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Catalyst for low-temperature V2O5-WO3/TiO2NH3 selective reduction catalysis of NO and preparation method thereof

A V2O5-WO3, catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. The effect of improving the ability of sulfur to resist water poisoning, good low temperature activity and high temperature activity, and broadening the working temperature window

Pending Publication Date: 2020-04-21
SHIYAN HUIBO ENVIRONMENTAL SCI & TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Regarding the emission control of nitrogen oxides in the tail gas of mobile sources, although my country has quickly implemented the national automobile emission standards of the fourth and fifth stages, the application of the SCR system has reduced the NOx emissions to a certain extent. x emissions, but the presence of NO x The problem of low removal rate leads to NO x Existing problems of varying degrees

Method used

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  • Catalyst for low-temperature V2O5-WO3/TiO2NH3 selective reduction catalysis of NO and preparation method thereof
  • Catalyst for low-temperature V2O5-WO3/TiO2NH3 selective reduction catalysis of NO and preparation method thereof
  • Catalyst for low-temperature V2O5-WO3/TiO2NH3 selective reduction catalysis of NO and preparation method thereof

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preparation example Construction

[0027] The present invention also provides a kind of above-mentioned NH 3 The preparation method of selective reduction catalytic NO catalyst comprises the following steps:

[0028] Step S1. Weigh the stoichiometric dispersant and cerium precursor respectively, the molar mass ratio of the dispersant to the cerium precursor is 0.1-2.0:1, then add an appropriate amount of deionized water to prepare a solution, and impregnate TiO after aging 2 Powder (titanium dioxide), TiO 2 TiO in powder 2 Content is 80~95wt%, WO 3 The content is 5~20wt%, TiO 2 The weight ratio of the powder to the solution is 1:2, and the Ce-doped modified TiO is obtained by drying and roasting. 2 Powder not; the aging time is greater than 2 hours, preferably 2-4 hours. The immersion time is preferably 4-6 hours, and the drying conditions are preferably drying at 60-120°C for 4-7 hours, and then baking at 400-600°C for 3-6 hours, so as to realize the dispersion and curing of the active components on the s...

Embodiment 1

[0037] Take by weighing 56 grams of cerium nitrate, add 27 grams of dispersing agent citric acid, 5 grams of dispersing agent polyethylene glycol, add deionized water and be mixed with 40% cerium nitrate solution, after aging for 3 hours, 74 grams containing 10wt% WO 3 Anatase titanium dioxide is added to the above solution for stirring, wherein the weight of titanium dioxide and the solution is 1:2, and finally dried and roasted, the drying temperature is 90°C, the drying time is 5h, the calcination temperature is 500°C, and the roasting temperature is 500°C. The time is 3h, and 100 grams of Ce-doped modified TiO are obtained 2 Powder is not.

[0038] Weigh 15 grams of oxalic acid, add 79 grams of deionized water to dissolve, and then add 6 grams of ammonium metavanadate to prepare a 6 wt % ammonium metavanadate solution. 100 grams of Ce-doped modified TiO obtained above 2 The powder was immersed in 21 grams of 6wt% ammonium metavanadate solution, ultrasonically dispersed a...

Embodiment 2

[0042] Take by weighing 56 grams of cerium nitrate, add 27 grams of dispersing agent citric acid, 5 grams of dispersing agent polyethylene glycol, add deionized water and be mixed with 40% cerium nitrate solution, after aging for 3 hours, 74 grams containing 10wt% WO 3 Anatase titanium dioxide is added to the above solution for stirring, wherein the weight of titanium dioxide and the solution is 1:2, and finally dried and roasted, the drying temperature is 90°C, the drying time is 5h, the calcination temperature is 500°C, and the roasting temperature is 500°C. The time is 3h, and 100 grams of Ce-doped modified TiO are obtained 2 Powder is not.

[0043] Weigh 15 grams of oxalic acid, add 79 grams of deionized water to dissolve, and then add 6 grams of ammonium metavanadate to prepare a 6 wt % ammonium metavanadate solution. 100 grams of Ce-doped modified TiO obtained above 2 The powder was immersed in 21 grams of 6wt% ammonium metavanadate solution, ultrasonically dispersed a...

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Abstract

The invention discloses a catalyst for low-temperature V2O5-WO3 / TiO2NH3 selective reduction catalysis of NO and a preparation method of the catalyst, and relates to the technical field of preparationof oxide low-temperature SCR catalysts. According to the catalyst for NH3 selective reduction catalysis of NO, cordierite (2MgO.2Al2O<3>.5SiO2) is used as an inert carrier, cerium-modified titanium dioxide with a high specific surface area is used as a second carrier, and an active component is oxide of vanadium; the catalyst for NH3 selective reduction catalysis of NO comprises, by weight, 100 parts of TiO2, 1 to 5 parts of V2O5, 10 to 60 parts of CeO2, 5 to 20 parts of WO3 and 1 to 5 parts of auxiliary agent oxide.

Description

technical field [0001] The invention relates to the technical field of preparation of oxide low-temperature SCR catalysts, specifically a low-temperature V 2 o 5 -WO 3 / TiO 2 NH 3 Selective reduction catalytic NO catalyst and preparation method. Background technique [0002] In recent years, due to the continuous and rapid growth of motor vehicle ownership and the massive combustion of fossil fuels, the resulting nitrogen oxides (NO x ) has caused a series of environmental problems such as acid rain, photochemical smog, ozone layer depletion and greenhouse effect, seriously affecting people's living environment and quality of life, and has attracted widespread attention from all over the world, and made NO x become one of the main air pollutants. For stationary and mobile source combustion emissions, countries have formulated increasingly stringent emission standards. Ammonia Selective Catalytic Reduction Technology (NH 3 -SCR) to NH 3 As a reducing agent, it has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/86B01D53/56B01D53/94
CPCB01J23/888B01J23/002B01D53/8628B01D53/9418B01J2523/00B01J2523/17B01J2523/22B01J2523/31B01J2523/3712B01J2523/47B01J2523/55B01J2523/69Y02P20/30
Inventor 李时民刘承虎张宏超刘俊
Owner SHIYAN HUIBO ENVIRONMENTAL SCI & TECHCO
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