Denitration catalyst for inhibiting SO2 oxidization as well as preparation method and application thereof

A denitration catalyst, SO2 technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. , the effect of stable denitration efficiency and simple preparation method

Inactive Publication Date: 2017-07-25
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a novel suppression SO 2 Oxidized denitrification catalyst and its preparation method to solve the problem of low-temperature sulfur poisoning and deactivation of traditional vanadium-titanium catalysts, and realize the emission control of nitrogen oxides in flue gases such as glass, steel, and coking coke ovens

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Catalyst preparation: add 0.01mol cerous nitrate hexahydrate, 0.04mol ferric nitrate nonahydrate, 0.001mol barium perchlorate, and 0.001mol ammonium metatungstate to 200 mL deionized water in sequence, stir and disperse to form a mixed solution; 10 g of titanium dioxide carrier was added to the above mixed solution, stirred and evaporated to dryness at 100°C; the evaporated product was collected and calcined at 500°C for 3 hours to obtain a finished catalyst.

[0014] 2. Catalyst performance test: The specific surface area of ​​the catalyst is 115 m 2 / g, measured by Tristar II 3020 automatic specific surface area and pore analyzer. Take 0.5 g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 0.8 cm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 500 ppm, NH 3 500 ppm, O 2 3 %, airspeed 40,000 h -1 , the reaction temperature is 150-300 °C, and the react...

Embodiment 2

[0018] 1. Catalyst preparation: add 0.01mol ammonium metavanadate, 0.04mol ferric chloride hexahydrate, 0.001mol barium perchlorate, 0.0005mol ammonium metatungstate to 400 mL deionized water in sequence, stir and disperse to form a mixed solution ; Add 10g of titanium dioxide carrier to the above mixed solution, stir and evaporate to dryness at 100°C; collect the evaporated product and roast it at 500°C for 3 hours to obtain the finished catalyst.

[0019] 2. Performance test of the catalyst: the specific surface area of ​​the catalyst is 120 m 2 / g, measured by Tristar II 3020 automatic specific surface area and pore analyzer. Take 0.5 g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 0.8 cm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 500 ppm, NH 3 500 ppm, O 2 3 %, airspeed 40,000 h -1 , the reaction temperature is 150-300 °C, and the reaction tail gas i...

Embodiment 3

[0023] 1. Catalyst preparation: Add 0.02mol vanadyl oxalate, 0.03mol cerium chloride hexahydrate, 0.001mol ammonium heptamolybdate tetrahydrate, and 0.002mol sodium tungstate to 200 mL deionized water in sequence, heat and stir to form a mixed solution ; Add 10g of titanium dioxide carrier to the above mixed solution, stir and evaporate to dryness at 100°C; collect the evaporated product and roast it at 500°C for 3 hours to obtain the finished catalyst.

[0024] 2. Catalyst performance test: The specific surface area of ​​the catalyst is 118 m 2 / g, measured by Tristar II 3020 automatic specific surface area and pore analyzer. Take 0.5 g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 0.8 cm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 500 ppm, NH 3 500 ppm, O 2 3 %, airspeed 40,000 h -1 , the reaction temperature is 150-300 °C, and the reaction tail gas is ...

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Abstract

The invention belongs to the technical field of atmosphere pollution control and in particular relates to a denitration catalyst for inhibiting SO2 oxidization as well as a preparation method and application thereof. The denitration catalyst takes titanium dioxide as a carrier, takes one or more of cerium oxide, iron oxide and vanadium oxide as active components and takes one or more of barium oxide, molybdenum oxide and tungsten oxide as auxiliary agents. The denitration catalyst has the advantages that the specific surface area of the catalyst is effectively enlarged and the denitration efficiency is remarkably improved; the problem of a traditional vanadium-based catalyst that low-temperature sulfur poisoning suddenly reduces the activity is solved. The denitration catalyst has the specific surface area of 100m<2>/g to 160m<2>/g; the denitration efficiency keeps 95 percent or more under conditions that the temperature is 150 DEG C to 300 DEG C and the air speed is 3,000h<-1> to 100,000h<-1>, and the N2 selectivity is higher than 92 percent; nitrogen oxide flue gas containing 0 to 3000mg/m<3> of SO2 still keeps 90 percent or more, the N2 selectivity is higher than 90 percent and the SO2 oxidization efficiency is less than 1 percent; the denitration catalyst has a high anti-sulfur capability and is especially suitable for nitrogen oxide emission control of flue gas generated in fields of glass, steel, coke ovens for coking and the like.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, in particular to a method for suppressing SO 2 Oxidized denitrification catalyst and its preparation method and application. Background technique [0002] With the rapid development of economy and society, energy consumption is also increasing continuously. my country is currently the second largest energy producer and consumer in the world, and the current situation in which coal consumption dominates the energy consumption structure is difficult to change for a long time in the future. Coal consumption causes soot-type air pollution, resulting in the emission of large amounts of harmful gases, such as nitrogen oxides. Nitrogen oxides (NO x ) is one of the most harmful pollutants in the atmosphere, which will cause a series of environmental problems such as acid rain and photochemical smog. The control and treatment of nitrogen oxide pollution has always been a research hotspot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J23/30B01J23/28B01J23/887B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/28B01J23/30B01J23/8877B01J23/888B01J35/1019B01J2523/00B01J2523/25B01J2523/3712B01J2523/47B01J2523/69B01J2523/842B01J2523/55B01J2523/68
Inventor 唐幸福陈俊逍高佳逸黄志伟刘小娜
Owner FUDAN UNIV
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