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Mesoporous iron-based compound oxide catalyst, preparation method and use thereof to ammonia selective catalytic reduction of nitric oxide

A composite oxide and catalyst technology, which is applied in the field of environmental catalytic purification, can solve problems such as narrow temperature window, poor stability, and insufficient low-temperature activity, and achieve low cost, good thermal stability and sulfur resistance, and excellent medium and low temperature activity. Effect

Active Publication Date: 2014-10-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the existing NH 3 -Insufficient low-temperature activity, poor stability, and narrow temperature window of the Fe-based catalyst system in SCR, the present invention provides for the first time a novel Fe-based composite oxide catalyst for catalytic purification of nitrogen oxides and its preparation method, which can be used As a fixed source flue gas denitrification

Method used

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  • Mesoporous iron-based compound oxide catalyst, preparation method and use thereof to ammonia selective catalytic reduction of nitric oxide
  • Mesoporous iron-based compound oxide catalyst, preparation method and use thereof to ammonia selective catalytic reduction of nitric oxide
  • Mesoporous iron-based compound oxide catalyst, preparation method and use thereof to ammonia selective catalytic reduction of nitric oxide

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Embodiment 1

[0019] Preparation of the mixed template: Add 0.18g of PVP to 200ml of deionized water, stir in a water bath at 30°C, wait until the PVP is completely dissolved and form a transparent solution, add 0.12g of CTAB to the solution, and continue stirring for 3 hours to form a uniform template solution.

Embodiment 2

[0021] Preparation of pure oxide catalyst: Weigh 4.04g of ferric nitrate, add it to the template solution prepared above, stir for 3 hours, after the solution is mixed evenly, adjust pH=10 with 0.5mol / L NaOH solution, and keep stirring at 90°C 24h; the obtained precipitate was washed and centrifuged with water and alcohol, dried in an oven at 100°C for 12h, and finally the dried sample precursor was roasted in a muffle furnace at 500°C for 4h to obtain powder catalyst A. Other conditions remained unchanged, and 1.87g of copper nitrate was used instead of ferric nitrate to prepare catalyst B. Other conditions remained unchanged, and 4.34 g of cerium nitrate was used instead of ferric nitrate to prepare catalyst C.

Embodiment 3

[0023] According to the mixed template preparation method of the present invention in Example 1, prepare a composite oxide catalyst: weigh 4.04g of ferric nitrate and 0.73g of copper nitrate, add them to the template solution prepared above, stir for 3h, and wait until the solution is evenly mixed, Use 0.5mol / L NaOH solution to adjust pH=10, and keep stirring at 90°C for 24h; wash and centrifuge the obtained precipitate with water and alcohol, dry it in an oven at 100°C for 12h, and finally place the dried sample precursor in a muffle furnace at 500 Calcined at ℃ for 4h to obtain powder catalyst D.

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Abstract

The invention discloses a mesoporous iron-based compound oxide catalyst, a preparation method and use of the mesoporous iron-based compound oxide catalyst to ammonia selective catalytic reduction of nitric oxide. The preparation method of the catalyst is a mixed template method, namely comprises the following steps: adding salts corresponding to required iron source and cerium source or copper source in a prepared mixed template solution; with one of sodium hydroxide or ammonium hydroxide as a settling agent, continuously stirring under the condition that the temperature is 80-120 DEG C for 12-36h; and then performing suction filtration, washing, drying and roasting to obtain the catalyst. The catalyst prepared by adopting the preparation method is applied to the ammonia selective catalytic reduction of nitric oxide, has the characteristics of high specific surface area, abundant pore structures, high medium and low temperature catalytic activity, excellent N2 selectivity, wide operation temperature window, good stability and the like, is suitable for a catalytic purifying device for an immobilization source nitric oxide especially smoke of a coal-fired power plant, and is wide in industrialized application prospect.

Description

technical field [0001] The invention is applied in the technical field of environmental catalytic purification, and relates to a mesoporous iron-based composite oxide catalyst, a preparation method and its application in ammonia selective catalytic reduction of nitrogen oxides. Background technique [0002] Nitrogen oxides mainly come from coal-fired flue gas and motor vehicle exhaust, and can affect human health and the ecological environment through haze, photochemical smog, and acid rain. In the national "Twelfth Five-Year Plan", the reduction of nitrogen oxides is included in the total amount of pollutants control indicators. NO x There are many methods for the removal of ammonia, among which the most widely studied and applied method is the Selective Catalytic Reduction (SCR) ammonia selective catalytic reduction method. Since many thermal power plants in China have installed desulfurization devices, dust and SO 2 It will affect the denitrification performance of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/83B01D53/90B01D53/56
Inventor 曲振平王辉苗雷马小江宋立颖
Owner DALIAN UNIV OF TECH
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