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Preparation method of cerium-titanium composite oxide low-temperature SCR catalyst

A technology for SCR catalysts and composite oxides, which is applied in the field of preparation of cerium-titanium composite oxide low-temperature SCR catalysts, can solve problems such as narrow temperature window, high working temperature, and cumbersome process, and achieves a green and environmentally friendly preparation method and easy control of preparation conditions , The effect of simple preparation process

Active Publication Date: 2016-12-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of traditional vanadium-titanium-based SCR catalysts are: (i) the active vanadium species are highly toxic and may cause secondary harm to the environment; (ii) the operating temperature is high and the temperature window is narrow
These preparation methods are all chemical methods, and the preparation process involves operations such as liquid preparation, neutralization, washing, filtration, and drying, and the process is cumbersome.
And will produce a lot of waste water, waste gas, pollute the environment

Method used

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  • Preparation method of cerium-titanium composite oxide low-temperature SCR catalyst
  • Preparation method of cerium-titanium composite oxide low-temperature SCR catalyst
  • Preparation method of cerium-titanium composite oxide low-temperature SCR catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh 10.1g of cerium nitrate hexahydrate, 5.05g of adipic acid, TiO 2 Put 16g into a ball mill jar, then add a certain number of agate balls of 20mm, 15mm and 10mm, the ratio of ball to material is 10:1, put it into a planetary ball mill, and grind for 0.5h. The uniformly mixed powder was put into a muffle furnace, and calcined at 250° C. for 2 hours and at 450° C. for 2 hours in an air atmosphere to obtain 1# catalyst sample.

Embodiment 2

[0033] Weigh 10.1g of cerium nitrate hexahydrate, 5.05g of adipic acid, TiO 2 Put 16g into the ball mill pot, then add a certain number of agate balls of 20mm, 15mm and 10mm, the ratio of ball to material is 10:1, put it into the planetary ball mill, grind for 1h, put the evenly mixed powder into the muffle furnace , in an air atmosphere, calcined at 250°C for 2 hours, and at 450°C for 2 hours to obtain the 2# catalyst sample.

Embodiment 3

[0035] Weigh 10.1g of cerium nitrate hexahydrate, 5.05g of adipic acid, TiO 2 Put 16g into the ball mill jar, then add a certain number of agate balls of 20mm, 15mm and 10mm, the ratio of ball to material is 10:1, put it into the planetary ball mill, grind for 2h, put the evenly mixed powder into the muffle furnace , in an air atmosphere, calcined at 250°C for 2 hours, and at 450°C for 2 hours to obtain 3# catalyst sample.

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Abstract

The invention discloses a preparation method of a cerium-titanium composite oxide low-temperature SCR catalyst and belongs to the technical field of catalyst preparation. The preparation method particularly includes: placing a cerium precursor, an organic ligand, a carrier TiO2 and a small amount of organic solvent into a ball milling tank for ball milling to obtain well-mixed powder; calcining to obtain the CeO2-TiO2 composite oxide catalyst, wherein content of cerium oxide is 5-90wt%. Within a temperature range of 200-400 DEG C, NO conversion ratio of the catalyst is maintained higher than 95%. The preparation process is simple, preparation conditions are easy to control, and the preparation method is environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of a cerium-titanium composite oxide low-temperature SCR catalyst and its application in ammonia selective catalytic reduction of nitrogen oxides, belonging to the technical field of catalyst preparation. Background technique [0002] Nitrogen oxides (NO x ) is a major air pollutant, and it is one of the important culprits that cause severe weather such as acid rain, photochemical smog, and smog. It is of great significance to develop efficient nitrogen oxide removal technology. Ammonia selective catalytic reduction (Selective Catalysis Reduction, NH 3 -SCR) is the most effective flue gas denitrification technology commercialized at present, and has been widely used in flue gas denitrification in thermal power plants. The core of SCR denitrification technology is the catalyst, and the current commercial denitrification catalysts are mainly vanadium-titanium-based (V 2 o 5 -WO 3 / TiO 2 or V 2 o 5 -M...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2255/40B01J21/063B01J23/10Y02P20/30
Inventor 邱文革闫京芳陈云何洪尹孟奇
Owner BEIJING UNIV OF TECH
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