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Method of producing a catalysed particulate filter and filter thus obtained

A particle filter and production method technology, applied in the direction of dispersed particle filtration, chemical instruments and methods, filtration separation, etc., can solve problems such as clogging, pressure loss increase, engine performance loss, etc.

Inactive Publication Date: 2007-08-15
RHODIA CHEM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the gradual accumulation in the filter, soot causes firstly an increase in pressure loss and secondly the appearance of clogging, which leads to a loss of engine performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] This example relates to the preparation of a composition based on oxides of cerium and zirconium, the mass ratio of each oxide being 58% and 42%, and the composition shows the characteristics of the present invention.

[0102] Introduce 525 ml of zirconium nitrate (80 g / l) and 245 ml of ceric nitrate solution (Ce 4+ =236.5g / l, Ce 3+ = 15.5 g / l, free acidity = 0.7N). The volume was subsequently replenished with distilled water to obtain 1 liter of nitrate solution.

[0103] Into the stirred reactor was introduced 253 ml of aqueous ammonia solution, followed by volume up with distilled water to bring the total volume to 1 liter.

[0104] With constant stirring, the nitrate solution was introduced into the reactor within one hour.

[0105] The resulting solution was placed in a stainless steel autoclave equipped with a stirrer. With stirring, the temperature of the medium was raised to 150° C. within 2 hours.

[0106] The suspension thus obtained was then filtered on ...

Embodiment 2

[0115] Embodiment 2 (comparison)

[0116] This example relates to the preparation of a composition based on oxides of cerium and zirconium, the mass ratio of each oxide being 58% and 42%, and the composition does not show the porosity characteristic of the present invention.

[0117] The starting solution consisted of a mixture of cerium(IV) nitrate and zirconium nitrate in weight ratios of 58% and 42% of the respective oxides.

[0118] A zirconium solution is obtained by treating zirconium carbonate with concentrated nitric acid. Such a solution is such that during the quantitative determination of the acid / base of this solution, the amount of base necessary to obtain the equivalence point satisfies the OH - Conditions where the / Zr molar ratio is 0.85.

[0119] Acid / base quantification is carried out in a known manner. In order to carry out the determination under optimal conditions, the concentration expressed as zirconium element can be quantitatively determined to be a...

Embodiment 3

[0127] This example relates to the preparation of a composition based on oxides of cerium, zirconium, lanthanum and neodymium, the mass proportions of each oxide being 21%, 72%, 2% and 5%, and the composition shows the characteristics of the present invention .

[0128] Into a stirred beaker were introduced 900 ml of zirconium nitrate (80 g / l), 42.3 ml of cerium nitrate (oxidation state III) (496 g / l), 4.4 ml of lanthanum nitrate (454 g / l) and 9.5 ml of neodymium nitrate ( 524g / l). It was then supplemented with distilled water to obtain 1 liter of a solution of these nitrates.

[0129] 250 ml of aqueous ammonia solution (12 mol / l) and 74 ml of hydrogen peroxide (110 volumes) were introduced into the stirred reactor, followed by replenishment with distilled water to bring the total volume to 1 liter.

[0130] The nitrate solution was introduced into the reactor within one hour under constant stirring to obtain a suspension.

[0131] The obtained suspension was placed in a st...

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PUM

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Abstract

The invention relates to a method of producing a catalysed particulate filter. The invention is characterised in that, in order to lower the particulate oxidation temperature, the filter is provided with a cerium oxide, a zirconium oxide or a cerium / zirconium mixed oxide which can also comprise at least one rare earth oxide other than cerium. The porosity of said oxide or mixed oxide is such that at least 80 % of the pore volume comprises pores having a diameter of least 20 nm.

Description

technical field [0001] The invention relates to a method for the production of a catalyzed particle filter and the filter obtained therefrom. Background technique [0002] During the combustion of hydrocarbon fuels, among their combustion products, carbonaceous or hydrocarbonaceous products form carbonaceous particles, which are also denoted by the word "soot" in the following description, known to be harmful to the environment and to health. is harmful. The emission of these soot must therefore be reduced. [0003] The most commonly adopted technology for this purpose is to equip the exhaust system with a particulate filter capable of blocking all or a high proportion of carbonaceous particles produced by the combustion of various fuels. [0004] However, due to the gradual accumulation in the filter, the soot causes firstly an increase in pressure loss and secondly the appearance of clogging, which leads to a loss of engine performance. The soot collected by these filte...

Claims

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Application Information

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IPC IPC(8): B01J21/06F01N3/035B01J23/10
CPCB01D39/2093B01J23/10B01J35/1014B01J37/03Y10T428/249978F01N3/035B01J37/0018F01N2510/065B01J21/066B01J35/108B01J35/613B01J35/66B01D46/42B01J21/06
Inventor S·韦迪耶
Owner RHODIA CHEM SA
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