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Application of ternary metal modified titanium dioxide catalyst in removing nitric oxide in tail gas of diesel engine

A titanium dioxide and ternary metal technology, applied in the field of catalysts for diesel engines, can solve the problems of high cost, great harm to human health, poor low-temperature activity, etc., and achieve the effects of convenient operation, excellent SCR performance, and improved low-temperature activity.

Inactive Publication Date: 2015-05-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing V 2 o 5 -WO 3 (or MoO 3 )-TiO 2 Commercial SCR catalysts are expensive and have poor low-temperature activity; at the same time, V 2 o 5 It is a highly toxic substance that is harmful to human health

Method used

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  • Application of ternary metal modified titanium dioxide catalyst in removing nitric oxide in tail gas of diesel engine
  • Application of ternary metal modified titanium dioxide catalyst in removing nitric oxide in tail gas of diesel engine
  • Application of ternary metal modified titanium dioxide catalyst in removing nitric oxide in tail gas of diesel engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 1.87g copper acetate (molecular formula: C 4 h 6 CuO 4 ·H 2 O; molecular weight: 199.65), 1.49g cerium nitrate (molecular formula: Ce(NO 3 ) 3 ·6H 2 O; molecular weight: 434.23), 3.29g zirconium nitrate (molecular formula: Zr(NO 3 ) 2 ; Molecular weight: 429.33) was dissolved in 300ml deionized water, then weighed 20g anatase TiO 2 Add the powder to the mixed solution of copper acetate and zirconium nitrate, adjust the pH value of the solution to 6.0, reflux and stir in a water bath at 70°C for 22 hours, and perform ion exchange;

[0027] (2) Continue heating and stirring the mixed solution after ion exchange at 70° C. until the water in the liquid is evaporated to dryness;

[0028] (3) Dry the solid powder evaporated to dryness after ion exchange at 110°C for 12 hours, and then roast according to the following steps: at a rate of 8°C / min from room temperature 20°C to 500°C, keep the temperature constant for 5 hours, and cool with the furnace to Room ...

Embodiment 2

[0032] (1) Weigh 2.5g copper acetate (molecular formula: C 4 h 6 CuO 4 ·H 2 O; molecular weight: 199.65), 0.62g cerium nitrate (molecular formula: Ce(NO 3 ) 3 ·6H 2 O; molecular weight: 434.23), 2.82g zirconium nitrate (molecular formula: Zr(NO 3 ) 4 ·5H 2 O; molecular weight: 429.33) was dissolved in 300ml deionized water, then weighed 20g anatase TiO 2 Add the powder to the mixed solution of copper acetate and zirconium nitrate, adjust the pH value of the solution to 7.0, reflux and stir in a water bath at 80°C for 24 hours, and perform ion exchange;

[0033] (2) Continue heating and stirring the mixed solution after ion exchange at 70° C. until the water in the liquid is evaporated to dryness;

[0034] (3) Dry the evaporated solid powder at 90°C for 24 hours after ion exchange, and then roast according to the following steps: from room temperature 25°C to 600°C at a rate of 10°C / min, keep the temperature constant for 3 hours, and cool with the furnace to Room temp...

Embodiment 3

[0038] (1) Weigh 2.5g copper acetate (molecular formula: C 4 h 6 CuO 4 ·H 2 O; molecular weight: 199.65), 1.24g cerium nitrate (molecular formula: Ce(NO 3 ) 3 ·6H 2 O; molecular weight: 434.23), 1.88g zirconium nitrate (molecular formula: Zr(NO 3 ) 4 ·5H 2 O; molecular weight: 429.33) was dissolved in 300ml deionized water, then weighed 20g anatase TiO 2 Add the powder to the mixed solution of copper acetate and zirconium nitrate, adjust the pH value of the solution to 6.5, reflux and stir in a water bath at 80°C for 20 hours, and perform ion exchange;

[0039] (2) Continue heating and stirring the mixed solution after ion exchange at 80° C. until the water in the liquid is evaporated to dryness;

[0040] (3) Dry the evaporated solid powder at 100°C for 20h after ion exchange, and then roast according to the following steps: at a rate of 9°C / min from room temperature 22°C to 550°C, keep the temperature constant for 4h, and cool with the furnace to Room temperature 22...

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Abstract

The invention discloses application of a ternary metal modified titanium dioxide catalyst in removing nitric oxide in tail gas of a diesel engine. Anatase type titanium dioxide is selected as a base body, and three elements including copper, cerium and zirconium are loaded onto the anatase type titanium dioxide base body; the anatase type titanium dioxide base body comprises the three elements in percentage by weight: 3-5% of the copper element, 0.5-3.5% of the cerium elements, and 0.5-3.5% of the zirconium element, and the sum of the cerium and zirconium elements is 4%. According to the application, not only is the biological toxicity of the original SCR catalyst reduced, but also the ternary metal modified titanium dioxide catalyst has the wide activity temperature window, and shows the excellent SCR performance at 165-450 DEG C; the low-temperature activity is improved greatly; the ternary metal modified titanium dioxide catalyst can be applied to the treatment of NOx in the tail gas of the diesel engine; a preparation process is simple; the operation is convenient; the cost is low; the ternary metal modified titanium dioxide catalyst can meet and achieve the standard of tail gas purification of motor vehicles and the need of practical needs.

Description

[0001] The present invention application is a divisional application of the invention application (parent application) "Ternary metal-modified titanium dioxide catalyst and its preparation method and its application in the removal of nitrogen oxides in diesel engine exhaust". The application number of the parent application is 2013103863874. The date is August 29, 2013. technical field [0002] The invention belongs to catalysts for diesel engines, in particular to TiO modified by copper, cerium and zirconium elements 2 Selective catalytic reduction, removal of NO x Catalysts and their preparation methods and applications. Background technique [0003] Diesel engines have the advantages of high power, good fuel economy, high thermal efficiency and good reliability, and are widely used in transportation, industrial and agricultural production and other fields. In recent years, as far as the world is concerned, automobile dieselization has become an irreversible trend. Howe...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01D53/56B01J23/83
CPCY02A50/20Y02T10/12
Inventor 龚彩荣孙晓亮吕刚宾峰宋崇林
Owner TIANJIN UNIV