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Novel low-temperature SCR (selective catalytic reduction) catalyst based on cubic-phase zirconia carrier and preparation method of novel low-temperature SCR catalyst

A technology of SCR catalyst and phase zirconia, which is applied in the field of cubic phase zirconia-based low-temperature flue gas denitrification SCR catalyst and its preparation, which can solve the gaps in preparation technology that no one mentioned, affecting texture, catalytic activity and catalytic selectivity, and preparation technology and other problems, to achieve the effect of improving the uniformity, reducing the preparation cost, and controlling the problem of agglomeration

Active Publication Date: 2014-09-17
NANJING DONGYAO RES INST OF ARCHITECTURAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 cubic-phase zirconia carrier and preparation method of novel low-temperature SCR catalyst
  • Novel low-temperature SCR (selective catalytic reduction) catalyst based on cubic-phase zirconia carrier and preparation method of novel low-temperature SCR catalyst
  • Novel low-temperature SCR (selective catalytic reduction) catalyst based on cubic-phase zirconia carrier and preparation method of novel low-temperature SCR catalyst

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 0.862g, 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 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 and calcined for 2 hours, and then naturally cooled to obtain cubic zirconia.

[0034] (2) Take the cubic phase zirconia powder obtained in (1) as 10g, 50% manganese nitrate solution (Sinopharm, AR) as 2.26mL, 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, ...

Embodiment 2

[0038] (1) Take ZrOCl 2 ·8H 2 O(AR) is 15.388g, Y(NO 3 ) 3 ·6H 2 O(AR) is 0.862g, 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 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 and calcined for 2 hours, and then naturally cooled to obtain a cubic phase zirconia powder.

[0039] (2) Take 10g of cubic 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 condit...

Embodiment 3

[0043] (1) Take ZrOCl 2 ·8H 2 O(AR) is 15.388g, Y(NO 3 ) 3 ·6H 2 O(AR) is 0.862g, 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 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 and calcined for 2 hours, and then naturally cooled to obtain a cubic phase zirconia powder.

[0044] (2) Take 10g of cubic 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 condit...

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Abstract

The invention belongs to the field of environmental protection and environmental catalysis, and in particular discloses a novel low-temperature SCR (selective catalytic reduction) catalyst based on a cubic-phase zirconia carrier and a preparation method of the novel low-temperature SCR catalyst. According to the catalyst, single cubic-phase zirconia serves as a carrier, load active components are manganese oxides, and aids are cerium oxides, wherein the cubic-phase zirconia accounts for 50-95 mass percent, the manganese oxides account for 2.5-25 mass percent, and the cerium oxides account for 2.5-25 mass percent. The cubic-phase zirconia serves as the carrier, so that the specific performance of the carrier can be fully utilized; by virtue of interaction between the carrier and MnOx and CeOx, the denitration activity of the catalyst is improved. The catalyst prepared by the preparation method shows good catalytic activity under the conditions that ammonia serves as a reducing agent and the temperature is 60-180 DEG C.

Description

technical field [0001] The invention relates to the fields of environmental protection and environmental catalysis, in particular to a novel cubic-phase 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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
Inventor 刘荣管昊叶飞贡湘君徐悦清
Owner NANJING DONGYAO RES INST OF ARCHITECTURAL TECH CO LTD
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