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A Mesoporous F, Ce Co-doped Scr Catalyst

A SCR catalyst and co-doping technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, heterogeneous catalyst chemical elements, etc., can solve the problems of catalyst particle agglomeration, reduced catalytic activity, and easy surface pollution, etc., to achieve High activation temperature, high catalytic denitrification rate, and good stability

Active Publication Date: 2020-12-01
合肥中亚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, after long-distance operation, catalyst particles are prone to agglomeration and surface contamination, resulting in reduced catalytic activity and poor stability.

Method used

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  • A Mesoporous F, Ce Co-doped Scr Catalyst
  • A Mesoporous F, Ce Co-doped Scr Catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Add 0.128 mol of acetylacetone to 0.064 mol of tetrabutyl titanate to make the molar ratio of acetylacetone / Ti=2; then add 50 mL of stoichiometric ammonium fluorotitanate in ethanol and stir for 2 hours to obtain a sol; After concentrating in a water bath, drying at 120°C for 6 hours, and then calcining at 500°C for 3 hours to obtain an F-doped titanium oxide support, in which ammonium fluorotitanate is added in a molar ratio F / Ti=0.005-0.02. The prepared F-doped titanium oxide support was immersed in 50 mL of ammonium paratungstate aqueous solution, refluxed in a water bath at 60°C for 4 hours, dried at 120°C for 6 hours, and then calcined at 500°C for 2 hours to obtain F-doped WO3 / TiO2, Where WO3The loading amount is 1wt%, denoted as F-WTi; doping F with WO3 / TiO2Soaked in 50mL ammonium metavanadate aqueous solution, refluxed in a 60℃ water bath for 4h, dried at 120℃ for 6h, and then calcined at 500℃ for 2h to obtain F-doped V 2O5-WO3 / TiO2Catalyst, where V2O5The load of 0.5% ...

Embodiment 2

[0033]On the basis of Example 1, while adding 50 mL of stoichiometric ammonium fluorotitanate in ethanol, 50 mL of stoichiometric cerous chloride in methanol was added. The other steps were the same as in Example 1, to prepare F and Ce Co-doped V2O5-WO3 / TiO2Denitration catalyst, denoted as m-FCe-VWTi. The NO removal rate was evaluated in the same manner as in Example 1.

Embodiment 3

[0040]Poisoning m-F-VWTi with K element: KNO3Dissolved in aqueous solution, according to KNO3The ratio of the volume of the solution to the mass of the catalyst powder is 2:1 for impregnation, and the K / V molar ratio is 4. Catalyst powder impregnated in KNO3After 12 hours, the solution was dried in an oven at 100°C, and calcined in the air at 500°C in a muffle furnace for 3 hours to obtain a powdered poisoning catalyst. Grind and sieve the prepared poisoned catalyst, take 40-60 meshes for use, and record it as K-m-F-VWTi. The results of the introduction of Ce element on the alkali metal resistance of the denitration catalyst are shown in Table 2.

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Abstract

The invention discloses a mesoporous F and Ce codoped catalyst V2O5-WO3 / TiO2 for selective catalytic denitration. According to the catalyst, a halogen element F and a rare earth element Ce are doped in a commonly used commercial catalyst V2O5-WO3 / TiO2; loading amounts of elements V and W in the catalyst and a loading way of the element W are optimized; thus, an activation temperature window of thecatalyst V2O5-WO3 / TiO2 is broadened. The mesoporous F and Ce codoped catalyst V2O5-WO3 / TiO2 is used for solving the technical problems that the catalyst V2O5-WO3 / TiO2 does not achieve a denitration purpose and the like when flue gas from bunker coal has an excessively low temperature and an air speed is varied more greatly, and is applicable to the treatment of the flue gas, which is generated byindustrial bunker coal, by the selective catalytic denitration.

Description

Technical field[0001]The invention relates to an SCR catalyst and its preparation method and application, in particular to a mesoporous heteroatom doped V2O5-WO3 / TiO2Catalyst, SCR catalyst with low content, high catalytic efficiency and low activation temperature and its application in catalytic denitrification of stationary source flue gas.Background technique[0002]At present, my country's energy consumption is increasing rapidly, the number of motor vehicles is increasing year by year, NOx emissions are rising, and the type of acid rain has changed from sulfuric acid type to sulfuric acid and nitric acid compound type. With SO2Removal technology is becoming more and more mature, and NOx removal has become a research hotspot.[0003]According to the relationship between fuel and unit, corresponding technical measures are taken to control NOx before, during and after combustion. Pre-combustion control technology mainly involves the treatment of fuel coal or the use of alternative fuel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/135B01J23/30B01J37/08B01J37/02B01J37/06B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/30B01J27/135B01J37/0009B01J37/0201B01J37/06B01J37/086B01J2523/00B01J2523/47B01J2523/55B01J2523/69
Inventor 延海港
Owner 合肥中亚环保科技有限公司
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