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Titanium-base multi-component catalyst for power plant flue-gas SCR denitration and preparation method thereof

A catalyst, catalyst carrier technology, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of good resistance to SO3 poisoning

Inactive Publication Date: 2009-04-01
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above-mentioned catalysts, considering the performance and durability of the catalyst, the catalyst containing a titanium dioxide carrier impregnated with vanadium and having an anatase crystal structure is most preferably used as a catalyst for selective catalytic reduction, however, the above-mentioned catalyst can only be used At 200-400°C, the optimum denitrification temperature window is at 250-350°C

Method used

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  • Titanium-base multi-component catalyst for power plant flue-gas SCR denitration and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 1.62g of ammonium metavanadate, 14.07g of ammonium paratungstate and 100g of titanium dioxide, and mix them uniformly in the aqueous solution, and add 12g of molybdenum nitrate, and stir mechanically for 1-2 hours to make them evenly mixed. The loading capacity of tungsten is 10% , the loading amount of vanadium is 1%, and the loading amount of molybdenum is 3%, put it into a drying oven after standing for 3 hours, and dry it at a temperature of 70-110°C for 4-8 hours, and then put it in the air Calcined at 350-650°C, the calcination time is 3-6 hours, after cooling, it is ground and sieved, and the part with 40-60 meshes is taken as the catalyst.

[0016] The test method for the SCR denitrification efficiency of the prepared catalyst is: put the prepared catalyst into a fixed-bed tubular reactor, and heat the reactor to the required reaction temperature with a tubular electric furnace. Simulated flue gas and reducing agent NH 3 into the reactor, where the compos...

Embodiment 2

[0026] Weigh 2.59g of ammonium metavanadate, 11.26g of ammonium paratungstate and 100g of titanium dioxide and mix them uniformly in the aqueous solution, and add 5.55g of cerium nitrate, and stir them mechanically for 1-2 hours to make them evenly mixed. The loading capacity of tungsten is 8%, the vanadium load is 1.6%, and the cerium load is 2%. Put it into a drying oven after standing for 3 hours, and dry it at a temperature of 70-110°C. The drying time is 4-8 hours, and then in the It is calcined at 350-650°C in the air, and the calcining time is 3-6 hours. After cooling, it is ground and sieved, and the part with 40-60 meshes is taken as the catalyst.

[0027] The test method of catalyst activity is the same as embodiment 1, at reaction temperature 450 ℃, C NO =C NH3 =0.2%, C O2 = 5%, air speed = 40000h -1 Under the tested conditions, the catalytic reduction efficiency of the wood catalyst remained above 90%.

Embodiment 3

[0029] Weigh 1.29g of ammonium metavanadate, 16.89g of ammonium paratungstate and 100g of titanium dioxide and mix them uniformly in the aqueous solution, and add 20.4g of manganese nitrate, and mechanically stir for 1-2 hours to make them evenly mixed. The loading capacity of tungsten is 12%, the loading of vanadium is 0.8%, the loading of manganese is 4%, put it into a drying oven after standing for 3 hours, and dry at a temperature of 70-110 °C for 4-8 hours, and then It is calcined at 350-650°C in the air, and the calcining time is 3-6 hours. After cooling, it is ground and sieved, and the part with 40-60 meshes is taken as the catalyst.

[0030] The test method of catalyst activity is the same as embodiment 1, at reaction temperature 450 ℃, C NO =C NH3 =0.2%, C O2 = 5%, air speed = 40000h -1 Under certain test conditions, the catalytic reduction efficiency of the catalyst remains above 87%.

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Abstract

The invention belongs to the chemical material field, in particular to a titanium-base multicomponent catalyst used for the denitrification of power plant flue gas SCR and a preparation method thereof. The catalyst comprises a catalyst carrier TiO2 accounting for 80-99wt percent of the total content, and the active components of 1-5wt percent of V2O5, 5-15wt percent of WO3 and 1-5wt percent of oxide of molybdenum or cerium or manganese according to the total content. The catalyst also comprises the other components of 0-5wt percent of MoO3, 0-5wt percent of CeO2 and 0-5wt percent of MnO3. The preparation process is: ammonium metananadate, ammonium paratungstate and titanium dioxide are mixed in water solution and are dried, calcined and sieved to obtain the catalyst. The catalyst has the advantages of active temperature region of 240-480 DEG C, high denitration efficiency, and good SO3 poisoning resistance. Added SO2 has almost no influence on the activity of the catalyst.

Description

technical field [0001] The invention belongs to the field of chemical materials, and in particular relates to a titanium-based multi-component catalyst used for SCR denitrification of flue gas in power plants and a preparation method thereof. Background technique [0002] my country's energy composition is dominated by coal, which consumes a lot of coal. The resulting environmental pollution is particularly serious, and the contradiction between energy development and utilization and environmental protection is particularly prominent. Most of the large-scale power stations in my country are conventional coal-fired power stations, while nitrogen oxides (NO x ) is one of the main pollutant emissions of thermal power generation. According to statistics, it was 4.69 million tons in 2000, 5.2 million tons in 2002, and is expected to reach 5.5 million tons in 2010. Nitrogen oxides are poisonous and harmful gases that can irritate the lungs and make it difficult for people to resi...

Claims

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Application Information

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IPC IPC(8): B01J23/16B01J23/10B01J21/06B01D53/56
Inventor 宋蔷姚强云端赵晓林马少丹孙海军
Owner TSINGHUA UNIV
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