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SCR denitration catalyst and preparation method thereof

A denitration catalyst, catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of affecting the service life of the catalyst, high preparation cost, catalyst corrosion, etc. value, reduce production costs, and expand the effect of application technology fields

Inactive Publication Date: 2016-06-22
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core of this technology is the catalyst, and its industrialized catalyst system is based on MO 3 or WO 3 Modified V 2 o 5 / TiO 2 , the catalytic system has high catalytic activity, anti-SO 2 The advantage of strong poisoning performance, but its preparation cost is high, and in practical engineering applications, due to the high temperature of the flue gas (about 400 ° C), it will cause the active component V 2 o 5 Sublimation occurs, and at the same time, a large amount of fly ash contained in the flue gas will cause serious corrosion to the catalyst and affect the service life of the catalyst

Method used

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  • SCR denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] After the serpentine is ground, sieve the sample of 300~400 objects, then it is 300 with sorbitol monostearate, polyoxyethylene sorbitan monostearate, water and 25wt% ammoniacal liquor according to mass ratio: Mixed at a ratio of 5:3:100:15, then placed in a water bath at 80°C for reflux treatment for 4 hours, and then transferred the obtained material to an oven at 105°C for 10 hours.

[0031] Weigh a certain amount of tetrabutyl titanate and diacetone acryloyl ammonium acetate dropwise into the nitric acid solution with a concentration of 15wt%, stir at room temperature for 30min, then continue the aging treatment for 6h, then weigh a certain amount of surface-treated Serpentine is added to the above mixed solution, wherein the mass ratio of serpentine, tetrabutyl titanate, diacetone acryloyl ammonium acetate and nitric acid is 10:120:2:5, and the above mixture is mixed at 500rpm / min After treatment under the same conditions for 18 hours, the solution was slowly evapo...

Embodiment 2

[0037] The 300~400 mesh serpentine sample, sorbitan monostearate, polyoxyethylene sorbitan monostearate, water and 25wt% ammonia water are in a mass ratio of 300:5:3:130:

[0038] After mixing at a ratio of 30, they were placed in a water bath at 50°C for reflux treatment for 6 hours, and then the resulting material was transferred to an oven at 120°C for 6 hours. A certain amount of tetrabutyl titanate and diacetone acryloyl ammonium acetate were respectively weighed and added dropwise to a nitric acid solution with a concentration of 15 wt%, stirred at room temperature for 30 min, and then aged for 6 h. Then weigh a certain amount of surface-treated serpentine and add it to the above mixed solution, wherein the mass ratio of serpentine, tetrabutyl titanate, diacetone acryloyl ammonium acetate and nitric acid is 10:28:0.5:1.0 , the above mixture was treated at 500rpm / min for 24h, then the solution was slowly evaporated to dryness in a water bath at 70°C, and the obtained prod...

Embodiment 3

[0041] The 300~400 mesh serpentine sample, sorbitol monostearate, polyoxyethylene sorbitan monostearate, water and 20wt% ammonia water are in a mass ratio of 300:5:3:110:

[0042] After mixing at a ratio of 18, they were placed in a water bath at 60°C for reflux treatment for 5 hours, and then the resulting material was transferred to an oven at 110°C for 8 hours. A certain amount of tetrabutyl titanate and diacetone acryloyl ammonium acetate were respectively weighed and added dropwise to the nitric acid solution with a concentration of 10wt%, stirred at room temperature for 25 minutes, and then continued to be aged for 4 hours. Then weigh a certain amount of surface-treated serpentine and add it to the above mixed solution, wherein the mass ratio of serpentine, tetrabutyl titanate, diacetone acryloyl ammonium acetate and nitric acid is 10:50:1:1.5 , the above mixture was treated at 650rpm / min for 22h, then the solution was slowly evaporated to dryness in a water bath at 75°C...

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Abstract

The invention discloses an SCR denitration catalyst and a preparation method thereof.The catalyst has a layer structure of serpentine, mesoporous titania and a nickel and vanadium composite oxide, wherein the mass ratio of serpentine to mesoporous titania to nickel and vanadium composite oxide is (25-45):(30-70):(0.5-2.0), the nickel and vanadium composite oxide is an active component Ni2V2O7, serpentine is in the form of particles, the outer layer of the serpentine particles is wrapped with a mesoporous TiO2 coating, and the surface of the coating is coated with the active component Ni2V2O7 to form an active layer of the composite oxide.Due to the fact that other materials which are low in price and easy to obtain are adopted to completely or partially replace TiO2, the preparation cost of the catalyst can be reduced, and the mechanical strength and corrosion resistance of the catalyst can be improved; meanwhile, other metallic oxides are adopted to be reacted with vanadium to form the composite oxide, and the possibility that sublimation occurs under the high-temperature condition is reduced.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to an SCR denitration catalyst and a preparation method thereof, in particular to an SCR denitration catalyst with a layered structure of serpentine-mesoporous titanium dioxide-nickel vanadium composite oxide and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) mainly comes from stationary sources such as coal-fired power plants and waste incineration plants, and mobile sources such as diesel engines and gasoline engines. NO x Not only does it pollute the air environment, it also causes acid rain, photochemical smog, PM2.5, ozone layer destruction and other phenomena, which in turn cause harm to human health. Industrial removal of NO from flue gas x The most effective method is to use NH 3 SCR technology as reducing agent. The core of this technology is the catalyst, and its industrialized catalyst system is based on MO 3 or WO 3 Modifie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01D53/86B01D53/76B01D53/56
CPCB01D53/56B01D53/76B01D53/8628B01D2251/2062B01D2255/20707B01D2255/20723B01D2255/20753B01D2257/402B01D2257/404B01D2259/122B01J23/002B01J23/8472B01J2523/00B01J2523/47B01J2523/55B01J2523/847Y02C20/10
Inventor 张鹏
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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