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Preparation method for lignite semi-coke-based denitration agent used for low-temperature catalytic oxidation

A technology for lignite semi-coke and low-temperature catalysis is applied in the field of preparation of catalytic oxidation denitrification agents, which can solve the problems of inability to meet industrial application requirements, inability to directly utilize raw coal, and low denitration efficiency, and achieves no secondary pollution in the process and is easy to popularize and use. , the effect of operating costs

Inactive Publication Date: 2017-01-11
YUNNAN MINZU UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN 101920211A discloses a method for preparing a semi-coke flue gas denitrification agent for low-temperature catalytic oxidation. Catalytic oxidation at 30~130℃. However, this method cannot directly use raw coal as raw material, and requires secondary activation of semi-coke, which is complicated to operate. The prepared semi-coke is a large-particle flue gas denitrification product, which is generally used in large-scale stationary bed or mobile bed unit
This method uses raw coal as raw material to reduce costs, and only needs to further activate lignite semi-coke. The operation is simple, but its denitrification efficiency is low, only 10-60%, which cannot meet the needs of industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take an appropriate amount of lignite, wash it three times with distilled water, and dry it at 100°C for 2 hours; put the dried lignite under N 2 Under the atmosphere, roast at a certain temperature for 2 hours to obtain lignite semi-coke; after grinding and sieving, the particle size is 40-60 mesh.

[0032] Take 2g lignite semi-coke and place it on the quartz sand core in the fixed bed reactor, set the flow rate to 200ml / min, 0.05%NO, 3%O 2 、96.95%N 2 The mixed gas is passed into the reactor and heated to 100°C with a space velocity of 3000h -1 , to oxidize NO in the mixture to NO 2 , and then the gas enters the ammonia water absorption bottle, and the ammonium nitrate product obtained can be used as a fertilizer raw material. The final NO removal rate is shown in Table 1.

[0033] Table 1 Effect of different carbonization temperatures on NO removal rate.

[0034] Carbonization temperature °C 450 500 550 600 650 NO removal rate% 37 40 44 47 ...

Embodiment 2

[0036] Take an appropriate amount of lignite, wash it with distilled water for 3 times, and dry it at 100°C for 12 hours; roast the dried lignite at 650°C for 2 hours in an N2 atmosphere to obtain lignite semi-coke; grind and sieve to obtain granules The diameter is 40-60 mesh.

[0037] Boil 2.0g of 40-mesh lignite semi-coke in 0.5mol / L KOH solution for 1 hour, the volume ratio of lignite semi-coke and KOH solution is 1:50, cool, and then wash with deionized water until neutral, at 110°C Dry at 10h.

[0038] Take 1.5g KOH-modified lignite semi-coke and place it on the quartz sand core in the fixed bed reactor, set the flow rate to 200ml / min, 0.05%NO, 3%O2, 96.95%N 2 The mixed gas is passed into the reactor with a space velocity of 3000h-1, so that the NO in the mixed gas is oxidized to NO 2 , and then the gas enters the ammonia water absorption bottle, and the ammonium nitrate product obtained can be used as a fertilizer raw material. The final NO removal rate is shown in Ta...

Embodiment 3

[0042] Take an appropriate amount of lignite, wash it three times with distilled water, and dry it at 100°C for 12 hours; put the dried lignite under N 2 Under an atmosphere of 650 ° C for 2 h, lignite semi-coke is obtained; after grinding and sieving, the particle size is 40-60 mesh.

[0043] Put 2.0g of lignite semi-coke in 1mol / L alkali metal solution and boil for 1h, the volume ratio of lignite semi-coke and alkali metal solution is 1:70, cool, then wash with deionized water to pH=6.0, filter at 120°C Dry for 10 h.

[0044] Take 1g of the modified lignite semi-coke denitrification agent and place it on the quartz sand core in the fixed bed reactor, the flow rate is 200ml / min, 0.05%NO, 3%O 2 、96.95%N 2 The mixed gas is passed into the reactor and heated to 100°C with a space velocity of 4000h -1 , to oxidize NO in the mixture to NO 2 , and then the gas enters the ammonia water absorption bottle, and the ammonium nitrate product obtained can be used as a fertilizer raw mat...

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Abstract

The invention discloses a preparation method for a lignite semi-coke-based denitration agent used for low-temperature catalytic oxidation. The method prepares lignite semi-coke through high-temperature carbonization; then the lignite semi-coke is used as a carrier, and an alkaline substance and metal oxide are loaded as active components for modification; and ultrasonic equal impregnation is carried out to prepare the modified lignite semi-coke-based catalyst. The catalyst allows the conversion rate of NO to NO2 under catalytic oxidation to reach 87% at a reaction temperature of 100 DEG G; the catalyst has low catalytic activity and can be used for removing NO from a low-temperature emission source of aerobic waste gas; the method has the advantages of simple process, convenient operation, low operation cost, no need for high temperature and no use of an oxidant; and the catalyst prepared by the using the method has a high NO removal rate.

Description

technical field [0001] The invention relates to a preparation method of catalytic oxidation denitrification agent at low temperature, in particular to a preparation method of active semi-coke denitrification agent from lignite, which belongs to the technical field of material preparation and air pollution purification. Background technique [0002] With the development of modern industry and the increasing number of automobiles, air pollution has become an increasingly serious global problem. Nitrogen oxides, as one of the main pollutants in the atmosphere, will cause photochemical smog, acid rain, ozone hole and other environmental problems that affect the sustainable development of human beings. Exhaust gas from stationary sources such as thermal power plants and other industrial combustion devices is one of the main sources of nitrogen oxides in the atmosphere, of which NO accounts for 90% to 95% of the total nitrogen oxides. [0003] Currently, NH 3 The selective catal...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J23/34B01J23/06B01J23/04B01D53/90B01D53/56
Inventor 王访刘天成贾丽娟宁平王博涛
Owner YUNNAN MINZU UNIV
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