EP2533878A1 - Filtre a particules comprenant une phase catalytique - Google Patents
Filtre a particules comprenant une phase catalytiqueInfo
- Publication number
- EP2533878A1 EP2533878A1 EP11708906A EP11708906A EP2533878A1 EP 2533878 A1 EP2533878 A1 EP 2533878A1 EP 11708906 A EP11708906 A EP 11708906A EP 11708906 A EP11708906 A EP 11708906A EP 2533878 A1 EP2533878 A1 EP 2533878A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- particle filter
- zirconia
- catalytic phase
- filter according
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
Definitions
- Particle filter comprising a catalytic phase.
- the present invention relates to the field of particle filters used in an exhaust line of an engine for the removal of particles.
- the pollutants resulting from the combustion of a Diesel engine or gasoline are mainly unburned hydrocarbons (HC), nitrogen oxides (nitrogen monoxide NO and nitrogen dioxide N0 2 ), carbon oxides (carbon monoxide CO and carbon dioxide C0 2 ), and in the case of diesel engines and gasoline direct injection engines, carbonaceous particles, which will be referred to in the rest of the description as "soot".
- the post-treatment of the soot particles can be achieved by the introduction of a particulate filter into the exhaust line of the internal combustion engine.
- Particle filters used in the automotive field most often include porous ceramic matrices incorporating many channels.
- the particulate filter is subjected to a succession of filtering phase, during which the soot particles contained in the exhaust gases are deposited and accumulate in the particulate filter, and Regeneration phase to remove soot by auto-ignition and thus maintain its full effectiveness.
- Catalytic Particle Filter Such a device is composed of a particle filter and a catalytic phase deposited in the porosity of the filter walls of the filter. These catalytic phases are either based on platinum deposited on supports such as alumina or cerium-zirconium oxides, or based on mixed oxides, such as, for example, cerium-zirconium-praseodymium ternary oxides.
- the invention aims to overcome the drawback of the prior art by proposing a new economical particle filter, effective at low temperature, and to overcome the problem of vehicle integration of additional mechanical members.
- the invention therefore relates to a particulate filter for purifying the exhaust gases produced by an internal combustion engine comprising a porous ceramic filtering substrate and a catalytic phase, characterized in that the catalytic phase is based on yttria-containing zirconia. .
- the invention may include one or more of the following features:
- the catalytic phase based on yttria-containing zirconia comprises a molar percentage of yttrine in the zirconia of between 3 and 12 mol%, for a better ionic conductivity and more preferably the molar percentage of yttrine in the zirconia is 8 mol%, for good efficiency of particulate filter from low temperatures, as shown in this memoir.
- the particulate filter of the invention may comprise an amount of catalytic phase based on zirconia ytrtriée of between 50 g / liter and 500 g / liter of particulate filter and preferably between 80 g / liter and 250 g / liter.
- the ceramic substrate is selected from silicon carbide, alumina, aluminum titanate, cordierite, for the sake of economy.
- At least a portion of the catalytic phase based on yttria-containing zirconia is deposited in the porosity of the ceramic filtering substrate.
- the particulate filter comprising exhaust gas inlet channels, at least a part of the catalytic phase based on yttria zirconia is deposited on the surface of the inlet channels of said filter.
- the particulate filter of the invention is capable of regenerating itself by combustion of the particles contained in said filter as soon as it substantially reaches a temperature of 300 ° C. in order to be able to be operational quickly after starting the engine.
- the invention also relates to an exhaust line, characterized in that it comprises a particulate filter according to any one of the preceding claims.
- FIG. 1 is a diagram of the internal structure of a particulate filter.
- FIG. 2 is a graph showing the evolution of the pressure drop of a particle filter according to the prior art during a regeneration phase.
- FIG. 3 is a graph showing the evolution of the pressure drop of a particle filter of the invention. detailed description
- FIG. 1 schematically recalls the internal structure known per se of a particle filter 1.
