Manganese-cerium composite oxide low-temperature denitration catalyst with hollow multi-shell microsphere structure

A composite oxide and low-temperature denitrification technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of vanadium-titanium-based catalysts, catalyst poisoning, Temperature drop and other problems, to achieve the effect of improving low-temperature denitrification performance, good denitrification activity, and long contact time

Inactive Publication Date: 2015-08-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the activity temperature of the vanadium-titanium-based catalyst is in the range of 300-400°C, in order to achieve such a temperature range, the denitrification device must be placed before dust removal and desulfurization. This arrangement has obvious disadvantages: the dust and SO in the flue gas 2 Harmful substances such as catalyst poisoning and premature deactivation
However, after the flue gas is dedusted and desulfurized, the temperature will drop significantly, which cannot meet the needs of vanadium-titanium-based catalysts. Therefore, it is urgent to develop high-efficiency denitrification catalysts with low-temperature activity.

Method used

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  • Manganese-cerium composite oxide low-temperature denitration catalyst with hollow multi-shell microsphere structure
  • Manganese-cerium composite oxide low-temperature denitration catalyst with hollow multi-shell microsphere structure

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Prepare 20ml of a mixed solution containing Ce ions and Mn ions, wherein the concentration of Ce ions is 0.029mol / L, and the concentration of Mn ions is 0.019mol / L. At the same time, 60ml of glucose solution of 0.53mol / L is prepared, and then the mixed solution is added to Stir evenly into the glucose solution;

[0020] (2) transfer the homogeneously mixed solution into a reaction kettle, and conduct a hydrothermal reaction at 180° C. for 20 hours;

[0021] (3) After naturally cooling to room temperature, the product of the hydrothermal reaction was washed three times with water and ethanol respectively, then dried at 80°C, and then calcined at 400°C in a muffle furnace for 7.5 hours to obtain a hollow Manganese-cerium composite oxide with multi-shell microsphere structure.

[0022] The microsphere Mn: (Mn+Ce) = 0.4, the diameter of the microsphere is 3 μm after testing, and the specific surface area is 180m 2 / g. Catalyst activity test adopts fixed bed reactor, ...

Embodiment 2

[0024] (1) Prepare 20ml of a mixed solution containing Ce ions and Mn ions, wherein the concentration of Ce ions is 0.029mol / L, and the concentration of Mn ions is 0.067mol / L. At the same time, 60ml of glucose solution of 0.53mol / L is prepared, and then the mixed solution is added to Stir evenly into the glucose solution;

[0025] (2) transfer the homogeneously mixed solution into a reaction kettle, and conduct a hydrothermal reaction at 180° C. for 20 hours;

[0026] (3) After naturally cooling to room temperature, the product of the hydrothermal reaction was washed three times with water and ethanol respectively, then dried at 80°C, and then calcined at 400°C in a muffle furnace for 7.5 hours to obtain a hollow Manganese-cerium composite oxide with multi-shell microsphere structure.

[0027] The microsphere Mn: (Mn+Ce) = 0.7, the diameter of the microsphere is 2.5 μm after testing, and the specific surface area is 112m 2 / g. Catalyst activity test adopts fixed bed reactor...

Embodiment 3

[0029] (1) Prepare 20ml of a mixed solution containing Ce ions and Mn ions, wherein the concentration of Ce ions is 0.029mol / L, and the concentration of Mn ions is 0.0072mol / L. At the same time, 60ml of glucose solution of 0.53mol / L is prepared, and then the mixed solution is added to Stir evenly into the glucose solution;

[0030] (2) transfer the homogeneously mixed solution into a reaction kettle, and conduct a hydrothermal reaction at 180° C. for 20 hours;

[0031] (3) After naturally cooling to room temperature, the product of the hydrothermal reaction was washed three times with water and ethanol respectively, then dried at 80°C, and then calcined at 400°C in a muffle furnace for 7.5 hours to obtain a Manganese-cerium composite oxide with multi-shell microsphere structure.

[0032] The microsphere Mn: (Mn+Ce) = 0.2, the diameter of the microsphere is 2.7 μm after testing, and the specific surface area is 115m 2 / g. Catalyst activity test adopts fixed bed reactor, inle...

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Abstract

The invention provides a manganese-cerium composite oxide low-temperature denitration catalyst with a hollow multi-shell microsphere structure, which belongs to the technical field of catalytic treatment of flue gas. The catalyst is characterized in that the catalyst is composite oxide of MnOx and CeO2 and has the hollow multi-shell microsphere structure, and the diameters of microspheres are in a range of 1 to 3 [mu]m; annular cavities are located among spherical shells, so a hollow multi-shell structure is formed, which enables the catalyst to have a great specific surface area, as great as 110 to 190 m<2> / g; MnOx and CeO2 are uniformly distributed and in a mol ratio of Mn to Mn+Ce of 0.2 to 0.7; and MnOx is composed of Mn2O3 and MnO2. The catalyst has good selective catalytic reduction performance at a low temperature; the denitration efficiency of the catalyst reaches more than 95% when reaction temperature is 180 DEG C and reaction space velocity is 36000 per hour; and the catalyst is applicable to treatment of nitrogen oxides in flue gas of fire coal and has wide application prospects.

Description

technical field [0001] The invention belongs to a novel catalyst and its preparation method, in particular to a manganese-cerium composite oxide catalyst with a hollow multi-shell microsphere structure and its preparation method. The catalyst has high denitrification catalytic activity at low temperature, It can be used for catalytic treatment of nitrogen oxides in coal-fired flue gas. Background technique [0002] The increasingly serious smog is the most serious environmental problem facing our country at present, which seriously threatens the healthy development of the national economy and the health and life safety of the people. Nitrogen oxides (NO x ) is one of the main pollutants causing smog. NO x It is extremely harmful, and its emission can lead to photochemical smog, acid rain, ozone layer damage, and cause great harm to human health and the ecological environment. With the continuous development of my country's economy, the emission of nitrogen oxides will co...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56
Inventor 石建稳刘畅牛春明
Owner XI AN JIAOTONG UNIV
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