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Composite carrier SCR denitration catalyst and preparation method thereof

A technology of denitration catalyst and composite carrier, which is applied in the field of composite carrier SCR denitration catalyst and its preparation, can solve the problems of inability to meet the denitration requirements of industrial furnaces and kilns, high content of poisoning elements, and high ash content, and achieves increased specific surface area, adsorption and adsorption. The effect of enhanced capacity and high denitration efficiency

Inactive Publication Date: 2018-02-16
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The denitrification catalysts used in coal-fired power plants have been commercially used for many years, and the technology is relatively mature. However, the flue gas conditions of coking, cement, glass and other industrial furnaces are quite different from those of coal-fired power plants, with low smoke temperature and high ash content. , high content of poisoning elements, etc., the current commercial denitrification catalysts cannot meet the denitrification needs of industrial furnaces and kilns

Method used

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  • Composite carrier SCR denitration catalyst and preparation method thereof
  • Composite carrier SCR denitration catalyst and preparation method thereof
  • Composite carrier SCR denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Sample performance: specific surface area 115m 2 / g, abrasion resistance 47mg / 100U.

[0053] Catalyst denitration performance test: the reaction temperature is 160℃~420℃, and the flue gas components are NO (500ppm), NH 3 (500ppm), O 2 (5%), carrier gas is N 2 , the airspeed is 10000h -1 , in this reaction temperature range, the catalyst denitration efficiency is stable above 93%, N 2 The selectivity is greater than 95%.

[0054] Catalyst sulfur and water resistance performance test: On the basis of the denitration performance test conditions, 1000ppm SO2 and 10% water vapor were continuously fed for 24 hours, and other test conditions remained unchanged. Within this reaction temperature range, the catalyst denitration efficiency was stable at more than 91%, N 2 The selectivity is greater than 90%.

[0055] Catalyst resistance to alkaline earth metal poisoning performance test: 500 μmol / g of Ca was loaded on the catalyst by impregnation method 2+ , calcined at 400...

Embodiment 2

[0057] Sample performance: specific surface area 128m 2 / g, abrasion resistance 39mg / 100U.

[0058] Catalyst denitration performance test: the reaction temperature is 160℃~420℃, and the flue gas components are NO (500ppm), NH 3 (500ppm), O 2 (5%), carrier gas is N 2 , the airspeed is 10000h -1 , in this reaction temperature range, the catalyst denitration efficiency is stable above 96%, N 2 The selectivity is greater than 95%.

[0059] Catalyst sulfur resistance and water resistance performance test: On the basis of the denitration performance test conditions, 1000ppm SO2 and 10% steam were continuously fed for 24 hours, and other test conditions remained unchanged. Within this reaction temperature range, the catalyst denitration efficiency was stable at more than 92%, N 2 The selectivity is greater than 91%.

[0060] Catalyst resistance to alkaline earth metal poisoning performance test: 800 μmol / g K was loaded on the catalyst by impregnation method + , calcined at 400 °...

Embodiment 3

[0062] Sample performance: specific surface area 109m 2 / g, abrasion resistance 28mg / 100U.

[0063] Catalyst denitration performance test: the reaction temperature is 160℃~420℃, and the flue gas components are NO (500ppm), NH 3 (500ppm), O 2 (5%), carrier gas is N 2 , the airspeed is 10000h -1 , in this reaction temperature range, the catalyst denitration efficiency is stable above 97%, N 2 The selectivity is greater than 95%.

[0064] Catalyst sulfur resistance and water resistance performance test: On the basis of the denitration performance test conditions, 1000ppm SO2 and 10% water vapor were continuously fed for 24 hours, and other test conditions remained unchanged. Within this reaction temperature range, the catalyst denitration efficiency was stable above 90%, N 2 The selectivity is greater than 95%.

[0065] Catalyst resistance to alkaline earth metal poisoning performance test: 1000 μmol / g Na was loaded on the catalyst by impregnation method + , calcined at 40...

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Abstract

The present invention discloses a composite carrier SCR denitration catalyst which comprises a composite carrier, an active component, an auxiliary agent and a lubricant with a certain mass ratio; thecomposite carrier is a mixture of anatase type nano titanium dioxide and metal ion-modified attapulgite, and the activity component is vanadium pentoxide. By acidizing the attapulgite, the specific surface area is increased, the active sites are increased, and the adsorption capacity of easily poisoned elements in the flue gas is enhanced, so that the catalyst has better anti-poisoning ability. The metal ion-modified attapulgite and the nano titanium dioxide are used as a catalyst carrier, so that the catalyst reaction temperature range is broadened to 160 DEG C-420 DEG C, and in the temperature range, the catalyst is high in denitrification efficiency, good in stability and good in selectivity, and can be used for various types of industrial furnace denitrification. By taking attapulgiteas a main material, the cost of production is effectively reduced. The nano titanium dioxide particles can be packed into gaps of the attapulgite skeleton, thereby enabling the catalyst to be strongin structure stability, uneasy to crack after calcination at a high temperature and high in wear resistance.

Description

technical field [0001] The invention relates to a composite carrier SCR denitration catalyst and a preparation method thereof, and belongs to the field of novel high-efficiency catalysts and prevention and control of air pollutants. Background technique [0002] Nitrogen oxides pollute the environment very seriously. Nitrogen oxides are not only the basis of nitric acid rain, but also one of the main substances that form photochemical smog and destroy the ozone layer. Nitrogen oxides are also highly toxic and will cause great harm to human health. big damage. In recent years, with the rapid economic development, the emission of nitrogen oxide pollutants has increased rapidly, seriously polluting the ecological environment. [0003] Coal-fired power plants are the main enterprises that emit nitrogen oxides, and their emissions account for about 25-40% of the national nitrogen oxide emissions. The state has strictly controlled the emission of nitrogen oxides in the flue gas o...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/22B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/22B01J23/8892B01D2258/0283B01J35/615
Inventor 李倩王虎张捷黄力纵宇浩董晓真严巍
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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