- a particulate filter generally comprises a porous ceramic substrate or support having parallel channels 2. The latter are obstructed alternately by ceramic plugs 3 so as to force the exhaust gas whose direction of flow is illustrated by the arrows 4 to enter through inlet channels 2a, then through the porous dividing walls 5 to come out by exhaust gas outlet channels 2b.
- Particle filter A is a particle filter known from the prior art and described in particular in document WO20091 18814.
- Particle filter A comprises a silicon carbide ceramic support, SiC, of 400 cpsi (designating the number of channels). per square inch, or 62 channels per cm 2 ).
- Particle filter A does not comprise a catalytic phase deposited in the porosity of the ceramic support.
- the particulate filter B of the invention comprises a silicon carbide ceramic support and a catalytic phase based on yttria zirconia, that is to say zirconia Zr0 2 containing yttrium in the form of yttrine of chemical formula Y 2 0 3 .
- Yttria zirconia can contain trace amounts of compounds such as chlorine, present in our embodiment up to 600 ppm.
- the catalytic phase is deposited in the porosity of the porous separating walls by the forcing method still referred to as "slurry forcing method".
- the particulate filter B of the invention may contain an active phase mass per particle volume of particulate filter of between 50 g / liter and 500 g / liter of particulate filter.
- the amount of catalytic phase deposited in the particulate filter of the invention is between 80 g / liter and 250 g / liter of particulate filter. More preferably, as in this embodiment, whose performance is evaluated below, the amount of catalytic phase deposited in the particle filter B of the invention is set at 180 g of yttriated zirconia per liter of particulate filter.
- the mole percent yttria Y 2 0 3 in the zirconia Zr0 2 may vary from 1 to 25%.
- molar percentage of yttrine Y 2 O 3 in zirconia ZrO 2 is meant here the ratio, expressed as a percentage of the number of moles of yttrine Y 2 0 3 , relative to the number of moles of zirconia ZrO 2 in the catalytic phase.
- the catalytic phase of the particle filter B is a yttria stabilized zirconia consisting of a mole percent yttria Y 2 0 3 in the zirconia Zr0 2 between 3 and 10 mol% in order to obtain the best ionic conductivities.
- the catalytic phase of the particle filter B is an yttria-containing zirconia composed of a molar percentage of yttrine Y 2 O 3 in the zirconia of 8%.
- particulate filters A and B are evaluated by following an evaluation protocol consisting of two phases:
- regeneration refers to the fact that the carbonaceous particles contained in the filter burn up as soon as the inlet temperature of the gases in the filter reaches a critical threshold. A decrease in the pressure drop in the filter is observed when the filter regenerates by combustion of the carbonaceous particles.
- a 2.5 cm by 7.5 cm (1 inch by 3 inch) particle filter core having a gas inlet face and a gas outlet face is installed downstream.
- a CAST brand burner The CAST is a burner whose flame is cut in order to generate carbon particles.
- the flame is generated from the combustion of propane.
- the temperature of the gas flowing into the particulate filter cores A and B is then brought from 240-450 ⁇ linear programming temperature of 20 ° C / min between 240 and 360 ° C and 5 ⁇ € / min 360 at 450 ° C.
- the pressure drop ⁇ in the particulate filter is measured continuously, using pressure sensors placed upstream and downstream of the particle filter core, during the entire duration of the loading and regeneration.
- FIG. 2 presents, in the form of a diagram, the evolution of the pressure drop ⁇ as a function of the programming time of the temperature of the gases entering the A particle filter core of the prior art.
- the reference 6 designates the evolution curve of the pressure drop ⁇
- the reference 7 designates the evolution curve of the temperature T in A at the inlet face of the particulate filter A
- the reference 8 designates the curve evolution of the oven temperature.
- FIG. 2 presents, in the form of a diagram, the evolution of the pressure drop ⁇ as a function of the programming time of the temperature of the gases entering the particle filter core B of the invention.
- the reference 9 designates the evolution curve of the pressure drop ⁇
- the reference 10 designates the evolution curve of the temperature T in B at the inlet face of the particulate filter B
- the reference 11 denotes the temperature evolution curve T 0UtB at the outlet face of the particle filter B of the invention.
