Ferro manganese composite oxides catalyst and preparation method and use thereof

A technology of composite oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high cost, poor resistance to sulfur and water, etc. Achieve the effect of improving service life, low cost and strong resistance to sulfur poisoning

Inactive Publication Date: 2009-08-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These catalysts also have various limitations, and some low-temperature activities are unsatisfactory (such as MnO x , CrO x / TiO 2 ), and some have higher costs (such as MnO x -CeO 2 ), some have poor sulfur and water resistance (such as MnO x , MnO x / TiO 2 )

Method used

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  • Ferro manganese composite oxides catalyst and preparation method and use thereof
  • Ferro manganese composite oxides catalyst and preparation method and use thereof
  • Ferro manganese composite oxides catalyst and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Mix ferric nitrate and manganese nitrate with a molar ratio of metal elements of Fe:Mn=0.5:1, and add ferric nitrate and manganese nitrate with a molar ratio of 0.05:1 Nitrates or acetates of additive elements (a mixture of cobalt nitrate, zinc nitrate, cerium nitrate, vanadium acetate and copper acetate) to obtain mixed metal salts;

[0026] (2) adding a citric acid solution with a molar concentration of 0.2mol / L into the mixed metal salt obtained in step (1), the mol ratio of citric acid to the metal element in the mixed metal salt is 12:10, stirred for 6h, and mixed uniformly;

[0027] (3) drying at 100°C for 6 hours at a constant temperature to obtain a solid;

[0028] (4) calcining the solid obtained in step (3) in air for 8 hours at a calcination temperature of 400° C. to obtain a mixed oxide;

[0029] (5) Cool the calcined mixed oxide, press it into tablets, grind and sieve to obtain a catalyst product with a particle size of 60-100 mesh. This product inclu...

Embodiment 2

[0036] (1) Mix iron acetate and manganese acetate with a metal element molar ratio of Fe:Mn=6:1, and add metal elements (ie, iron element and manganese element) with a molar ratio of 0.01:1 to the mixture of iron acetate and manganese acetate. Nitrates or acetates of auxiliary elements (mixtures of cobalt acetate, zinc acetate, cerium nitrate, vanadium nitrate and copper nitrate) to obtain mixed metal salts;

[0037] (2) adding a citric acid solution with a molar concentration of 1mol / L into the mixed metal salt obtained in step (1), the molar ratio of the citric acid to the metal element in the mixed metal salt is 3: 1, stirred for 3h, and mixed uniformly;

[0038] (3) drying at 80°C for 24 hours at a constant temperature to obtain a solid;

[0039] (4) calcining the solid obtained in step (3) in air for 3 hours at a calcination temperature of 650° C. to obtain a mixed oxide;

[0040] (5) Cool the calcined mixed oxide, press it into tablets, grind and sieve to obtain a catal...

Embodiment 3

[0045] (1) Mix ferric nitrate and manganese acetate with a molar ratio of metal elements of Fe:Mn=3:1, and add metal elements (ie, iron and manganese elements) with a molar ratio of 0.08:1 to the mixture of ferric nitrate and manganese acetate. Nitrates or acetates of additive elements (a mixture of cobalt acetate, cerium nitrate, vanadium nitrate and copper nitrate) to obtain mixed metal salts;

[0046] (2) adding a citric acid solution with a molar concentration of 2mol / L in the mixed metal salt obtained in step (1), the mol ratio of the citric acid and the metal element in the mixed metal salt is 1: 1, stirred for 4h, and mixed uniformly;

[0047] (3) Drying at 130°C for 12 hours at a constant temperature to obtain a solid;

[0048] (4) calcining the solid obtained in step (3) in air for 4 hours at a calcination temperature of 350° C. to obtain a mixed oxide;

[0049] (5) Cool the calcined mixed oxide, press it into tablets, grind and sieve to obtain a catalyst product wit...

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Abstract

The invention discloses an iron-manganese compound oxide catalyst for selectively catalyzing and reducing nitric oxides in flue gas at a low temperature and a preparation method thereof and application thereof. The catalyst comprises active components such as iron element, manganese element, auxiliary agent element and the like. The method for preparing the catalyst comprises the following steps: 1, the iron salt and the manganese salt are mixed, and added with nitrate or acetate of the auxiliary agent element to obtain a mixed metal salt; 2, a solution of citric acid is added in the mixed metal salt and evenly mixed by stirring; 3, at the constant temperature of between 40 and 160 DEG C, the mixed solution is dried to give a solid; 4, the solid is calcined in the air for 1 to 8 hours, the calcination temperature is between 200 and 900 DEG C, and a mixed oxide is obtained; and 5, the mixed oxide is ground, tabletted and screened to obtain the finished product of the catalyst. The catalyst can selectively catalyze and reduce nitric oxides in the flue gas at a low temperature under the aerobic condition, so that the catalyst has the characteristics of high activity, high selectivity and high stability.

Description

technical field [0001] The invention belongs to the field of heterogeneous catalyst preparation, in particular to an iron-manganese composite oxide catalyst and a preparation method thereof. The multi-component catalyst is suitable for NH 3 Selective catalytic reduction (SCR) of nitrogen oxides (NO x ) catalytic reaction in the field of environmental protection. Background technique [0002] At present, the most serious air pollution is acidification pollution, which comes from sulfur dioxide (SO2) emitted from exhaust gas. 2 and nitrogen oxides NO x (NO, NO 2 and N 2 O, etc.), in which flue gas from power plants accounts for about 50% of the total nitrogen oxide emissions, and the sharp deterioration of air quality makes the denitrification and desulfurization work quite urgent. The coal consumption of my country's thermal power units accounts for 49.5% of the total coal consumption. It is estimated that in the next 50 years, my country's coal-based energy structure wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/80B01J23/83B01D53/56B01D53/86
Inventor 李雪辉陈志航王芙蓉王乐夫
Owner SOUTH CHINA UNIV OF TECH
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