Power plant flue-gas SCR denitration catalyst capable of preventing sulfur trioxide poisoning and preparation method thereof

A denitrification catalyst and catalyst technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of reduced catalyst activity and disadvantages, and achieve low cost, Easy to operate, good anti-SO3 poisoning effect

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

And these sulfates (especially ammonium bisulfate) can deposit and accumulate on the surface of the catalyst, which is unfavorable for the SCR denitration reaction
Numerous studies have shown that SO 2 In the participating SCR denitrification reaction, as the reaction time increases, ammonium sulfate accumulates and blocks the pores of the catalyst, and the catalyst activity gradually decreases

Method used

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  • Power plant flue-gas SCR denitration catalyst capable of preventing sulfur trioxide poisoning and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 500g of metatitanic acid and 16.89g of ammonium paratungstate, dissolve the ammonium paratungstate in oxalic acid, mix the metatitanic acid and the oxalic acid solution of ammonium paratungstate, stir well, dry and calcinate in air for 6 hours, and grind to obtain tungsten-doped titanium dioxide Take by weighing 1.62g ammonium metavanadate and dissolve in oxalic acid solution, mix the oxalic acid solution of 100g tungsten-doped titanium dioxide and ammonium metavanadate evenly, then add additives such as clay, glass fiber and polyethylene oxide, wherein the tungsten The loaded amount is 10%, the loaded amount of vanadium is 1%, and the loaded amount of germanium or zinc is 3%, mechanically stirred for 1-2 hours to make it evenly mixed, put it in a drying oven, and heat it at a temperature of 70-110°C Drying in the air for 2-4 hours, then calcining in the air at 350-650°C for 3-6 hours, grinding and sieving after cooling, and taking the 40-60 mesh part as the cataly...

Embodiment 2

[0028] Weigh 750g of metatitanic acid and 25.34g of ammonium paratungstate, dissolve the ammonium paratungstate in oxalic acid, mix the metatitanic acid and the oxalic acid solution of ammonium paratungstate, stir well, dry and calcinate in air for 7 hours, and grind to obtain tungsten-doped titanium dioxide ; Take by weighing 2.587g ammonium metavanadate and be dissolved in oxalic acid solution, the oxalic acid solution of 100g doping tungsten titanium dioxide and ammonium metavanadate is evenly mixed, then add binding agent, additive and strengthening agent, wherein the loading capacity of tungsten is 8%, the vanadium load is 1.6%, the germanium or zinc load is 2%, stir mechanically for 1-2 hours to make it evenly mixed, put it in a drying oven, and dry it at a temperature of 70-110°C. The time is 2-4 hours, and then it is calcined at 350-650°C in the air for 3-6 hours. After cooling, it is ground and sieved, and the part with 40-60 meshes is used as the catalyst.

[0029] T...

Embodiment 3

[0031] Weigh 550g of metatitanic acid and 18.58g of ammonium paratungstate, dissolve ammonium paratungstate in oxalic acid, mix the oxalic acid solution of metatitanic acid and ammonium paratungstate, stir well, dry and calcinate in air for 6 hours, and grind to obtain tungsten-doped titanium dioxide ; Take by weighing 1.29g ammonium metavanadate and be dissolved in oxalic acid solution, mix the oxalic acid solution of 100g tungsten-titanium dioxide and ammonium metavanadate evenly, then add binding agent, additive and reinforcing agent, wherein the loading capacity of tungsten is 12%, the vanadium load is 0.8%, the germanium or zinc load is 4%, and mechanically stirred for 1-2 hours to make it evenly mixed, put it in a drying oven, and dry it at a temperature of 70-110°C. The time is 2-4 hours, and then it is calcined at 350-650°C in the air for 3-6 hours. After cooling, it is ground and sieved, and the part with 40-60 meshes is used as the catalyst.

[0032] The test method ...

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Abstract

The invention belongs to the chemical material field, in particular to an SO3 poisoning resisting power plant flue gas SCR denitrification catalyst and a preparation method thereof. Tungsten doped titanium pigment which is synthesized from domestic metatitanic acid slurry and ammonium paratungstate oxalic acid solution is adopted by the catalyst as a carrier. Vanadium is used as a main catalyst, and oxide of germanium or zinc is added as additive for lowering the oxidization of the vanadium on SO2. Through drying, calcining and sieving, the catalyst is obtained. The catalyst comprises 80-95wt percent of TiO2, 3-15wt percent of WO3, 1-8wt percent of V2O5 and 1-8wt percent of GeO2 or ZnO2. The preparation method has the advantages of simple preparation process, easy operation, low cost and good denitrification effect. The SCR catalyst prepared by the method is tested to prove high denitrification 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, in particular to an anti-SO 3 Poisoned power plant flue gas SCR denitrification catalyst and preparation method. Background technique [0002] Most of the large-scale power stations in my country are conventional coal-fired power stations, and nitrogen oxides (including NO, NO 2 , referred to as NOx) is one of the main pollutants emitted by coal-fired power plants. The emission of nitrogen oxides is being paid more and more attention, because the acid rain and photochemical smog caused by it have a serious impact on soil and water ecosystems. Most of NOx is produced by the oxidation of nitrogen in fuel and air during high temperature combustion. General NO and NO 2 The proportions in NOx are 95% and 5%, respectively. According to its formation mechanism, it is mainly controlled by low-NOx combustion technology or flue gas removal. At present, the feasible low-NOx emission technologies are ba...

Claims

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Application Information

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