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Novel low-temperature SCR (Selective Catalytic Reduction) catalyst based on tetragonal-phase zirconium oxide carrier and preparation method

A technology of SCR catalyst and phase zirconia, which is applied in the direction of physical/chemical process catalysts, catalyst carriers, chemical instruments and methods, etc., can solve the problems affecting texture, catalytic activity and catalytic selectivity, no one mentioned, and the existence of preparation technology Blank and other problems, to achieve the effect of improving catalytic activity, reducing preparation cost, and low loading capacity

Inactive Publication Date: 2014-11-05
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

because m -ZrO 2 , t -ZrO 2 and c -ZrO 2 The surface of ZrO has different acidity, alkalinity and hydroxyl density, ZrO 2 The crystal structure of the catalyst will significantly affect the texture, catalytic activity and catalytic selectivity of the catalytic active site of the supported catalyst, which will cause the catalytic activity of the catalyst in the chemical synthesis reaction and the selectivity of the chemical synthesis reaction, which is currently No one mentioned in the research results of catalysts for SCR
[0010] In summary, in the current research on the preparation technology of SCR catalysts with zirconia as the carrier, the preparation technology of controlling the carrier zirconia as a single crystal form There is a gap

Method used

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  • Novel low-temperature SCR (Selective Catalytic Reduction) catalyst based on tetragonal-phase zirconium oxide carrier and preparation method
  • Novel low-temperature SCR (Selective Catalytic Reduction) catalyst based on tetragonal-phase zirconium oxide carrier and preparation method
  • Novel low-temperature SCR (Selective Catalytic Reduction) catalyst based on tetragonal-phase zirconium oxide carrier and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take ZrOCl 2 ·8H 2 O(AR) is 15.388g, Y(NO 3 ) 3 ·6H 2 O(AR) is 0.5081g, PEG-4000(CP) is 0.32g, and it is configured as a mixed solution. Under the condition of rapid stirring, slowly drop 0.5mol / L ammonia solution into the prepared solution at a rate of 1mL / min until the pH=9.5, after aging for 12 hours, wash with water and alcohol (absolute ethanol, AR) Later until Cl - Removed, dried for 12 hours, and ground to obtain white precursor powder. The precursor powder was heated at a rate of 5°C / min without a protective atmosphere, kept at 650°C for 2 hours, and then naturally cooled to obtain tetragonal zirconia.

[0034] (2) Take 10g of tetragonal zirconia powder obtained in (1), 2.26mL of 50% manganese nitrate solution (Sinopharm, AR), Ce(NO 3 ) 3 ·6H 2 O is 2.5g, according to the equal-volume impregnation method, dissolved in deionized water, ultrasonically treated for 30min, impregnated for 6h under rapid stirring conditions, dried at 120°C for 12h, and he...

Embodiment 2

[0038] (1) Take ZrOCl 2 ·8H 2 O(AR) is 15.388g, Y(NO 3 ) 3 ·6H 2 O(AR) is 0.5081g, PEG-4000(CP) is 0.30g, and it is configured as a mixed solution. Under rapid stirring conditions, slowly drop 0.5mol / L ammonia solution into the prepared solution at a rate of 1mL / min until pH = 10, after aging for 24 hours, wash with water and alcohol (absolute ethanol, AR) Later until Cl - Removed, dried for 12 hours, and ground to obtain white precursor powder. The precursor powder was heated at a rate of 5°C / min without a protective atmosphere, kept at 650°C for 2 hours, and then naturally cooled to obtain a tetragonal zirconia powder.

[0039] (2) Take 10g of tetragonal zirconia powder obtained in (1), 1.13mL of 50% manganese nitrate solution (Sinopharm, AR), Ce(NO 3 ) 3 ·6H 2 O is 1.25g, according to the equal-volume impregnation method, dissolved in deionized water, ultrasonically treated for 30min, impregnated for 6h under rapid stirring conditions, dried at 120°C for 12h, and h...

Embodiment 3

[0043] (1) Take ZrOCl 2 ·8H 2 O(AR) is 15.871g, Y(NO 3 ) 3 ·6H 2 O(AR) is 0.4213g, PEG-4000(CP) is 0.28g, and it is configured as a mixed solution. Under the condition of rapid stirring, slowly drop 0.5mol / L ammonia solution into the prepared solution at a rate of 1mL / min until the pH=9.5, after aging and precipitation for 24 hours, wash with water and alcohol (absolute ethanol, AR) Later until Cl - Removed, dried for 12 hours, and ground to obtain white precursor powder. The precursor powder was heated at a rate of 5°C / min without a protective atmosphere, kept at 650°C for 2 hours, and then naturally cooled to obtain a tetragonal zirconia powder.

[0044] (2) Take 10g of tetragonal zirconia powder obtained in (1), 3.39mL of 50% manganese nitrate solution (Sinopharm, AR), Ce(NO 3 ) 3 ·6H 2 O is 3.75g, according to the equal-volume impregnation method, dissolved in deionized water, ultrasonically treated for 30min, impregnated for 6h under rapid stirring conditions, dr...

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Abstract

The invention belongs to the fields of environmental protection and environmental catalysis, and particularly relates to a novel low-temperature SCR (Selective Catalytic Reduction) catalyst based on a tetragonal-phase zirconium oxide carrier. In the catalyst, single tetragonal-phase zirconium oxide is taken as the carrier, and an oxide of manganese serving as an active component and an oxide of cerium serving as an aid are loaded, wherein the mass percentage of the tetragonal-phase zirconium oxide is 50-95 percent, the mass percentage of the oxide of manganese is 2.5-25 percent, and the mass percentage of the oxide of cerium is 2.5-25 percent. By taking the tetragonal-phase zirconium oxide as the carrier, the specific performance of the carrier can be brought into full play; and meanwhile, the denitration activity of the catalyst is increased through interaction with MnOx and CeOx. The catalyst prepared through a preparation method provided by the invention shows high catalytic activity in a temperature range 60-180 DEG C by taking ammonia as a reducing agent.

Description

technical field [0001] The invention relates to the fields of environmental protection and environmental catalysis, in particular to a novel tetragonal zirconia-based low-temperature flue gas denitrification SCR catalyst and a preparation method. Background technique [0002] Nitrogen oxides (NO x ) is the main air pollutant, which can cause acid rain, photochemical smog, greenhouse effect and the destruction of the ozone layer, and also has serious harm to human health. Since 2000, the rapid development of coal-fired power plants in my country has greatly increased the emission of nitrogen oxides and aggravated air pollution. On January 1, 2012, the new "Emission Standards of Air Pollutants for Thermal Power Plants" required NO x The emission concentration is lower than 100mg / m 3 , put forward the new requirements for the emission reduction of nitrogen oxides in coal-fired power plants in my country, and effectively reducing the emission of nitrogen oxides in coal-fired ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J32/00B01J35/10B01D53/86B01D53/56
Inventor 刘荣管昊叶飞贡湘君
Owner NANJING NORMAL UNIVERSITY
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