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Low-temperature water-resistant and sulfur-resistant denitration catalyst as well as preparation method and application thereof

A denitration catalyst and low temperature technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low temperature sulfur poisoning, water poisoning inactivation, etc., to reduce the reduction of specific surface area and improve the denitration efficiency. , The effect of solving the sharp decline of low temperature poisoning activity

Inactive Publication Date: 2017-12-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a novel low-temperature water-resistant and sulfur-resistant denitrification catalyst and its preparation method, and to solve the problems of low-temperature sulfur poisoning and water poisoning inactivation of traditional vanadium-titanium catalysts, and to realize flue gas deactivation of glass, steel, coking coke ovens, etc. NOx emission control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Catalyst preparation: Add 0.01mol ammonium metavanadate, 0.03mol oxalic acid and 0.03mol cerous nitrate hexahydrate to 200 mL deionized water in sequence, stir and disperse to form a mixed solution; then add 0.005mol ammonium heptamolybdate and 0.01mol of ammonium phosphate was stirred and dissolved evenly; then 10g of titanium dioxide carrier was added to the above mixture, stirred and evaporated to dryness at 80°C; the evaporated product was collected and calcined at 500°C for 3 hours to obtain a finished catalyst.

[0020] 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 1000 ppm, NH 3 1000 ppm, O 2 3 %, airspeed 4...

Embodiment 2

[0023] 1. Preparation of catalyst: Add 0.01mol ammonium metavanadate and 0.04mol oxalic acid to 200 mL of deionized water in sequence, stir and disperse fully to form a mixed solution; then add 0.002mol ammonium metatungstate, 0.01mol nickel nitrate and 0.01mol phosphoric acid respectively , stirred and dissolved evenly; then 10g of titanium dioxide carrier was added to the above mixed solution, stirred and evaporated to dryness at 80°C; the evaporated product was collected and calcined at 350°C for 3 hours to obtain a finished catalyst.

[0024] 2. Performance test of the catalyst: the specific surface area of ​​the catalyst is 145 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 %, a...

Embodiment 3

[0027]1. Catalyst preparation: Add 0.01mol ammonium metavanadate, 0.03mol oxalic acid and 0.005mol cerous nitrate hexahydrate to 200 mL of deionized water in sequence, stir well and disperse to form a mixed solution; then add 0.002mol sodium tungstate, 0.01 1 mol of zirconium sulfate and 0.01 mol of ammonium dihydrogen phosphate were stirred and dissolved evenly; then 10 g of titanium dioxide carrier was added to the above mixture, stirred and evaporated to dryness at 80°C; the evaporated product was collected and calcined at 550°C for 3 hours to obtain a finished catalyst.

[0028] 2. Catalyst performance test: The specific surface area of ​​the catalyst is 105 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 1500 p...

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Abstract

The invention belongs to the technical field of atmospheric pollution control, in particular to a low-temperature water-resistant and sulfur-resistant denitration catalyst as well as a preparation method and application thereof. The denitration catalyst provided by the invention uses titanium dioxide as a carrier, uses one or several kinds of materials from vanadium oxide, vanadium phosphorus oxide and cerium oxide as active ingredients, uses one or several kinds of materials from molybdenum oxide, tungsten oxide, nickel oxide and zirconium oxide as auxiliary agents, and uses oxalic acid as cosolvents and dispersing agents. The catalyst can effectively reduce the catalyst specific area reduction in the roasting process; the denitration efficiency is obviously improved; in addition, the problem of sharp reduction of poisoning activity of the conventional vanadium-based catalyst at the lower temperature due to the existence of water and sulfur is solved. The denitration catalyst provided by the invention has the advantages that the denitration efficiency is stabilized at 93 percent or higher under the conditions of the temperature being 150 to 300 DEG C and the air speed being 5000 to 150000 h<-1>; the N2 selectivity is higher than 95 percent; the high water-resistant and sulfur-resistant capability is realized; the catalyst is particularly applicable to the oxynitride discharge control of smoke gas of glass, steel and iron, coking coke ovens and the like.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a low-temperature, water- and sulfur-resistant denitrification catalyst, a preparation method and application thereof. 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. [0003] During the "Twelfth Five-Year Plan" period, nitrogen oxide emissions were included in the assessment indicators for the first time, and "big nitrogen producers" such as thermal power plants and cement plants have gradually attracted t...

Claims

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Application Information

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IPC IPC(8): B01J27/199B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J27/199
Inventor 唐幸福陈俊逍高佳逸刘小娜
Owner FUDAN UNIV
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