F-doped SCR catalyst, preparation method and application thereof to catalytic denitration

A kind of SCR catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of high catalyst cost, achieve reduced production costs, high activation temperature, and good stability Effect

Inactive Publication Date: 2017-04-05
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the content of V species in the current commercial SCR catalysts is basically between 1.5-2%, and the content of W species is between 6-10%. The amount of V and W used in the catalyst is large, and a large amount of V and W species Precursors lead to higher catalyst costs, which are difficult for some power plants to bear

Method used

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  • F-doped SCR catalyst, preparation method and application thereof to catalytic denitration
  • F-doped SCR catalyst, preparation method and application thereof to catalytic denitration
  • F-doped SCR catalyst, preparation method and application thereof to catalytic denitration

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] To 0.064mol butyl titanate (C 16 h 36 o 4 Add 0.128mol acetylacetone (acacH, C in Ti) 6 h 8 o 2 ), so that [acacH] / [Ti]=2; then add 50mL stoichiometric ammonium fluorotitanate ((NH 4 ) 2 TiF 6 ) of ethanol (C 2 h 6 O) solution, stirred for 2 hours to obtain a sol; after concentrating the sol in a water bath at 60° C., dried at 120° C. for 6 hours, and then calcined at 500° C. for 3 hours to obtain a fluorine-doped titanium oxide carrier, wherein the addition of ammonium fluorotitanate was Molar ratio [F] / [Ti]=0.5×10 -2 ~2×10 -2 , the catalyst sample is denoted as TiF y , where y represents 100×[F] / [Ti], such as TiF 1.35 Indicates that [F] / [Ti]=1.35×10 in the sample -2 . The prepared F-doped titania carrier was impregnated in 50 mL of ammonium paratungstate (H 8 N 2 o 4 W) in an aqueous solution, reflux in a water bath at 60°C for 4h, dry at 120°C for 6h, and then calcinate at 500°C for 2h to obtain F-doped WO 3 / TiO 2 , where WO 3 The loading amount ...

example 2

[0035] When the V loading was 0.8wt%, the catalyst formulation was:

[0036] Each substance is measured by mass: TiO 2 100 parts, 1.07 parts of ammonium metavanadate, 0.56 parts of ammonium fluotitanate, 4.01 parts of ammonium paratungstate, 3 parts of methyl cellulose (HPMC), 3 parts of polyvinyl alcohol (PVA), 3 parts of aluminum stearate, 3 parts of aluminum phosphate 2 parts, 7 parts of silica sol, 10 parts of glass fiber (4 parts of 0.5mm, 4 parts of 1.0mm, 2 parts of 2mm) and 3 parts of glycerin.

[0037] When the V loading was 1.0wt%, the catalyst formulation was:

[0038] Each substance is measured by mass: TiO 2 100 parts, 1.34 parts of ammonium metavanadate, 0.56 parts of ammonium fluotitanate, 4.67 parts of ammonium paratungstate, 2.7 parts of methyl cellulose (HPMC), 3 parts of polyvinyl alcohol (PVA), 3 parts of aluminum stearate, 3 parts of aluminum phosphate 5 parts of silica sol, 10 parts of glass fiber (4 parts of 0.5mm, 4 parts of 1.0mm, 2 parts of 2mm) an...

example 3

[0046] The modular catalyst was prepared by using the catalyst formula when the V loading in Example 2 was 1.2 wt% and using the method described in Example 2.

[0047] 1), using 70kW coal-fired simulated flue gas denitrification evaluation device NO x The influence of the concentration on the denitrification reaction of the catalyst, the results are as follows Figure 7 shown.

[0048] Depend on Figure 7 It can be seen that in NO x In the concentration range of about 300-800ppm, the SCR denitration rate of the V(1.2) catalyst is stable at about 91%, reflecting a wide range of NO x Concentration activity removal window.

[0049] 2) Using the 100kW real flue gas denitrification evaluation device to evaluate the changes in the concentration of nitrogen oxides at the inlet, the results are as follows Figure 8 shown.

[0050] Depend on Figure 8It can be seen that when the generator is under the condition of relatively high external load, thermal nitrogen oxides are gener...

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PUM

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Abstract

The invention discloses an F-doped V2O5-WO3 / TiO2 catalyst for selective catalytic denitration. According to the catalyst, a halogen element F is doped to a widely-used commercial catalyst V2O5-WO3 / TiO2, and load amount of elements V and W in the catalyst and a load way for an element V in the catalyst are optimized, so that an activity temperature window of the V2O5-WO3 / TiO2 is widened. The F-doped V2O5-WO3 / TiO2 catalyst solves the technical problems that the V2O5-WO3 / TiO2 catalyst cannot realize the denitration purpose and the like when the temperature of coal-fired flue gas is too low and airspeed changes greatly, and is suitable for carrying out selective catalytic denitration on flue gas generated by industrial firing coals.

Description

technical field [0001] The present invention relates to a kind of SCR catalyst, preparation method and application, especially a kind of V 2 o 5 、WO 3 SCR catalyst with low content, high catalytic efficiency and low activation temperature and its application in catalytic denitrification in stationary source flue gas. Background technique [0002] At present, my country's energy consumption is increasing rapidly, and the number of motor vehicles is increasing year by year. NO x Emissions continue to rise, and the type of acid rain has changed from sulfuric acid to compound sulfuric acid and nitric acid. With SO 2 Removal technology is becoming more and more mature, NO x Removal has become a hot research topic. [0003] According to the relationship between fuel and unit, take corresponding technical measures to control NO before, during and after combustion x . The pre-combustion control technology mainly involves the treatment of fuel coal or the use of alternative f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01D53/56B01D53/86B01D53/94
Inventor 钟秦张舒乐曾毅清
Owner NANJING UNIV OF SCI & TECH
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