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Iron-tungsten-titanium composite oxide catalyst, and preparation method and purpose thereof

A composite oxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the reduction of catalyst specific surface area, unfavorable industrial application, purification efficiency problems such as decline, to achieve the effect of overcoming the shortcomings of corrosiveness and volatility

Active Publication Date: 2013-04-10
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If calcined at high temperature, the specific surface area of ​​the catalyst will decrease rapidly, and the active phase will crystallize obviously, resulting in NO x The reduction of purification efficiency, so the improvement of high temperature thermal stability becomes the key to the practical industrial application of the catalyst
In addition, using corrosive and highly volatile ammonia water as a precipitant is not conducive to industrial applications, so there is an urgent need for improvement in the preparation method

Method used

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  • Iron-tungsten-titanium composite oxide catalyst, and preparation method and purpose thereof

Examples

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Effect test

Embodiment 1

[0038] An iron-tungsten-titanium composite oxide catalyst, the catalyst has the following chemical composition: FeW a TiO x , where a is 1.0.

[0039] The preparation method of above-mentioned catalyst comprises the steps:

[0040] (1) Prepare ferric nitrate, ammonium tungstate and titanium sulfate solutions in the presence of oxalic acid, mix ferric nitrate, ammonium tungstate and titanium sulfate solutions to obtain a mixed solution, and control the molar ratio of Fe and Ti in the mixed solution to 1:1, the molar ratio of W element to Fe element is 1:1;

[0041] (2) Add excess urea precipitant to the mixed solution, the molar ratio of urea / (Fe source + W source + Ti source) is 10:1, and stir continuously for 12 hours in a water bath at 90°C to precipitate Fe, W 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 iro...

Embodiment 2

[0043] An iron-tungsten-titanium composite oxide catalyst, the catalyst has the following chemical composition: FeW a TiO x , where a is 1.0.

[0044] The preparation method of above-mentioned catalyst comprises the steps:

[0045] (1) Prepare ferric nitrate, ammonium tungstate and titanium sulfate solutions in the presence of oxalic acid, mix ferric nitrate, ammonium tungstate and titanium sulfate solutions to obtain a mixed solution, and control the molar ratio of Fe and Ti in the mixed solution to 1:1, the molar ratio of W element to Fe element is 1:1;

[0046] (2) Add excess urea precipitant to the mixed solution, the molar ratio of urea / (Fe source + W source + Ti source) is 10:1, and stir continuously for 12 hours in a water bath at 90°C to precipitate Fe, W and Ti ions Completely, the obtained precipitated product was suction-filtered, washed, dried in an oven at 100°C for 5 hours, and then calcined in a muffle furnace at 600°C for 3 hours in an air atmosphere to obta...

Embodiment 3

[0048] An iron-tungsten-titanium composite oxide catalyst, the catalyst has the following chemical composition: FeW a TiO x , where a is 1.0.

[0049] The preparation method of above-mentioned catalyst comprises the steps:

[0050] (1) Prepare ferric nitrate, ammonium tungstate and titanium sulfate solutions in the presence of oxalic acid, mix ferric nitrate, ammonium tungstate and titanium sulfate solutions to obtain a mixed solution, and control the molar ratio of Fe and Ti in the mixed solution to 1:1, the molar ratio of W element to Fe element is 1:1;

[0051] (2) Add excess urea precipitant to the mixed solution, the molar ratio of urea / (Fe source + W source + Ti source) is 10:1, and stir continuously for 12 hours in a water bath at 90°C to precipitate Fe, W 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 700°C for 3h in an air atmosphere to obtain the iro...

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Abstract

The invention relates to iron-tungsten-titanium composite oxide catalyst. The catalyst has the chemical composition of FeWaTiOx, wherein a is greater than 0 and less than or equal to 1.6. The invention further discloses a preparation method of the catalyst, which comprises the following steps: (1), preparing the solutions of Fe source, W source and Ti source in the presence of oxalic acid, and mixing the solutions of Fe source, W source and Ti source to obtain a mixed solution; and (2), adding excessive urea precipitation agent into the mixed solution to ensure that ions can be fully deposited, and carrying out suction filtration, washing, drying and baking to obtained sedimentation products to obtain the iron-tungsten-titanium composite oxide catalyst. Compared with iron-tungsten-titanium composite oxide catalyst without adulteration, the iron-tungsten-titanium composite oxide NH3-SCR catalyst has an obviously improved high-temperature thermal stability, and is easier to apply to catalysis and decontamination of NOx in heavy duty diesel exhaust.

Description

technical field [0001] The invention relates to an iron-tungsten-titanium composite oxide catalyst, a preparation method and an application thereof. The catalyst can be used for heavy-duty diesel vehicle tail gas NO x The selective catalytic reduction (NH 3 -SCR) purification process. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in today's air pollution. Anthropogenic NO x Including NO produced by the combustion of fossil fuels such as coal and petroleum, and industrial production processes such as nitric acid, nitrogen fertilizers and dyes x . In anthropogenic sources NO x Among emissions, stationary source NO represented by flue gas from coal-fired power plants x and mobile sources of NO represented by diesel vehicle exhaust x accounted for approximately 60% and 40% of the NO x emissions share. NO x The existence of photochemical smog, acid rain, greenhouse effect and ozone layer depletion will cause major environmental pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/94B01D53/56
Inventor 贺泓刘福东谢利娟连志华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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