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Catalyst for lowering combustion temperature of soot in diesel exhaust gas and preparation method thereof

A technology of soot particles and combustion temperature, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve the problem of less research on eliminating soot particles, Achieve the effect of simple method, fast burning speed and easy operation

Inactive Publication Date: 2008-06-11
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reports on the elimination of NOx at home and abroad, but less research on the elimination of soot particles

Method used

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  • Catalyst for lowering combustion temperature of soot in diesel exhaust gas and preparation method thereof
  • Catalyst for lowering combustion temperature of soot in diesel exhaust gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 0.025 moles of lanthanum nitrate, 0.015 moles of cerium nitrate, 0.01 moles of potassium nitrate, 0.04 moles of nickel nitrate, 0.0075 moles of cobalt nitrate, 0.0025 moles of palladium nitrate, add 50 milliliters of deionized water, stir to dissolve, and then add 0.075 mole of citric acid was dissolved by stirring to obtain a viscous liquid. Put this liquid in an oven at 70°C and slowly evaporate until a viscous gel is obtained, then transfer it to a clean enamel dish, spread it evenly, add about 50 ml of absolute ethanol, and ignite it in the air Finally, the gel undergoes self-propagating combustion, and finally produces an extremely bulky dark brown powder. The obtained powder was collected, transferred to a crucible, placed in a muffle furnace, and fired at 850° C. for 18 hours.

[0027] Mix the above-mentioned catalyst and soot particles in a mass ratio of 9:1, grind them in an agate mortar for one hour, put them into a platinum crucible of a thermal analyz...

Embodiment 2

[0029] Weigh 0.025 moles of lanthanum nitrate, 0.015 moles of cerium nitrate, 0.01 moles of potassium nitrate, 0.04 moles of nickel nitrate, 0.0075 moles of cobalt nitrate, 0.0025 moles of palladium nitrate, add 50 milliliters of deionized water, stir to dissolve, and then add 0.075 mole of citric acid was dissolved by stirring to obtain a viscous liquid. Put this liquid in an oven at 70°C and slowly evaporate until a viscous gel is obtained, then transfer it to a clean enamel dish, spread it evenly, add about 50 ml of absolute ethanol, and ignite it in the air Finally, the gel undergoes self-propagating combustion, and finally produces an extremely bulky dark brown powder. The obtained powder was collected, transferred to a crucible, placed in a muffle furnace, and fired at 850° C. for 18 hours.

[0030] Mix the above-mentioned catalyst and soot particles in a mass ratio of 9:1, shake them evenly in a weighing bottle for one hour, put them in a fixed-bed reactor, and mix the...

Embodiment 3

[0032] Weigh 0.025 moles of lanthanum nitrate, 0.015 moles of cerium nitrate, 0.01 moles of potassium nitrate, 0.04 moles of nickel nitrate, 0.0075 moles of cobalt nitrate, 0.0025 moles of palladium nitrate, add 50 milliliters of deionized water, stir to dissolve, and then add 0.075 mole of citric acid was dissolved by stirring to obtain a viscous liquid. Put this liquid into a muffle furnace heated to 350°C, and the solution is burned to obtain a fluffy catalyst powder, which is then calcined at 850°C for 18 hours.

[0033] The combustion initiation temperature of the soot particles is measured according to Example 1, generally at 300°C-400°C. The combustion initiation temperature of the soot particles is measured according to Example 2, generally at 250°C-350°C.

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Abstract

The present invention relates catalyst to reduce burning temperature of carbon smoke particle in exhaust gas from diesel truck. Use LaNiO3 or La2NiO4base perovskite type composite oxide with B position atom of Ni as base, with assistant active constituent of kalium, cobalt, rare earth or palladium. It is prepared with sol-gal process or solution combustion method. It can reduce the burning temperature from 550Deg to 250~400Deg and satisfy low temperature require in the main; the burning speed enhances almost one times and very useful.

Description

(1) Technical field [0001] The invention relates to a catalyst capable of reducing the combustion temperature of soot particles in tail gas emitted by diesel vehicles and a preparation method of the catalyst. It belongs to the technical field of catalytic combustion. (2) Background technology [0002] Due to the characteristics of low fuel consumption, low emission and high power, diesel cars have a market share of 40% in Europe, and even as high as 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. The epoch-making significance is that in 2003, FAW-Volkswagen launched the first naturally aspirated diesel engine sedan Jetta SDI in the country. In February 2004, it launched another turbocharged diesel car Bora TDI....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01D53/94
Inventor 张昭良于鹏飞张业新耿浩然牟宗刚鲍猛
Owner UNIV OF JINAN
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