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SCR denitration catalyst as well as preparation method and application thereof

A denitrification catalyst and reaction technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as catalyst poisoning, cost increase, and unsatisfactory catalytic activity, and achieve low cost, long service life, Effect of excellent anti-alkali metal and anti-alkaline earth metal poisoning properties

Active Publication Date: 2012-09-12
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The catalysts disclosed above can effectively catalyze the reducing agent to convert the nitrogen oxides in the flue gas, but the above-mentioned catalysts are not resistant to the alkali metals and alkaline earth metals in the flue gas. When the content of alkali metals or alkaline earth metals in the flue gas is high When using the above-mentioned catalyst for catalysis, it is easy to cause poisoning of the catalyst, and the catalytic activity is not ideal, resulting in an increase in cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of sulfated zirconia support: ZrO 2 Immerse in 0.25mol / L, 15mL / g sulfuric acid solution and stir, then filter with suction, dry at 80°C, and finally burn at 600°C for 4 hours to obtain sulfated zirconia carrier SO 4 2- -ZrO 2 .

[0032] The preparation of catalyst: take 0.67g cerous nitrate hexahydrate (active substance precursor), add 4g sulfated zirconium dioxide carrier after dissolving with 50ml water, after stirring for 2 hours, dry at 80°C, burn at 450°C for 3 hours, and then The sample was immersed in a complex of 0.18 g of ammonium metavanadate (precursor of the co-catalyst) and 1 g of oxalic acid dissolved in water for 2 hours, and finally dried at 80°C and burned at 450°C for 3 hours to obtain the finished catalyst .

[0033] Catalyst performance test: Put the prepared catalyst into a fixed-bed quartz tube reactor for activity and selectivity tests, the reaction temperature is 320-520°C, and the space velocity is 180,000h -1 Under the conditio...

Embodiment 2

[0036] Preparation of sulfated zirconia support: ZrO 2 Immerse in 10mol / L, 100mL / g sulfuric acid solution and stir, then filter with suction, dry at 80°C, and finally burn at 600°C for 4 hours to obtain sulfated zirconia carrier SO 4 2- -ZrO 2 .

[0037] The preparation of catalyst: take 3.4g cerous nitrate hexahydrate (active material precursor), add 4g sulfated zirconia carrier after dissolving with 50ml water, after stirring for 2 hours, dry at 80°C, burn at 500°C for 3 hours, and then The sample was immersed in a complex made of 2.9 grams of ammonium metavanadate (co-catalyst precursor) and 1 gram of oxalic acid dissolved in water for 2 hours, and finally dried at 80°C and burned at 500°C for 3 hours to obtain the finished catalyst .

[0038] Catalyst performance test: Put the prepared catalyst into a fixed-bed quartz tube reactor for activity and selectivity tests, the reaction temperature is 320-520°C, and the space velocity is 180,000h -1 Under the condition of 2 ...

Embodiment 3

[0041] Preparation of sulfated zirconia support: ZrO 2 Immerse in 5mol / L, 150mL / g sulfuric acid solution and stir, then filter with suction, dry at 100°C, and finally burn at 700°C for 4 hours to obtain sulfated zirconia carrier SO 4 2- -ZrO 2 .

[0042] Preparation of the catalyst: Take 2.8g of cerous nitrate hexahydrate (active material precursor), dissolve it with 50ml of water, add 4g of sulfated zirconia carrier, stir for 2 hours, then dry at 100°C, burn at 450°C for 3 hours, and then Immerse the sample in a complex made of 1.00 g of ammonium tetramolybdate (precursor of the co-catalyst) and 1 g of oxalic acid dissolved in water for 2 hours, and finally dry at 100°C and burn at 450°C for 3 hours to obtain the catalyst finished product.

[0043] Catalyst performance test: Put the prepared catalyst into a fixed-bed quartz tube reactor for activity and selectivity tests, the reaction temperature is 320-520°C, and the space velocity is 180,000h -1 Under the condition of ...

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PUM

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Abstract

The invention discloses an SCR (Selective Catalytic Reduction) denitration catalyst as well as a preparation method and the application of the catalyst, wherein, sulfated zirconia is taken as a carrier, the surface of the carrier is loaded with rare-earth metal oxides that are taken as active ingredients and is loaded with transition metal oxides that are taken as a cocatalyst. The preparation method of the catalyst comprises the steps as follows: (1), zirconia is soaked in sulfuric acid solution, and the sulfated zirconia carrier is obtained after drying and burning are carried out; and (2), the zirconia carrier is in contact with ionic or complexing metal to be loaded proportionally in any sequence, adsorption is performed, and then the SCR denitration catalyst is obtained after drying and burning are carried out. The SCR denitration catalyst achieves excellent alkali metal and alkaline earth metal poisoning resistance when being used for the flue gas denitration, and is especially suitable for the flue gas denitration when the content of alkali metal or alkaline earth metal in flue gas is higher; the denitration efficiency of the SCR denitration catalyst stabilizes at more than 95 percent under a certain condition; and the denitration efficiency can still stabilize at more than 90 percent after being soaked in alkali metal solution or alkaline earth metal solution.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to an SCR denitrification catalyst and its preparation method and application. Background technique [0002] The main hazards of nitrogen oxides are: damage to the human body; formation of acid rain and acid fog; and C x h y Forms photochemical smog; destroys the ozone layer. NO x It mainly comes from fuel combustion process and various industrial production processes. The amount of flue gas emitted by coal-fired boilers is large, and more than 90% of them are NO x It exists as NO which is poorly soluble in water, so it is relatively difficult to control. On July 29, 2011, the Ministry of Environmental Protection made the third revision to the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB 13223-2011), stipulating that starting from January 1, 2012, all new thermal power units will be NO x The emission limit is 100mg / m 3 , emission standards ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01D53/86B01D53/56
Inventor 吴忠标王海强高珊陈雄波
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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