Sulfur-resistant and water-resistant low-temperature denitration composite molecular sieve catalyst and preparation method thereof

A composite molecular sieve and low-temperature denitrification technology, which is applied in the field of low-temperature denitrification composite molecular sieve catalyst and its preparation, can solve the problems of unfavorable ecological environment and human health, the toxicity of active component vanadium, and the space behind the large furnace, etc., and achieve low activation temperature , wide temperature window, and the effect of widening the temperature window

Active Publication Date: 2017-09-22
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, requires a large space behind the furnace; second, the vanadium in the active component is toxic, which is not good for the ecological environment and human health; in addition, equipment such as sintering machines and pellets in steel plants The flue gas temperature 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 with high sulfur resistance performance

Method used

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  • Sulfur-resistant and water-resistant low-temperature denitration composite molecular sieve catalyst and preparation method thereof
  • Sulfur-resistant and water-resistant low-temperature denitration composite molecular sieve catalyst and preparation method thereof
  • Sulfur-resistant and water-resistant low-temperature denitration composite molecular sieve catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (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 together in a blast drying oven at 100°C for 25 minutes for later use;

[0026] (2) Weigh 0.3775gCu(NO 3 ) 2 ·3H 2 O powder was dissolved in 30ml of deionized water, and after fully stirring evenly, 2.7412g of manganese nitrate solution with a concentration of 50% was added, and fully stirred to form a mixed solution containing two active components in different proportions.

[0027] (3) Take 5 g of the dried H-SAPO-34 molecular sieve former powder in step (1) and dissolve in the mixed solution prepared in step (2), and stir continuously for 8 hours in a water bath at 30° C. and a magnetic stirrer, fully After impregnation, heat it up to 75°C and continue stirring and impregnating for 2h. After the water is evaporated to dryness, put the evaporative crystallized product in an oven and dry it at 100°C for 8h, and then put it in a tube furnace....

Embodiment 2

[0030] (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 together in a blast drying oven at 103°C for 30 minutes for later use;

[0031] (2) Weigh 0.3775g Cu(NO 3 ) 2 ·3H 2 O powder, be dissolved in the deionized water of 35ml, after fully stirring, add 0.9091g concentration and be the manganese nitrate solution of 50% and 0.1549g Ce(NO 3 ) 3 ·6H 2 O powder, fully stirred to make a mixed solution containing two active components and cerium-containing additives in different proportions.

[0032] (3) Take 5 g of the dried H-SAPO-34 molecular sieve former powder in step (1) and dissolve in the mixed solution prepared in step (2), and stir continuously for 6 hours in a water bath at 20° C. and a magnetic stirrer, fully After impregnation, heat it up to 85°C and continue to stir and impregnate for 4h. After the water is evaporated to dryness, put the evaporated and crystallized product in an oven and d...

Embodiment 3

[0035] (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 together in a blast drying oven at 105°C for 30 minutes for later use;

[0036] (2) Weigh 0.3775g Cu(NO 3 ) 2 ·3H 2 O powder, dissolved in 40ml of deionized water, after fully stirring evenly, adding 2.7412g concentration of 50% manganese nitrate solution and 0.3099g Ce(NO 3 ) 3 ·6H 2 O powder, fully stirred to make a mixed solution containing two active components and cerium-containing additives in different proportions.

[0037] (3) Take 5 g of the dried H-SAPO-34 molecular sieve former powder in step (1) and dissolve in the mixed solution prepared in step (2), and stir continuously for 6 hours in a water bath at 20° C. and a magnetic stirrer, fully After impregnation, heat it up to 85°C and continue to stir and impregnate for 4h. After the water is evaporated to dryness, put the evaporated and crystallized product in an oven and dry it at...

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Abstract

The invention relates to a sulfur-resistant and water-resistant low-temperature denitration composite molecular sieve catalyst and a preparation method thereof. The catalyst is prepared by an impregnation method, a chabasite molecular sieve H-SAPO-34 serves as a support, an active component is a composite oxide of transition metal Cu and Mn, an additive is one of Ce, Fe, Co, Mo and Cr, the supported weight of a copper element and a manganese element in the active component is 2%-10% in weight percentage, and the supported weight of additive is 1-10% in weight percentage. Compared with a Cu or Mn-based catalyst of a single component, the denitration composite molecular sieve catalyst remarkably improves denitration efficiency and heat stability by the aid of multi-metal synergistic effect, an active temperature window of the catalyst is effectively widened, and the catalyst has good sulfur resistance.

Description

technical field [0001] The invention relates to a sulfur-resistant and water-resistant low-temperature denitrification composite molecular sieve catalyst and a preparation method thereof, belonging to the fields of air pollution control technology and environmental protection catalytic materials. Background technique [0002] my country's energy structure determines that our country is a large coal-burning country. With the rapid development of our national economy, a large amount of nitrogen oxides are emitted into the atmosphere every year, resulting in acid rain, smog, and tiny particle pollution in many areas, which are harmful to the human body. , environment, ecological hazards and damage to the social economy are very 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 were 12.1 million tons in 2000, and reached 23.38 million t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J29/85B01J2229/18
Inventor 沈德魁何鹏飞刘国富张文杰
Owner SOUTHEAST UNIV
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