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Catalyst for denitration of low-temperature and low-oxygen flue gas as well as preparation method and application of catalyst

A catalyst, low-temperature technology, applied in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as low efficiency, concentrated precipitation of urea recrystallization, and failure to achieve loading effect.

Pending Publication Date: 2021-10-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficiency of drying and loading urea after ordinary impregnation is very low. When the catalyst is left to dry, urea recrystallization will be concentrated and precipitated, and the actual loading effect cannot be achieved.

Method used

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  • Catalyst for denitration of low-temperature and low-oxygen flue gas as well as preparation method and application of catalyst
  • Catalyst for denitration of low-temperature and low-oxygen flue gas as well as preparation method and application of catalyst
  • Catalyst for denitration of low-temperature and low-oxygen flue gas as well as preparation method and application of catalyst

Examples

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preparation example Construction

[0031] A preparation method of a urea-doped bimetallic catalyst, comprising the following steps:

[0032] Step 1, add manganese nitrate aqueous solution, ferric nitrate aqueous solution and deionized water dropwise to the SBA-15 molecular sieve carrier successively, stir to make them fully mixed, and obtain a mixed solution; wherein, the mass concentration of the manganese nitrate aqueous solution is 5 ~ 50g / L ; The mass concentration of ferric nitrate aqueous solution is 1~20g / L;

[0033] It is optimal when the concentration of manganese nitrate aqueous solution is 20g / L, and optimal when the concentration of ferric nitrate aqueous solution is 10g / L.

[0034] In step 2, the mixed solution obtained in step 1 is left to age until the active component is fully adsorbed on the surface of the carrier to obtain a system, and then the obtained system is dried in an oven to obtain a powder.

[0035] Step 3, roasting the powder obtained in step 2 to obtain a MnFe / SBA-15 system; where...

Embodiment 1

[0045] A preparation method of a urea-doped bimetallic catalyst, comprising the following steps:

[0046] Step 1, take by weighing 1g SBA-15 molecular sieve carrier, 16.25mL mass concentration be the manganese nitrate solution of 20g / L, 2.42mL mass concentration be the ferric nitrate solution of 10g / L and 50mL water;

[0047] Step 2, add manganese nitrate aqueous solution, ferric nitrate aqueous solution and water to the weighed SBA-15 molecular sieve carrier successively, stir fully at 40°C for 1h, then let it stand for 24h; then place it in a vacuum oven at 60°C Drying is carried out to obtain a powder.

[0048] Step 3, calcining the powder obtained in step 2 in a muffle furnace at 500° C. for 4 hours to obtain a MnFe / SBA-15 catalyst.

[0049] Step 4, weigh 1g of MnFe / SBA-15 catalyst, slowly add 15mL of urea (urea) solution with a concentration of 10g / L dropwise, stir well and let stand for 6h; then put it in an oven at 50°C to dry to obtain urea- MnFe / SBA-15 catalyst. Th...

Embodiment 2

[0052] A preparation method of a urea-doped bimetallic catalyst, comprising the following steps:

[0053] Step 1, take by weighing 1g SBA-15 molecular sieve carrier, 16.25mL mass concentration be the manganese nitrate solution of 20g / L, 2.42mL mass concentration be the ferric nitrate solution of 10g / L and 50mL water;

[0054] Step 2, add manganese nitrate aqueous solution, ferric nitrate aqueous solution and water to the weighed SBA-15 molecular sieve carrier successively, stir fully at 40°C for 1h, then let it stand for 24h; then place it in a vacuum oven at 60°C Drying is carried out to obtain a powder.

[0055] Step 3, calcining the powder obtained in step 2 in a muffle furnace at 500° C. for 4 hours to obtain a MnFe / SBA-15 catalyst.

[0056] Step 4, weigh 1g of MnFe / SBA-15 catalyst, slowly add 15mL of urea (urea) solution with a concentration of 10g / L dropwise, stir well and let stand for 6h; then put it in an oven at 50°C to dry to obtain urea- MnFe / SBA-15 catalyst. Th...

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Abstract

The invention provides a catalyst for denitration of low-temperature and low-oxygen tail gas as well as a preparation method and application of the catalyst. The catalyst takes an SBA-15 molecular sieve as a carrier and a ferromanganese oxide as an active component and adsorbs urea at the same time, so that a urea-MnFe / SBA-15 catalyst is obtained; and the invention further discloses a preparation method and application of the low-temperature low-oxygen tail gas denitration catalyst. During application, the catalyst is combined with low-temperature plasma, the quartz wool and the catalyst are uniformly mixed and then fixed in a reactor, and the bed pressure drop is reduced; and the urea is used as a reducing agent to be introduced into the catalyst to directly participate in reaction, and plasma bombardment reaction gas is matched to provide high-energy active species, so that the reaction temperature is reduced, and efficient removal of NO in a low-temperature and low-oxygen environment is realized. The whole denitration process is green and environment-friendly, and the catalyst has no secondary pollution and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of catalytic reaction technology, and relates to a catalyst for low-temperature low-oxygen tail gas denitrification, a preparation method and an application thereof. Background technique [0002] Nitrogen oxides (NO>90%), as one of the main harmful gases in air pollution, pose a serious threat to the environment and human health, and must be properly dealt with. Among numerous NO gas denitrification technologies, selective catalytic reduction (SCR) is widely used in industry due to its high denitrification efficiency. The reducing agents commonly used in selective catalytic reduction denitrification reactions are ammonia and urea. [0003] For the relatively mature SCR technology that uses ammonia as the reducing agent, the reaction window temperature is 300-450°C, but the flue gas discharge temperature is low, and the flue gas needs to be reheated to carry out the NH3-SCR reaction. Therefore, at low temperature (...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J37/02B01D53/56B01D53/86B01D53/44
CPCB01J29/0341B01J37/0201B01D53/8628B01D53/8687B01J2229/186B01D2257/404B01D2257/708B01D2251/2067
Inventor 齐随涛谭潇
Owner XI AN JIAOTONG UNIV
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