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Apparatus for removing particulate matter

a technology of particulate matter and apparatus, which is applied in the direction of physical/chemical process catalysts, metal/metal-oxide/metal-hydroxide catalysts, and separation processes, etc., can solve the problems of mounting a large apparatus onto a movable body, providing sufficient effect to reduce burning temperature, etc., and achieve and excellent oxygen releasing capacity

Inactive Publication Date: 2007-01-11
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] The present invention is made to overcome the above disadvantages, and one object of the present invention is to provide an apparatus for removing particulate matter which is able to decrease a combustion temperature of the particulate matter.
[0011] The inventors of the present invention have conducted a further study based on the knowledge above described, and found that perovskite-type complex oxide including an element having a valence of +3 as a metal for B of the general formula ABO3 can provide better oxygen releasing capacity, which leaded to the present invention.
[0013] An apparatus for removing particulate matter according to the present invention comprises a perovskite-type complex oxide which is represented by the general formula ABO3 where B is a metal having a valence of +3 or more, and the perovskite-type complex oxide can provide better oxygen releasing capacity than a conventional perovskite-type complex oxide including a metal having a valence of +2 for B.
[0015] The perovskite-type complex oxide has an excellent oxygen releasing capacity as described above, and can burn particulate matter including carbon, soot, hydrocarbon (HC) and the like at a temperature which is lower than a temperature conventionally required, by taking the advantage of supporting Pt or Pd.

Problems solved by technology

However, because the particulate matter is chemically more stable than the harmful gases, the catalysts cannot provide sufficient effect to decrease the burning temperature, and inconveniently, the purifying apparatus needs to be provided with a higher temperature atmosphere or to be of a larger size.
Such a higher temperature atmosphere for the purifying apparatus in turn requires a catalyst which is highly durable, and the purifying apparatus of a larger size causes a disadvantage of mounting a large apparatus onto a movable body such as automobile.

Method used

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  • Apparatus for removing particulate matter
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Examples

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example 1

[0028] First, in this example, equimolar quantities of lanthanum nitrate and manganese (III) nitrate, and four-fold molar excess of urea of a metal salt were dissolved in a small amount of water, and the solution was poured into a porcelain pot for a primary firing for two hours at 350° C. and further a secondary firing for one hour at 1000° C., which resulted in a perovskite-type complex oxide represented by LaMn(III)O3. Next, the temperature of the resulting perovskite-type complex oxide of this example was raised from an ambient temperature to 900° C. at the rate of 10° C. / minute in a vacuum of 1.33×10−5 Pa, and oxygen releasing capacity of the oxide was measured. The oxygen releasing capacity was determined, by measuring the oxygen which was desorbed during the above raise of temperature as a mass spectrum intensity of a mass-to-charge ratio (m / z)=32 with a mass analyzer. The result is shown in FIG. 1.

example 2

[0030] First, in this example, equimolar quantities of lanthanum nitrate, manganese (III) nitrate and strontium nitrate, and four-fold molar excess of urea of a metal salt were dissolved in a small amount of water, and the solution was poured into a porcelain pot for a primary firing for two hours at 350° C. and further a secondary firing for one hour at 1000° C., which resulted in a perovskite-type complex oxide represented by LaSrMn(II)O3. Next, the oxygen releasing capacity of the resulting perovskite-type complex oxide in this example was measured in the same manner as in Example 1. The result is shown in FIG. 2.

example 3

[0032] First, in this example, equimolar quantities of lanthanum nitrate and cobalt (III) nitrate, and four-fold molar excess of urea of a metal salt were dissolved in a small amount of water, and the solution was poured into a porcelain pot for a primary firing for two hours at 350° C. and further a secondary firing for one hour at 1000° C., which resulted in a perovskite-type complex oxide represented by LaCo(III)O3. Next, the oxygen releasing capacity of the resulting perovskite-type complex oxide in this example was measured in the same manner as in Example 1. The result is shown in FIG. 3.

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Abstract

An apparatus for removing particulate matter is provided which is able to lower a temperature to burn particulate matter. The apparatus for removing particulate matter burns and removes the particulate matter emitted from an internal combustion engine, and comprises a perovskite-type complex oxide which is represented by the general formula ABO3 where B is a metal having a valence of +3 or more. The metal having a valence of +3 or more for B of the general formula comprises at least one metal selected from the group consisting of Ti, Zr, Hf, V, Cr, Mo, W, Mn, Fe, Ru, Co, Ni, Cu, Ag, and Au. The perovskite-type complex oxide comprises at least one complex oxide selected from the group consisting of LaMn(III)O3, LaSrMn(III)O3, and LaCo(III)O3. The perovskite-type complex oxide supports Pt or Pd.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an apparatus for removing particulate matter which burns and removes particulate matter emitted from an internal combustion engine. [0003] 2. Description of the Related Art [0004] Conventionally, an oxidizing catalyst has been used, which is a mixture of refractory support such as alumina supporting a noble metal and oxygen storing material such as cerium oxide (ceria) for promoting oxidation, in order to purify harmful gases such as carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) which are emitted from an internal combustion engine such as an automobile engine and the like. Recently, the use of perovskite-type complex oxide also has been proposed to reduce and purify the nitrogen oxide (NOx) (for example, see Japanese Patent Laid-Open No. 2001-263051 publication). [0005] Meanwhile, particulate matter (particulate) including carbon, soot, and hydrocarbon (HC) as well ...

Claims

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Application Information

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IPC IPC(8): F01N3/10
CPCB01D53/944Y02T10/22B01D2255/1021B01D2255/1023B01D2255/402B01J23/002B01J23/34B01J23/6562B01J23/83B01J23/894B01J2523/00C01G1/02C01G45/1264C01G51/70C01P2002/34F01N3/022F01N2330/06F01N2510/065B01D53/945Y02T10/20B01J2523/3706B01J2523/845B01J2523/72B01J2523/828B01J2523/24Y02T10/12
Inventor TANAAMI, KIYOSHINAKA, TAKAHIRO
Owner HONDA MOTOR CO LTD
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