- the temperature criterion chosen for the comparison of the performance of the particulate filters is the temperature of the particle filter taken at the input of it because it is the place as shown in Figures 2 and 3 where the temperature of the filter is minimum.
- the ceramic substrate may be chosen from common ceramics which are therefore economical, such as alumina, aluminum titanate and cordierite.
- the catalytic phase based on yttria zirconia is deposited on the surface of the gas inlet channels of the particulate filter.
- the catalytic phase can then be deposited by a soaking process (deep-coating) in a slip.
- the catalytic phase based on yttriated zirconia is deposited both in the porosity of the ceramic support and on the surface of the inlet channels 2 of the gases of the particulate filter 1.
- the invention has the advantage of providing a catalytic particle filter containing no noble metals such as platinum, palladium or rhodium and which has the particularity to regenerate by burning soot as soon as the filter substantially reaches a temperature T in B. filter inlet of the order of 300 ° C.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Filtering Materials (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1050988A FR2956329B1 (fr) | 2010-02-12 | 2010-02-12 | Filtre a particules comprenant une phase catalytique |
PCT/FR2011/050260 WO2011098718A1 (fr) | 2010-02-12 | 2011-02-08 | Filtre a particules comprenant une phase catalytique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2533878A1 true EP2533878A1 (fr) | 2012-12-19 |
Family
ID=42667909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11708906A Withdrawn EP2533878A1 (fr) | 2010-02-12 | 2011-02-08 | Filtre a particules comprenant une phase catalytique |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2533878A1 (fr) |
FR (1) | FR2956329B1 (fr) |
WO (1) | WO2011098718A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3039079B1 (fr) * | 2015-07-23 | 2020-04-03 | Psa Automobiles Sa. | Filtre a particules catalyse |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2868768A1 (fr) * | 2004-04-07 | 2005-10-14 | Rhodia Chimie Sa | Composition a base d'oxydes de zirconium et d'ytrium, procede de preparation et utilisation dans un systeme catalytique |
EP2045011A1 (fr) * | 2006-07-12 | 2009-04-08 | Toyota Jidosha Kabushiki Kaisha | Particule porteuse catalytique, son procédé de fabrication et catalyseur de purification de gaz d'échappement |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2678436A (en) | 1951-02-21 | 1954-05-11 | Int Standard Electric Corp | Polarized alternating current ringer or buzzer for telephone subsets and similar apparatus |
JP2005262184A (ja) * | 2004-03-22 | 2005-09-29 | Mazda Motor Corp | ディーゼルパティキュレートフィルタ |
US8067330B2 (en) * | 2007-02-15 | 2011-11-29 | Mazda Motor Corporation | Catalytic material and catalyst for purifying exhaust gas component |
WO2009118814A1 (fr) | 2008-03-24 | 2009-10-01 | イビデン株式会社 | Filtre en nid d'abeilles |
-
2010
- 2010-02-12 FR FR1050988A patent/FR2956329B1/fr not_active Expired - Fee Related
-
2011
- 2011-02-08 EP EP11708906A patent/EP2533878A1/fr not_active Withdrawn
- 2011-02-08 WO PCT/FR2011/050260 patent/WO2011098718A1/fr active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2868768A1 (fr) * | 2004-04-07 | 2005-10-14 | Rhodia Chimie Sa | Composition a base d'oxydes de zirconium et d'ytrium, procede de preparation et utilisation dans un systeme catalytique |
EP2045011A1 (fr) * | 2006-07-12 | 2009-04-08 | Toyota Jidosha Kabushiki Kaisha | Particule porteuse catalytique, son procédé de fabrication et catalyseur de purification de gaz d'échappement |
Non-Patent Citations (1)
Title |
---|
See also references of WO2011098718A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2956329B1 (fr) | 2014-08-15 |
WO2011098718A1 (fr) | 2011-08-18 |
FR2956329A1 (fr) | 2011-08-19 |
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Effective date: 20160304 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Owner name: PSA AUTOMOBILES SA Owner name: UNIVERSITE CLAUDE BERNARD LYON 1 |
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