Cu-Mn bimetallic composite type low-temperature denitration catalyst and preparation method thereof

A low-temperature denitrification and catalyst technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of large furnace space, high price, catalyst poisoning, etc., to reduce the denitrification reaction temperature and increase heat Effect of Stability, Wide Temperature Window

Inactive Publication Date: 2016-08-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of flue gas denitrification, NH 3 As the selective catalytic reduction (SCR) process of the reducing agent, the commercially used catalyst is mainly V 2 o 5 -WO 3 / TiO 2 series, the operating temperature of the catalyst is 300 ° C ~ 420 ° C, and the price is expensive
In order to meet the temperature requirements, the catalytic bed is generally arranged before the dust collector, but on the one hand, this arrangement method will cause the SO of the catalyst 2 Poisoning and dust blockage, on the other hand, require a large space behind the furnace; second, the vanadium (V) in the active component is toxic, which is not good for the ecological environment and human health; in addition, such as sintering machines and pellets in steel plants The temperature of the flue gas emitted by the equipment is below 200 °C, which is not within the active temperature window range of such medium and high temperature SCR catalysts. Therefore, it is of great significance to vigorously develop low temperature SCR technology

Method used

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  • Cu-Mn bimetallic composite type low-temperature denitration catalyst and preparation method thereof
  • Cu-Mn bimetallic composite type low-temperature denitration catalyst and preparation method thereof
  • Cu-Mn bimetallic composite type low-temperature denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weigh 8g of the original powder of chabazite molecular sieve (H-SAPO-34), put it into an ark made of corundum, and place it in a blast drying oven at 105°C for 30 minutes for use;

[0021] (2) Weigh 0.3775gCu(NO 3 ) 2 ·3H 2 The O powder was dissolved in deionized water, and after stirring well, 0.6507g of 50% manganese nitrate solution was added and stirred well to prepare a solution containing two active components in different proportions.

[0022] (3) Take 5 g of the original H-SAPO-34 molecular sieve powder dried in step (1) and dissolve it in the saturated solution prepared in step (2), and use a water bath at 20°C and a magnetic stirrer at a rotation speed of 40~ Stir at 50r / s for 6h. After full immersion, heat it up to 85℃ and continue to stir and immerse for 4h. After the water evaporates, put the evaporated and crystallized product in an oven and dry it at 80℃ for 12h, and then place it in a tube In the furnace, calcine in a high temperature aerobic environment ...

Embodiment 2

[0025] (1) Weigh 8g of the original powder of chabazite molecular sieve H-SAPO-34, put it in an ark made of corundum, and place it in a blast drying oven at 105°C for 30 minutes for use;

[0026] (2) Weigh 0.3775g Cu(NO 3 ) 2 ·3H 2 The O powder was dissolved in deionized water, and after fully stirring it evenly, 1.3015 g of 50% manganese nitrate solution was added and fully stirred to prepare a saturated solution containing two active components in different proportions.

[0027] (3) Take 5 g of the original H-SAPO-34 molecular sieve powder dried in step (1) and dissolve it in the saturated solution prepared in step (2), and use a water bath at 20°C and a magnetic stirrer at a rotation speed of 40~ Stir at 50r / s for 6h. After full immersion, heat it up to 85℃ and continue to stir and immerse for 4h. After the water evaporates, put the evaporated and crystallized product in an oven and dry it at 80℃ for 12h, and then place it in a tube In the furnace, calcine in a high temperature ...

Embodiment 3

[0030] (1) Weigh 8g of the original powder of chabazite molecular sieve H-SAPO-34, put it in an ark made of corundum, and place it in a blast drying oven at 105°C for 30 minutes for use;

[0031] (2) Weigh 0.3775g Cu(NO 3 ) 2 ·3H 2 The O powder was dissolved in deionized water, and after fully stirring, 1.9522g of 50% manganese nitrate solution was added, and fully stirred to prepare a saturated solution containing two active components in different proportions.

[0032] (3) Take 5 g of the original H-SAPO-34 molecular sieve powder dried in step (1) and dissolve it in the saturated solution prepared in step (2), and use a water bath at 20°C and a magnetic stirrer at a rotation speed of 40~ Stir at 50r / s for 6h. After full immersion, heat it up to 85℃ and continue stirring and immersion for 4h. After the water evaporates, put the evaporated and crystallized product in an oven and dry it at 80℃ for 12h, and then put it in the tube In the furnace, calcine in a high temperature aerobic...

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Abstract

The invention discloses a Cu-Mn bimetal composite low-temperature denitrification catalyst and a preparation method thereof. The catalyst is prepared by an impregnation method. Chabazite molecular sieve H-SAPO-34 is used as a carrier, and the active component is a composite oxide of transition metals Cu and Mn, wherein, in terms of mass percentage, the active components Cu and Mn are 2-10% respectively. Compared with single-component Cu or Mn-based catalysts, the SCR catalyst of the invention uses bimetallic synergy to significantly improve the denitrification efficiency and thermal stability of the catalyst, and effectively widen its active temperature window; at 180~350 The conversion rate of NO can reach more than 90% within ℃.

Description

Technical field [0001] The present invention relates to SCR (Selective Catalytic Reduction) flue gas denitration technology, in particular to an NH 3 A catalyst for low-temperature SCR denitration as a reducing agent and a preparation method thereof belong to the field of air pollution control technology and environmental protection catalytic materials. Background technique [0002] my country’s energy structure determines that my country is a large coal-burning country. With the rapid development of my country’s national economy, a large amount of nitrogen oxides are emitted into the atmosphere every year, resulting in acid rain, smog, and micro-particle pollution in many areas. The damage to the environment and ecology, as well as the damage to the society and economy are huge. In recent years, my country's nitrogen oxide emissions have grown rapidly. According to data released by the environmental protection department, my country's total nitrogen oxide emissions in 2000 were 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85
CPCB01J29/85B01J35/0093B01J2229/18
Inventor 沈德魁何鹏飞肖睿
Owner SOUTHEAST UNIV
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