Porous carbon material supported zero-valent Fe-Fe3C denitration catalyst as well as preparation method and application method thereof

A denitrification catalyst, fe-fe3c technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems that are difficult to apply to coke oven flue gas denitrification, so as to avoid catalyst deactivation, reduce costs, The effect of improving the safety of use

Active Publication Date: 2019-03-08
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the medium and low temperature SCR denitrification technology is also difficult to apply to the coke oven flue gas denitrification industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The porous carbon material loaded with zero-valent Fe-Fe 3 The preparation method of the denitration catalyst of C, comprises the steps:

[0023] 1) Dry the sawdust in a blast drying oven at 100-110°C for more than 12 hours, and keep it sealed for later use;

[0024] 2) In 5~10g solid Fe(NO 3 ) 3 9H 2 Add 50-100ml deionized water to O to mix and dissolve, stir to form a transparent solution, the concentration of the solution is 0.1-0.4mol / L;

[0025] 3) Slowly add the dried sawdust in step 1) to the transparent solution prepared in step 2), stir evenly for more than 10 minutes, and stand at room temperature for 12 to 16 hours to prepare a slurry;

[0026] 4) Dry the slurry obtained in step 3) in a blast drying oven at 100-110° C. for more than 12 hours, then put it into a tubular reactor, and put the tubular reactor containing the slurry into a crucible furnace, Raise the temperature to 600-800°C under a nitrogen atmosphere and keep it warm for more than 30 minutes...

Embodiment 1

[0031] In this example, Fe-Fe 3 The preparation steps of C / C denitration catalyst are as follows:

[0032] Step 1), dry the sawdust in a blast drying oven at 105°C for 12 hours, and seal and store for later use;

[0033] Step 2), at 7.214g solid Fe(NO 3 ) 3 9H 2 Add 75ml of deionized water into O, mix and dissolve, stir to form a transparent solution, and the solution concentration is 0.239mol / L;

[0034] Step 3), slowly adding the sawdust in step 2) to the transparent solution obtained in step 2), stirring evenly for 10 min, and standing at room temperature for 12 h.

[0035] In step 4), the slurry obtained in step 3) was dried in a blast oven at 105°C for 12 hours, and then put into a crucible furnace together with the tubular reactor, heated to 750°C under a nitrogen atmosphere, and kept for 30 minutes to obtain Fe -Fe 3 C / C denitrification catalyst.

[0036] The simulated flue gas denitrification test shows that at a space velocity of 6000h -1 , NO volume concentra...

Embodiment 2

[0038] In this example, Fe-Fe 3 The preparation steps of C / C denitration catalyst are as follows:

[0039] Step 1), dry the sawdust in a blast drying oven at 105°C for 12 hours, and seal and store for later use;

[0040] Step 2), at 8.514g solid Fe(NO 3 ) 3 9H 2 Add 75ml deionized water in O to mix and dissolve, stir to form a transparent solution, and the solution concentration is 0.319mol / L;

[0041] Step 3), slowly adding the sawdust in step 2) to the transparent solution obtained in step 2), stirring evenly for 10 min, and standing at room temperature for 12 h.

[0042] Step 4), dry the slurry obtained in step 3) in a 105°C blast oven for 12h, then put it into a crucible furnace together with the tubular reactor, raise the temperature to 650°C under a nitrogen atmosphere, and keep it warm for 30min to obtain Fe -Fe 3 C / C denitrification catalyst.

[0043] The simulated flue gas denitrification test shows that at a space velocity of 6000h -1 , NO volume concentratio...

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Abstract

The invention relates to a porous carbon material supported zero-valent Fe-Fe3C denitration catalyst as well as a preparation method and an application method thereof. The denitration catalyst is a Fe-Fe3C/C denitration catalyst and is prepared from components in percentage by mass as follows: 5%-15% of zero-valent Fe, 5%-10% of Fe3C and 75%-90% of C; zero-valent Fe and Fe3C are taken as active components; C is porous carbon and taken as a carrier and a reductant. The Fe-Fe3C/C denitration catalyst has simple preparation process, low cost and high low-temperature activity, which is matched with the temperature window of exhaust gas discharged from a flue of a coke oven. The low-valent Fe is used for direct catalytic reduction of NO, harm to human bodies and environment caused by ammonia escape and toxic vanadium contained in conventional denitration catalysts is avoided, and the problem of carbon loss in the process of direct denitration of carbon solid is solved.

Description

technical field [0001] The invention relates to the technical field of catalytic purification of coke oven flue gas, in particular to a porous carbon material loaded with zero-valent Fe-Fe 3 C denitration catalyst and its preparation and use methods. Background technique [0002] Nitrogen oxides (NO X ) is an important cause of forming acid rain, destroying the ozone layer, and causing photochemical smog, causing serious harm to human health and the ecological environment, and has become the main factor restricting the sustainable development of my country's economic society. my country is the world's largest coal producer and consumer, and the NO emitted into the atmosphere every year X Pollutants such as pollutants are also high in the forefront of the world. Especially in recent years, with the formation and spread of large-scale smog weather across the country, how to effectively control the NOx formed in the process of coal utilization X Pollutants such as pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01D53/56B01D53/86
CPCB01D53/8628B01J27/22B01D2258/0283
Inventor 李先春李艳鹰何超
Owner UNIV OF SCI & TECH LIAONING
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