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Method of producing a catalyzed particulate filter and filter thus obtained

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

Inactive Publication Date: 2009-10-28
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 performed 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 ab...

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 (524 g / 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 s...

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Abstract

The invention relates to a method for the production of a catalytic particle filter, characterized in that, in order to lower the oxidation temperature of the particles, cerium oxide, zirconium oxide or a mixed oxide of cerium and zirconium is used to introduce it into the filter, the cerium and zirconium The mixed oxide may additionally include at least one oxide of a rare earth element other than cerium. The porosity of such oxides or mixed oxides is such that at least 80% of the pore volume consists of pores with a diameter at least equal to 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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06F01N3/035B01J23/10
CPCB01D39/2093B01J23/10B01J35/1014B01J37/03Y10T428/249978F01N3/035B01J37/0018F01N2510/065B01J21/066B01J35/108B01D46/42B01J21/06
Inventor S·韦迪耶
Owner RHODIA CHEM SA
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