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Low temperature NH3-SCR denitration catalyst for flue gas with low water vapor content, and preparation method thereof

A technology of NH3-SCR and catalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. It can solve the problems of unexamined catalyst activity and achieve high and low temperature activity , The effect of simple preparation process and easy operation

Inactive Publication Date: 2013-07-03
上海钒铖环保科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Qi [9] Reported Manganese Composite Catalyst Mn-CeO 2 It is the most active catalyst among the low-temperature SCR catalysts reported so far. Experimental research shows that when the molar ratio of Mn(Mn+Ce) is 0.3, the catalyst has a space velocity of 42000h at a low temperature of 120°C. -1 maintain nearly 100% denitrification efficiency, but generally do not examine the high concentration of water vapor and SO 2 At the same time, there is an influence on the catalyst activity

Method used

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  • Low temperature NH3-SCR denitration catalyst for flue gas with low water vapor content, and preparation method thereof
  • Low temperature NH3-SCR denitration catalyst for flue gas with low water vapor content, and preparation method thereof
  • Low temperature NH3-SCR denitration catalyst for flue gas with low water vapor content, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 7.44g of niobium oxalate and dissolve in 20ml of deionized water at 50°C. After the niobium oxalate is completely dissolved, add 21.05g of cerium nitrate and 7.92g of manganese acetate to the niobium oxalate solution to form a mixed solution, and add 12.91g of TiO 2 Prepare the mixture, keep the mixture at 50°C and stir for 1 hour to make the mixture fully homogeneous, and let stand for 1 hour. Dry at 120°C for 12 hours and bake at 550°C for 6h. The roasted product is cooled, pulverized, sieved, and the powder smaller than 80 mesh is taken for later use. Weigh 7.00g of powder less than 80 mesh and mix with 3.00g of pseudo-boehmite powder evenly, add 2.0ml of 10wt% nitric acid solution to the mixed powder and mix evenly to form a dough, put it into a syringe and extrude into strips, Drying at 550°C for 6 hours. Cool after roasting, crush and sieve to take the 20-40 mesh part as the catalyst.

[0046] The detection method of the denitrification rate of the prepa...

Embodiment 2

[0052] Weigh 1.86g of niobium oxalate and dissolve in 20ml of deionized water at 50°C. After the niobium oxalate is completely dissolved, add 21.05g of cerium nitrate and 7.92g of manganese acetate into the niobium oxalate solution to form a mixed solution, and add 12.91g of TiO 2 Prepare the mixture, keep the mixture at 50°C and stir for 1 hour to make the mixture fully homogeneous, and let stand for 1 hour. Dry at 120°C for 12 hours and bake at 550°C for 6h. The roasted product is cooled, pulverized, sieved, and the powder smaller than 80 mesh is taken for later use. Weigh 7.00g of powder less than 80 mesh and mix with 3.00g of pseudo-boehmite powder evenly, add 2.0ml of 10wt% nitric acid solution to the mixed powder and mix evenly to form a dough, put it into a syringe and extrude into strips, Drying at 550°C for 6 hours. Cool after roasting, crush and sieve to take the 20-40 mesh part as the catalyst.

[0053] The detection method of the denitration rate of the prepare...

Embodiment 3

[0056] Weigh 21.05g of cerium nitrate and 7.92g of manganese acetate dissolved in 20ml of deionized water at 50°C to form a mixed solution, and add 12.91g of TiO to the mixed solution 2 Prepare the mixture, keep the mixture at 50°C and stir for 1 hour to make the mixture fully homogeneous, and let stand for 1 hour. Dry at 120°C for 12 hours and bake at 550°C for 6h. The roasted product is cooled, pulverized, sieved, and the powder smaller than 80 mesh is taken for later use. Weigh 7.00g of powder less than 80 mesh and mix with 3.00g of pseudo-boehmite powder evenly, add 2.0ml of 10wt% nitric acid solution to the mixed powder and mix evenly to form a dough, put it into a syringe and extrude into strips. Drying at 550°C for 6 hours. Cool after roasting, crush and sieve to take the 20-40 mesh part as the catalyst.

[0057] The detection method of the denitration rate of the prepared catalyst is the same as that in Example 1.

[0058] According to the results of the activity t...

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Abstract

The invention discloses a low temperature NH3-SCR denitration catalyst for a flue gas with low water vapor content. The catalyst is an oxide prepared by an impregnation method with TiO2 as a carrier loaded with Mn, Ce and Nb. The invention also discloses a preparation process of the catalyst. A preparation process of the catalyst is simple and easy to operate. The addition of Nb increases denitration performance of the catalyst for the flue gas with water vapor content as high as 12% and SO2 content of 1,000 ppm. The denitration rate at a temperature of 160 DEG C and in presence of 12% of water vapor and 1,000 ppm of SO2 can reach over 80%.

Description

technical field [0001] The present invention relates to a catalyst, more particularly, the present invention relates to a low-temperature NH 3 - SCR catalyst and method of preparation. Background technique [0002] Nitrogen oxides (NO, NO 2 , N 2 O and N 2 o 3 etc.) is one of the main sources of air pollution, which has a stimulating effect on the human respiratory system and is the main cause of photochemical smog, acid rain, ozone hole and greenhouse effect. Selective Catalytic Reduction (SCR, Selective Catalytic Reduction) is currently the most effective denitrification method. use NH 3 Primary reaction as reducing agent [1] Have: [0003] 4NO+4NH 3 +O 2 →4N 2 +6H 2 o [0004] 2NO 2 +4NH 3 +O 2 →3N 2 +6H 2 o [0005] The relatively successful commercial application of SCR denitration catalysts is mainly based on titanium vanadium (V 2 o 5 / TiO 2 ) based high temperature SCR denitrification catalyst, by adding WO 3 [2] , MO 3 [3] , CeO 2 [4] and...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/90B01D53/56
Inventor 王漫赵金山杨义球
Owner 上海钒铖环保科技有限公司
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