Supported iron-based composite oxide catalyst and preparation method thereof

A composite oxide and catalyst technology, applied in the field of denitration catalysts, can solve the problems of poor low temperature activity and narrow denitration activity temperature window, and achieve the effects of reducing poisoning, widening the denitration temperature window, and improving service life.

Inactive Publication Date: 2012-09-12
SHANDONG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a supported iron-based composite oxide catalyst and its preparation method to solve the shortcomings of existing metal oxide catalyst systems such as narrow denitrification activity temperature window and poor low-temperature activity.

Method used

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  • Supported iron-based composite oxide catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve the ammonium tungstate solution in the oxalic acid solution (the mass ratio of ammonium tungstate to oxalic acid is 1:2), and add a certain amount of ferric nitrate and cerium nitrate solution to the solution, stir the solution evenly by magnetic stirring, and add to the solution Add a certain amount of titania carrier to control Fe: Ce: W: TiO 2 The molar ratio of the mixture is 17.5:2.5:5:95. Firstly, the magnetic stirring is continued for 1 hour at room temperature for impregnation, and then an excessive amount of ammonia water is slowly added dropwise to the mixed solution for deposition until the pH value of the mixed solution is 9-10. After complete filtration and washing, the filter cake is put into a drying box and dried at 105°C, and the catalyst is obtained by calcining and activating in a muffle furnace at 400°C in air for 5 hours at most. Grind and sieve the prepared catalyst, take 40-60 mesh for later use, and become catalyst A.

Embodiment 2

[0021] The steps are as in Example 1, and ammonium molybdate is used instead of ammonium tungstate to prepare catalyst B.

Embodiment 3

[0023] Dissolve ferric nitrate, cerium nitrate and zirconium oxychloride in a certain amount of distilled water to obtain a mixed solution, stir the solution uniformly with magnetic force, add a certain amount of titanium dioxide carrier to the solution, and control Fe: Ce: Zr: TiO 2 The molar ratio of the mixture is 17.5:2.5:5:95. Firstly, the magnetic stirring is continued for 1 hour at room temperature for impregnation, and then an excessive amount of ammonia water is slowly added dropwise to the mixed solution for deposition until the pH value of the mixed solution is 9-10. After complete filtration and washing, the filter cake is put into a drying box and dried at 105°C, and the catalyst is obtained by calcining and activating in a muffle furnace at a maximum of 500°C in air for 5 hours. Grind and sieve the prepared catalyst, and take 40-60 mesh for later use. become catalyst C.

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Abstract

The invention relates to supported iron-based composite oxide catalyst and a preparation method thereof. The catalyst is made of titanium oxide or aluminum oxide serving as a carrier, iron and cerium serving as a host, and optional one or a plurality of transition metals such as tungsten, molybdenum, titanium and zirconium serving as axillaries. The mole ratio of the iron to the cerium is 1.0-10.0:1. The mole ratio of the host to the auxiliaries is 1.0-5.0:1. The mole ratio of the total of the host and auxiliaries to the carrier is 0.1-0.5:1. The preparation method includes: preparing the auxiliaries and the host into solution, soaking the carrier in the solution, dropwise adding precipitant for precipitation, filtering, drying and calcining. The catalyst has wide denitration temperature window and fine low-temperature denitration activity.

Description

technical field [0001] The invention relates to a denitrification catalyst, in particular to a loaded iron-based composite oxide catalyst used in the selective catalytic reduction and removal of nitrogen oxides in stationary sources such as coal-fired thermal power plants, and is applied in the fields of environmental protection and catalytic technology. Background technique [0002] The flue gas emitted by coal-fired stationary sources such as thermal power plants contains a large amount of nitrogen oxides, sulfur oxides, and carbon dioxide, among which nitrogen oxides (NO x , mainly NO and NO 2 ) will cause major environmental problems such as acid rain, photochemical smog, ozone depletion and greenhouse effect, and cause great harm to the ecological environment and human health. According to the National Energy Forecast and NO x Forecast of emission factors, if effective measures are not taken, my country's NO x Emissions will reach 25.74 million tons, about twice that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J23/887B01J23/83B01D53/56B01D53/86
Inventor 韩奎华熊志波路春美郭东旭牛胜利李英杰赵建立
Owner SHANDONG UNIV
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