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Diesel vehicle exhaust carbon-smoke combustion and Nox storage-reduction dual-functional catalyst and its preparing method

A dual-function catalyst and soot combustion technology, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of low efficiency and achieve the effect of simple method and easy operation

Inactive Publication Date: 2008-07-02
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, diesel vehicle exhaust aftertreatment technologies mainly include: (1) Oxidation catalyst (DOC) that eliminates SOF in unburned HC, CO and particulate matter, which does not work on dry soot and NOx; (2) particulate matter capture that only eliminates particulate matter (3) lean-burn deNOx technology and catalysts that only eliminate NOx; (4) technologies that eliminate soot and NOx at the same time, such as composite oxide catalysts that can catalytically convert soot and NOx at the same time, that is, soot is oxidized to CO by NOx 2 At the same time NOx is reduced to N 2 , but in the case of a large amount of oxygen-enriched diesel engine, the reduction of NOx to N with soot 2 the efficiency is too low

Method used

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  • Diesel vehicle exhaust carbon-smoke combustion and Nox storage-reduction dual-functional catalyst and its preparing method
  • Diesel vehicle exhaust carbon-smoke combustion and Nox storage-reduction dual-functional catalyst and its preparing method
  • Diesel vehicle exhaust carbon-smoke combustion and Nox storage-reduction dual-functional catalyst and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Mg(NO 3 ) 2 .6H 2 O, Al(NO 3 ) 3 .9H 2 O and Cu(NO 3 ) 2 .6H 2 Mixed salt solution of O, Mg 2+ 、Al 3+ and Cu 2+ The total concentration of ions is 1.5mol / l, and the mixed alkaline solution of sodium carbonate and sodium hydroxide (CO 3 2- ): (OH - )=1:2, the two solutions are dripped into a 500ml beaker filled with a certain amount of deionized water at a certain rate of drop respectively (65°C of water temperature, 200ml of water yield), while stirring vigorously, adjust the rate of drop of the two solutions to make the pH value of the slurry Keep it around 10. After dripping, the resulting slurry was aged at 65°C for half an hour, then suction filtered, the filter cake was beaten and washed for half an hour, then suction filtered, and repeated several times. Finally, the filter cake was evaporated overnight at 120°C in an oven, and the evaporated filter cake was roasted in a horse-boiling furnace at different temperatures of 600°C.

[0026] Using equal ...

Embodiment 2

[0029] Mg(NO 3 ) 2 .6H 2 O, Al(NO 3 ) 3 .9H 2 O and Cu(NO 3 ) 2 .6H 2 Mixed salt solution of O, Mg 2+ 、Al 3+ and Cu 2+ The total concentration of ions is 1.5mol / l, and the mixed alkaline solution of sodium carbonate and sodium hydroxide (CO 3 2- ): (OH -)=1:2, the two solutions are dripped into a 500ml beaker filled with a certain amount of deionized water at a certain rate of drop respectively (65°C of water temperature, 200ml of water yield), while stirring vigorously, adjust the rate of drop of the two solutions to make the pH value of the slurry Keep it around 10. After dripping, the resulting slurry was aged at 65°C for half an hour, then suction filtered, the filter cake was beaten and washed for half an hour, then suction filtered, and repeated several times. Finally, the filter cake was evaporated overnight at 120°C in an oven, and the evaporated filter cake was baked in a horse boiling furnace at different temperatures of 600°C to obtain a copper-doped m...

Embodiment 3

[0033] Mg(NO 3 ) 2 .6H 2 O, Al(NO 3 ) 3 .9H 2 O and Cu(NO 3 ) 2 .6H 2 Mixed salt solution of O, Mg 2+ 、Al 3+ and Cu 2+ The total concentration of Gao Zi is 1.5mol / l, and the mixed alkali solution (CO 3 2- ): (OH - )=1:2, the two solutions are dripped into a 500ml beaker filled with a certain amount of deionized water at a certain rate of drop respectively (65°C of water temperature, 200ml of water yield), while stirring vigorously, adjust the rate of drop of the two solutions to make the pH value of the slurry Keep it around 10. After dripping, the resulting slurry was aged at 65°C for half an hour, then suction filtered, the filter cake was beaten and washed for half an hour, then suction filtered, and repeated several times. Finally, the filter cake was evaporated overnight at 120°C in an oven, and the evaporated filter cake was baked in a horse boiling furnace at different temperatures of 600°C to obtain a copper-doped magnesium-aluminum composite oxide.

[0...

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Abstract

The present invention relates to a double-function catalyst capable of making carbon smoke on the tail gas of diesel vehicle be burned and Nox be stored and reduced and its preparation method. Said ctalyst uses Mg-Al hydrotalcite composite oxide for loading Pt and K as basis, its auxiliary active component (adjuvant) is copper. Said catalyst is synthesized by adopting coprecipitation process. In the presence of said catalyst, it uses the simulant diesel vehicle tail gas as atmosphere it can simultaneously implement double function of making carbon smoke in said diesel vehicle tail gas be burned and Nox be stored and reduced.

Description

(1) Technical field [0001] The invention belongs to the technical field of diesel vehicle exhaust catalysts, and in particular relates to a dual-function catalyst capable of burning soot and storing and reducing NOx in exhaust gas of diesel vehicles, and a preparation method of the catalyst. (2) Background technology [0002] Due to the low fuel consumption, low emission and high power characteristics of diesel cars, the market share in Europe has reached 40%, and even up to 50% in Germany. Europe has adopted diesel engines as a means of implementing the "Kyoto Protocol" to reduce CO 2 Prerequisites for emissions. In my country's auto market, Nanjing Iveco uses diesel power for domestically produced light buses, and some light trucks and pickups are being replaced by diesel engines. It is of epoch-making significance that in 2003, FAW-Volkswagen launched the Jetta SDI, the first naturally aspirated diesel sedan in the country. In February 2004, it launched another turbocha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/04B01J23/42B01J32/00B01J37/02
Inventor 张昭良牟宗刚于鹏飞张业新倪献智鲍猛
Owner UNIV OF JINAN