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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  • Description
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  • Application Information

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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 substance

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

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Example Embodiment

[0018] Example 1:

[0019] (1) prepare the mixed solution 20ml containing Ce ion and Mn ion, wherein Ce ion concentration is 0.029mol / L, Mn ion concentration is 0.019mol / L, simultaneously prepare the glucose solution 60ml of 0.53mol / L, then mixed solution is added Stir well into the glucose solution;

[0020] (2) the homogeneous solution was transferred into the reactor, and hydrothermally reacted for 20 hours under the condition of 180°C;

[0021] (3) After naturally cooling to room temperature, the products of the hydrothermal reaction were 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 microspheres Mn:(Mn+Ce)=0.4, the diameter of the microspheres is 3μm after testing, and the specific surface area is 180m 2 / g. The catalyst activity test uses a fixed bed reactor, and the composi...

Example Embodiment

[0023] Example 2:

[0024] (1) prepare the mixed solution 20ml containing Ce ion and Mn ion, wherein Ce ion concentration is 0.029mol / L, Mn ion concentration is 0.067mol / L, simultaneously prepare the glucose solution 60ml of 0.53mol / L, then mixed solution is added Stir well into the glucose solution;

[0025] (2) the homogeneous solution was transferred into the reactor, and hydrothermally reacted for 20 hours under the condition of 180°C;

[0026] (3) After naturally cooling to room temperature, the products of the hydrothermal reaction were 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 microspheres Mn:(Mn+Ce)=0.7, the diameter of the microspheres is 2.5μm after testing, and the specific surface area is 112m 2 / g. The catalyst activity test uses a fixed bed reactor, and the compo...

Example Embodiment

[0028] Example 3:

[0029] (1) prepare 20ml of mixed solution containing Ce ion and Mn ion, wherein Ce ion concentration is 0.029mol / L, Mn ion concentration is 0.0072mol / L, simultaneously prepare 0.53mol / L glucose solution 60ml, then mixed solution is added into the glucose solution and stir well;

[0030] (2) the homogeneous solution was transferred into the reactor, and hydrothermally reacted for 20 hours under the condition of 180°C;

[0031] (3) After naturally cooling to room temperature, the products of the hydrothermal reaction were 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.

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

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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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