst activity and life, pollution of human body and ecological environment, narrow applicable temperature range, etc., and achieve good alkali metal resistance Poisoning performance, good resistance to high airspeed, and the effect of reducing operating costs

Active Publication Date: 2014-07-23
江苏中创清源科技有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, there are still some problems in the actual use of this type of catalyst: first, the active component V 2 o 5 The precursor of the catalyst is very toxic, and it is easy to pollute the human body and the ecological environment; secondly, the catalyst system has a narrow applicable temperature range, and it is difficult to apply to industrial boilers / furnaces with low flue gas discharge temperature (<250°C); thirdly , the high content of fly ash and sulfur dioxide in the flue gas has a great influence on the activity and life of the catalyst
It has been reported in the literature that cerium oxide has better NH after sulfation 3 -SCR reaction activity, but its anti-sulfur performance and anti-alkali metal poisoning performance are poor, and there are no reports of cerium oxide catalysts with anti-sulfur and anti-alkali metal poisoning performance

Method used

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  • Novel cerium oxide denitration catalyst and preparation method thereof
  • Novel cerium oxide denitration catalyst and preparation method thereof
  • Novel cerium oxide denitration catalyst and preparation method thereof

Examples

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preparation example Construction

[0022] A preparation method of a cerium-based low-temperature denitration catalyst, comprising the following steps:

[0023] Step 1. Dissolve cerium sulfate, sodium phosphate and cerous sulfate in water of 10 times the mass at room temperature, and stir to form a transparent solution, wherein the content of cerium sulfate is 80% of the molar percentage of the catalyst, and the content of sodium phosphate is the molar percentage of the catalyst 5%, the balance is cerous sulfate;

[0024] Step 2. Transfer the solution prepared in step 1 to a hydrothermal reactor with a capacity of 100 mL, and add deionized water to 70% of the total volume of the hydrothermal reactor;

[0025] Step 3. Seal the hydrothermal reaction kettle in step 2 and transfer it to an oven to heat and react at 200° C. for 12 hours. After cooling down, centrifuge and wash with deionized water until the presence of sulfate groups cannot be detected;

[0026] Step 4. Dry the centrifuged precipitate in an oven at ...

Embodiment 2

[0030] A cerium-based low-temperature denitrification catalyst, the raw material components of which are: cerium sulfate with a content of 85% of the molar percentage of the catalyst, sodium phosphate with a content of 10% of the molar percentage of the catalyst, and a content of 10% of the molar percentage of the catalyst 5% cerium sulfate.

[0031] A preparation method of a cerium-based low-temperature denitration catalyst, comprising the following steps:

[0032] Step 1. Dissolve cerium sulfate, sodium phosphate and cerous sulfate in water of 20 times the mass at room temperature, and stir to form a transparent solution, wherein the content of cerium sulfate is 85% of the molar percentage of the catalyst, and the content of sodium phosphate is the molar percentage of the catalyst 10%, the balance is cerous sulfate;

[0033] Step 2. Transfer the solution prepared in step 1 to a hydrothermal reactor with a capacity of 100 mL, and add deionized water to 70% of the total volum...

Embodiment 1

[0038] The catalyst prepared in Example 1 was reacted when ammonia was used as a reducing agent: 500ppm of nitrogen monoxide (NO), 500ppm of ammonia (NH 3 ), 5% oxygen (O 2 ) mixed, and the rest of the reaction mixture is nitrogen (N 2 ), by installing 150mg of the composite oxide catalyst, the reaction space velocity is 70000h -1, in a wide temperature range (200-500 °C), the efficient and selective catalytic reduction of NO can be achieved.

[0039] 500ppm of nitric oxide (NO), 500ppm of ammonia (NH 3 ), 5% oxygen (O 2 ) mixed, and the rest of the reaction mixture is nitrogen (N 2 ), through the reaction tube equipped with 150mg of the composite oxide catalyst, the reaction space velocity is 250000h -1 , and the temperature range is 200-550 °C, the conversion rate of the catalyst prepared in this example to reduce nitrogen oxides is shown in the attached figure 1 .

[0040] from figure 1 It can be seen from the figure that the increase of space velocity has a signifi...

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Abstract

The invention discloses a novel cerium oxide denitration catalyst. The novel cerium oxide denitration catalyst has the expression formula of CeNaOx, wherein the molar ratio of Ce to Na is (90-98):(10-2), and x is balanced and determined by positive and negative valence electrons in each atom. The preparation method of the catalyst comprises the following steps of: 1, dissolving cerous sulfate, sodium phosphate and cerium sulfate in water at normal temperature, and stirring to form a transparent solution; 2, transferring the prepared solution into a hydrothermal reaction kettle, and adding deionized water; 3, sealing the hydrothermal reaction kettle and transferring the hydrothermal reaction kettle to an oven for heating and reacting, reducing the temperature, performing centrifugal separation, and cleaning until no sulfate radical is detected by using deionized water; and 4, drying and roasting the centrifuged precipitate, thereby obtaining the catalyst. The metallic oxide catalyst is in the range of 200-500 DEG C, and the purification efficiency of nitric oxide is 71-100 percent; and the composite oxide catalyst has high high-altitude-resistant speed and good alkali-resistant metal poisoning performance, the efficiency is greatly improved, and the operating cost can be obviously reduced.

Description

technical field [0001] The invention relates to a catalyst for treating nitrogen oxides in waste gas discharged from industrial boilers such as steel plants, glass kilns and cement plants, and in particular to a novel cerium oxide denitrification catalyst and a preparation method thereof. Background technique [0002] NO x (nitrogen oxides) is one of the main air pollutants in my country. With the rapid development of my country's economy, the growth of coal-based energy consumption and the rapid increase in the number of motor vehicles, the consumption of a large amount of fossil fuels has led to the emission of NO into the atmosphere. x Emissions increased rapidly. They not only cause environmental problems such as acid rain and photochemical smog, but also do great harm to human health. Therefore, how to effectively control nitrogen oxide emissions has become a very important issue in the development of my country's national economy. [0003] At present, ammonia selec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01D53/90B01D53/56
Inventor 李俊华常化振王驰中郝吉明
Owner 江苏中创清源科技有限公司
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