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TiO2 supported manganese-cerium composite oxide catalyst and preparation method thereof

A technology of composite oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. The problem of poor dispersibility, etc., to achieve the effect of uniform particles, high catalytic activity and good dispersibility

Inactive Publication Date: 2009-01-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above low-temperature SCR catalysts are mostly prepared by impregnation or chemical precipitation. The dispersion of active components on the carrier is relatively poor, and the catalyst is prone to sintering and peeling, which greatly limits the catalytic activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Catalyst preparation: using sol-gel method, using n-propyl titanate, ethanol, water, manganese nitrate, cerium nitrate and acetic acid as raw materials, the molar ratio of each raw material is 1:5:1:0.1:0.1:1, each component Mix well and stir quickly, form a reddish-brown sol and continue to stir for 2 hours. After aging for several days, it will form a gel. Put it in an oven and dry it at 105°C, then put it in a muffle furnace, and calcinate at 400°C for 3 hours. Hours, powdered catalyst was obtained after grinding and sieving.

[0022] Catalyst activity test: The activity test was carried out on a fixed-bed reactor with a catalyst loading of 4 mL and a particle size of 60-100 mesh. Application processing NO: NH 3 = 1, O 2 Concentration = 3%, GHSV (gas space velocity per hour) = 30000h -1 When the reaction temperature is 80°C, the denitrification efficiency is about 80%, and when the reaction temperature is 120°C, the catalytic efficiency is close to 100%.

Embodiment 2

[0024]Catalyst preparation: using sol-gel method, using n-butyl titanate, ethanol, water, manganese nitrate, cerium nitrate and acetic acid as raw materials, the molar ratio of each raw material is 1:5:1:0.3:0.3:2, each component Mix well and stir rapidly, form a reddish-brown sol and continue to stir for 2 hours. After aging for several days, it will form a gel. Put it in an oven and dry it at 105°C, then put it in a muffle furnace, and calcinate at 500°C for 3 Hours, powdered catalyst was obtained after grinding and sieving.

[0025] The catalyst activity test is the same as that in Example 1. When the reaction temperature is 80°C, the denitrification efficiency is about 80%, and when the reaction temperature is 120°C, the catalytic efficiency is close to 100%.

Embodiment 3

[0027] Catalyst preparation: using sol-gel method, using titanium isopropoxide, ethanol, water, manganese sulfate, cerium sulfate and nitric acid as raw materials, the molar ratio of each raw material is 1:10:2:0.4:0.4:2, each component is fully Stir quickly after mixing to form a reddish-brown sol and continue to stir for 2 hours. After aging for several days, it becomes a gel. Put it in an oven and dry it at 105°C, then put it in a muffle furnace, and calcinate at 600°C for 3 hours. , after grinding and sieving powder catalyst.

[0028] The catalyst activity test is the same as that in Example 1. When the reaction temperature is 80°C, the denitrification efficiency is about 70%, and when the reaction temperature is 120°C, the catalytic efficiency is above 98%.

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Abstract

The invention discloses a manganese-cerium complex oxide catalyst loaded by TiO2, which takes nanometer titanium dioxide as a carrier and the manganese-cerium complex oxide loaded on the carrier as an active ingredient. The mole ratio of each ingredient is that Ti: Mn: Ce is equal to 1: (0.05 to 1): (0.05 to 1). The invention also discloses a preparation method of the catalyst, which adopts sol-gel preparation technology to promote the dispersity and strength of the two ingredients of manganese and cerium on a TiO2 carrier. Furthermore, the catalyst prepared by adopting the preparation method has the advantages of high catalytic activity and uniform particles; active substances is good in dispersity and is hard to sinter; when used in low-temperature SCR reaction, the catalyst can greatly lower the operation temperature and the operation cost of the SCR since the catalyst has a very high removal rate of NO at the temperature about 120 DEG C.

Description

technical field [0001] The invention relates to a catalyst used in the technical field of air pollution control and a preparation method thereof, in particular to a TiO catalyst prepared by a sol-gel method. 2 The supported manganese-cerium composite oxide catalyst is used for the selective catalytic reduction reaction of nitrogen oxides under low temperature conditions. Background technique [0002] Take NH 3 Selective Catalytic Reduction (SCR) as a reducing agent is currently the most researched, most widely used, and most effective flue gas NO X removal technique. NH 3 , NO and O 2 Under the action of a catalyst, a reduction reaction occurs to generate N 2 and H 2 O. [0003] The most mature SCR catalyst currently used is V 2 o 5 / TiO 2 or at V 2 o 5 / TiO 2 Based on modified catalysts. But such catalysts still have some problems. One is that the cost of the catalyst is higher, and the other is that the operating temperature must be higher than 350°C. To pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/10B01J21/06B01D53/56
Inventor 吴忠标金瑞奔刘越江博琼王海强
Owner ZHEJIANG UNIV
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