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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AI-Extracted 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-...

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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.

Application Domain

Gas treatmentPhysical/chemical process catalysts +1

Technology Topic

SolventOxalate +17

Examples

Experimental program(5)

Example Embodiment

[0018] Example 1:

[0019] 1. Preparation of the catalyst: add 0.01 mol ammonium metavanadate, 0.03 mol oxalic acid and 0.03 mol cerium nitrate hexahydrate to 200 mL of deionized water, stir well and disperse to form a mixed solution; then add 0.005 mol ammonium heptamolybdate and 0.01 mol of ammonium phosphate, stir and dissolve uniformly; then add 10 g of titanium dioxide carrier to the above mixed solution, stir and evaporate to dryness at 80°C; collect the evaporated product and calcinate at 500°C for 3 hours to obtain a finished catalyst.

[0020] 2. Catalyst performance test: 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 = 0.8 cm. 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 40,000 h -1 , The reaction temperature is 150~300 ℃, and the reaction tail gas is detected online with Antaris IGS gas analyzer. Under this test condition, the denitration efficiency of the catalyst is stable above 95%, N 2 The selectivity is above 96%.

[0021] 3. Test of the catalyst's anti-sulfur and anti-water performance: additional SO is added to the simulated flue gas 2 , Making SO 2 The concentration is 500 mg/m 3 , While adding H 2 O, making H 2 The volume fraction of O is 20%, and other test conditions remain unchanged. Under this test condition, the denitration efficiency of the catalyst is still stable above 92%, N 2 The selectivity is above 94%.

Example Embodiment

[0022] Example 2:

[0023] 1. Preparation of the catalyst: add 0.01 mol ammonium metavanadate and 0.04 mol oxalic acid to 200 mL of deionized water, stir and disperse thoroughly to form a mixed solution; then add 0.002 mol ammonium metatungstate, 0.01 mol nickel nitrate and 0.01 mol phosphoric acid respectively , Stir and dissolve uniformly; then add 10 g of the titanium dioxide carrier into the above mixed solution, stir and evaporate to dryness at 80°C; collect the evaporated product and calcinate at 350°C for 3 hours to obtain the finished catalyst.

[0024] 2. Catalyst performance test: 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 = 0.8 cm. The simulated flue gas is composed of NO, NH 3 , O 2 And N 2 Composition, where NO 500 ppm, NH 3 500 ppm, O 2 3%, airspeed 30,000 h -1 , The reaction temperature is 150~300 ℃, and the reaction tail gas is detected online with Antaris IGS gas analyzer. Under this test condition, the denitration efficiency of the catalyst is stable above 97%, N 2 The selectivity is above 96%.

[0025] 3. Test of the catalyst's anti-sulfur and anti-water performance: additional SO is added to the simulated flue gas 2 , Making SO 2 The concentration is 1,500 mg/m 3 , While adding H 2 O, making H 2 The volume fraction of O is 10%, and other test conditions remain unchanged. Under this test condition, the denitration efficiency of the catalyst is still stable above 90%, N 2 The selectivity is above 92%.

Example Embodiment

[0026] Example 3:

[0027] 1. Preparation of the catalyst: add 0.01mol ammonium metavanadate, 0.03mol oxalic acid and 0.005mol cerium nitrate hexahydrate to 200 mL of deionized water, stir and disperse to form a mixed solution; then add 0.002mol sodium tungstate and 0.01 respectively mol zirconium sulfate and 0.01 mol ammonium dihydrogen phosphate are stirred to dissolve uniformly; then 10 g of titanium dioxide carrier is added to the above mixed solution, stirred and evaporated to dryness at 80°C; the evaporated product is 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 = 0.8 cm. The simulated flue gas is composed of NO, NH 3 , O 2 And N 2 Composition, of which NO 1500 ppm, NH 3 1500 ppm, O 2 3%, airspeed 50,000 h -1 , The reaction temperature is 150~300 ℃, and the reaction tail gas is detected online with Antaris IGS gas analyzer. Under this test condition, the denitration efficiency of the catalyst is stable above 96%, N 2 The selectivity is above 94%.

[0029] 3. Test of the catalyst's anti-sulfur and anti-water performance: additional SO is added to the simulated flue gas 2 , Making SO 2 The concentration is 500 mg/m 3 , While adding H 2 O, making H 2 The volume fraction of O is 10%, and other test conditions remain unchanged. Under this test condition, the denitration efficiency of the catalyst is still stable above 92%, N 2 The selectivity is above 90%.

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PUM

Property	Measurement	Unit
Specific surface area	120.0	m²/g
Specific surface area	145.0	m²/g
Specific surface area	105.0	m²/g
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve denitrification efficiency

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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