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NaTaO3/Sr2FeTaO6/alumina composite catalyst for flue gas denitrification, and preparation method thereof

A composite catalyst and alumina technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of poor thermal conductivity of honeycomb cordierite and catalyst high temperature resistance Poor performance, short residence time and other problems, to achieve the effect of easy control of the preparation process, high catalytic activity and high conversion rate

Active Publication Date: 2018-03-06
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst with the above structure has the problems of short residence time of gas on the surface of the catalyst and poor thermal conductivity of honeycomb cordierite, and the catalyst has disadvantages such as poor high temperature resistance, easy poisoning, and secondary pollution to the environment.

Method used

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  • NaTaO3/Sr2FeTaO6/alumina composite catalyst for flue gas denitrification, and preparation method thereof
  • NaTaO3/Sr2FeTaO6/alumina composite catalyst for flue gas denitrification, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 NaTaO 3 / Sr 2 FeTaO 6 / Preparation of alumina composite out-of-stock catalyst material and evaluation of catalyst out-of-stock

[0030] (1) Dissolve 10g of strontium carbonate in excess hydrochloric acid, fully stir until the precipitation disappears completely, then add excess sodium hydroxide, after fully stirring, the solid matter is centrifuged and fully washed with distilled water to obtain pure strontium hydroxide solid, drying;

[0031] (2) take by weighing 3.62g tantalum pentoxide and the prepared 4.95g strontium hydroxide of step (1) join in the sodium hydroxide solution that 41ml concentration is 4mol / L after fully stirring, add the nanometer iron powder of 0.92g ( 300 mesh), transferred to the autoclave;

[0032] (3) Transfer the high-pressure reaction kettle in step (2) to a muffle furnace for hydrothermal reaction, raise the temperature to 300°C at a rate of 2°C / min, keep it warm for 48 hours, and cool it naturally; wash it fully with distill...

Embodiment 2

[0039] The preparation method of embodiment 2 is the same as that of embodiment 1, except that hydrochloric acid is replaced by nitric acid.

[0040] The activity test method is the same as in Example 1; the conversion rate of NO is above 96%.

Embodiment 3

[0042] The preparation method of embodiment 3 is the same as that of embodiment 1, except that hydrochloric acid is replaced by sulfuric acid.

[0043] The activity test method is the same as in Example 1; the conversion rate of NO is above 93%.

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Abstract

The invention discloses a NaTaO3 / Sr2FeTaO6 / alumina composite catalyst for flue gas denitrification, and a preparation method thereof. The catalyst is prepared by preparing NaTaO3 / Sr2FeTaO6 powder mainly from raw materials: strontium carbonate, tantalum pentoxide and abrasive grit as raw materials, and then coating on the surfaces of carrier small alumina spheres. The prepared NaTaO3 / Sr2FeTaO6 / alumina composite catalyst for flue gas denitrification is an iron-containing SCR catalyst which is a novel material and structure and is environment-friendly, and the composite catalyst has the advantages of being wide in reaction window temperature, high in catalytic activity, pollution-free and the like; the catalyst can conduct denitrification under low-temperature condition, and high in conversion rate of NO and other NNOx gases. In addition, a method for preparing NaTaO3 / Sr2FeTaO6 / alumina denitrification SCR catalyst is simple in technology, low in cost, wide in raw materials, and has the advantages of being easily controlled for preparation processes, high in yield and the like.

Description

technical field [0001] The invention belongs to the technical field of low-temperature denitrification catalysts, in particular to a NaTaO catalyst used for flue gas denitrification 3 / Sr 2 FeTaO 6 Alumina / alumina composite catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) include a variety of compounds, but the main components are NO and NO 2 . NOx emitted by human activities is mainly produced by fuel combustion and chemical industry production, such as fixed sources of fuel combustion such as thermal power plants, chemical plants, and steel plants, and mobile sources such as motor vehicles. In addition, a small amount of NOx is also produced in industrial production process and residential life. NOx is not only highly toxic to humans, animals and plants, but also the main cause of acid rain, smog and photochemical smog, and also participates in the destruction of the ozone layer. The control and treatment of nitrogen oxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01D53/86B01D53/56
CPCB01D53/8628B01D2255/2027B01D2255/204B01D2255/20738B01D2255/2092B01D2258/0283B01J23/8476
Inventor 侯贵华刘怀平崔恩田宋正华张峰姜瑞雨张勤芳
Owner YANCHENG INST OF TECH
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