Ferrum-cerium-titanium composite oxide catalyst, preparation method and application of ferrum-cerium-titanium composite oxide catalyst

A technology of composite oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of insignificant improvement in purification efficiency and overcome corrosion Volatility and volatility, improve fluidity, promote highly dispersed effect

Inactive Publication Date: 2013-05-01
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst uses Ce as the main active component, and Fe, W or Mo as catalyst promoters, although the SCR activity and N 2 The formation selectivity has a significant promotion effect, but it has a significant effect on the NO x The improvement of purification efficiency is not obvious, and it is urgent to develop a new type of high-efficiency composite oxide catalyst to meet the low-temperature NO emission under working conditions such as low exhaust temperature of stationary source flue gas or low exhaust temperature during cold start of diesel vehicles. x purification needs

Method used

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  • Ferrum-cerium-titanium composite oxide catalyst, preparation method and application of ferrum-cerium-titanium composite oxide catalyst
  • Ferrum-cerium-titanium composite oxide catalyst, preparation method and application of ferrum-cerium-titanium composite oxide catalyst

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Embodiment 1

[0042] An iron-cerium-titanium composite oxide catalyst, the catalyst has the following chemical composition: FeCe a TiO x , where a is 0.1.

[0043] The preparation method of above-mentioned catalyst comprises the steps:

[0044] (1) Prepare ferric nitrate, cerium nitrate and titanium sulfate solutions, mix ferric nitrate, cerium nitrate and titanium sulfate solutions evenly to obtain a mixed solution, control the molar ratio of Fe element to Ti element in the mixed solution to be 1:1, Ce element The molar ratio with Fe element is 0.1:1;

[0045] (2) Add excess urea precipitant to the mixed solution, the molar ratio of urea / (Fe source + Ce source + Ti source) is 10:1, and stir continuously for 12 hours in a water bath at 90°C to precipitate Fe, Ce and Ti ions Completely, the obtained precipitated product was suction-filtered, washed, dried in an oven at 100°C for 5h, and then calcined in a muffle furnace at 500°C for 3h in an air atmosphere to obtain the iron-cerium-titani...

Embodiment 2

[0047] An iron-cerium-titanium composite oxide catalyst, the catalyst has the following chemical composition: FeCe a TiO x , where a is 0.2.

[0048] The preparation method of above-mentioned catalyst comprises the steps:

[0049] (1) Prepare ferric nitrate, cerium nitrate and titanium sulfate solutions, mix ferric nitrate, cerium nitrate and titanium sulfate solutions evenly to obtain a mixed solution, control the molar ratio of Fe element to Ti element in the mixed solution to be 1:1, Ce element The molar ratio with Fe element is 0.2:1;

[0050] (2) Add excess urea precipitant to the mixed solution, the molar ratio of urea / (Fe source + Ce source + Ti source) is 10:1, and stir continuously for 12 hours in a water bath at 90°C to precipitate Fe, Ce and Ti ions Completely, the obtained precipitated product was suction-filtered, washed, dried in an oven at 100°C for 5h, and then calcined in a muffle furnace at 500°C for 3h in an air atmosphere to obtain the iron-cerium-titani...

Embodiment 3

[0052] An iron-cerium-titanium composite oxide catalyst, the catalyst has the following chemical composition: FeCe a TiO x , where a is 0.6.

[0053] The preparation method of above-mentioned catalyst comprises the steps:

[0054] A method for preparing an iron-cerium-titanium composite oxide catalyst, the method comprising the steps of:

[0055] (1) Prepare ferric nitrate, cerium nitrate and titanium sulfate solutions, mix ferric nitrate, cerium nitrate and titanium sulfate solutions evenly to obtain a mixed solution, control the molar ratio of Fe element to Ti element in the mixed solution to be 1:1, Ce element The molar ratio with Fe element is 0.6:1;

[0056] (2) Add excess urea precipitant to the mixed solution, the molar ratio of urea / (Fe source + Ce source + Ti source) is 10:1, and stir continuously for 12 hours in a water bath at 90°C to precipitate Fe, Ce and Ti ions Completely, the obtained precipitated product was suction-filtered, washed, dried in an oven at 10...

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Abstract

The invention relates to a ferrum-cerium-titanium composite oxide catalyst. A chemical formula of the catalyst is FeCeaTiOx, wherein a is greater than 0 but less than or equal to 1.6. The invention further discloses a preparation method of the catalyst. The method comprises the following steps of (1) preparing and uniformly mixing an Fe source solution, a Ce source solution, and a Ti source solution to obtain a mixed solution, and (2) adding excessive urea precipitant in the mixed solution, precipitating Fe, Ce and Ti ions, conducting suction filtration on an obtained precipitation product, washing, drying, roasting, and obtaining the ferrum-cerium-titanium composite oxide catalyst. The low-temperature activity of the catalyst is improved obviously, the preparation method is simple and practicable, and the catalyst is used for a purification process of selective catalyctic reduction of nitric oxide (NH3-SCR).

Description

technical field [0001] The invention relates to an iron-cerium-titanium composite oxide catalyst, a preparation method and use thereof. The catalyst is used in the selective catalytic reduction and purification process of nitrogen oxides. Background technique [0002] Nitrogen oxides (NO x ) is one of the main components of air pollution gases, it can cause acid rain and photochemical smog, form a higher ground-level ozone concentration, and also participate in the formation of airborne dust (PM2.5). NO x including N 2 O, NO, NO 2 , N 2 O 3 , N 2 O 4 , N 2 O 5 and other oxides. NO x The sources can be divided into stationary sources and mobile sources: stationary sources are mainly the combustion of fuel in industrial boilers and coal-fired power plants, and NO x The main source of emissions; mobile sources mainly refer to the exhaust emissions of motor vehicles. NO x Air pollution is a worldwide environmental problem, and its impact on the atmosphere mainly in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/56
Inventor 贺泓刘福东连志华谢利娟郑惠文单文坡石晓燕
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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