Method for producing exhaust gas purifying filter, exhaust gas purifying filter, and exhaust gas purification device

A technology for exhaust gas purification and manufacturing methods, which is applied in the direction of chemical instruments and methods, exhaust devices, physical/chemical process catalysts, etc., and can solve problems such as the reduction of NOx reduction efficiency

Inactive Publication Date: 2018-03-27
OTSUKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When removing PM and NOx, once PM adheres to the NOx reduction catalyst, the NOx reduction efficiency will decrease, so it is necessary to install a NOx removal device downstream of the PM removal device

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] Next, the present invention will be described in more detail based on examples. The present invention is not limited to the following examples at all, and can be appropriately modified and implemented without changing the gist thereof.

[0061] [Zeolite]

Synthetic example 1

[0063] A slurry was prepared by mixing 1000 ml of a 10 mass % copper acetate aqueous solution and 400 g of a ZSM-5 type zeolite (HSZ-840NHA, manufactured by TOSOH Corporation), and stirring at 60° C. for 12 hours. The solid content of the obtained slurry was separated by filtration, washed with 1000 ml of ion-exchanged water, and then dried at 110° C. for 6 hours.

[0064] The obtained granular solid was measured by fluorescent X-rays, and it was confirmed that the ion-exchange sites of the zeolite were ion-exchanged to copper. However, the obtained zeolite was used in Example 16 and Comparative Example 3.

[0065] [Oxide]

Synthetic example 2

[0067] 32.3 parts by mass of sodium carbonate, 31.1 parts by mass of alumina, and 36.6 parts by mass of silicon oxide were mixed, and fired at 1200° C. for 4 hours. The obtained granular solid was confirmed to be NaAlSiO by X-ray diffraction 4 single phase.

[0068] 〔Manufacture of exhaust gas purification filter〕

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PUM

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Abstract

Provided is a method for producing an exhaust gas purifying filter, which enables the achievement of an exhaust gas purifying filter that has a high NOx reduction efficiency and supports a catalyst bymeans of a simple process without necessarily immersing an exhaust gas purifying filter after the production in a solution containing catalyst particles or applying the solution containing catalyst particles to the exhaust gas purifying filter after the production. A method for producing an exhaust gas purifying filter, which is characterized by comprising: a step for forming a molded body by extrusion molding a mixture that contains zeolite and staring material particles of a carrier; a step for forming a sintered body by firing the molded body; a step for subjecting the sintered body to analkali treatment at a pH of 9.5 or more; and a step for exchanging the element in the ion exchange site of zeolite contained in the sintered body after the alkali treatment with a transition metal.

Description

technical field [0001] The invention relates to a manufacturing method of an exhaust gas purification filter, an exhaust gas purification filter and an exhaust gas purification device. Background technique [0002] Exhaust gas from internal combustion engines such as diesel engines contains harmful components such as particulate matter (PM: particulate matter), nitrogen oxides (NOx), hydrocarbons, and carbon monoxide, and various methods are used to remove these harmful substances. In particular, NOx and PM discharged from diesel vehicles such as trucks and buses have become a cause of air pollution in cities, and regulations on these harmful substances have been gradually strengthened. [0003] For PM, there is a method of trapping PM in a filter arranged in the exhaust gas flow path, and when a predetermined amount of PM accumulates, heating the filter to burn and decompose PM, etc. to remove it. However, since the combustion temperature of PM is as high as 550 to 650° C....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/04B01D53/94B01J29/46B01J37/00B01J37/08B01J37/30F01N3/022F01N3/035
CPCF01N3/035B01J29/46F01N3/0222F01N2330/06F01N2370/24F01N2370/04F01N3/2066B01J2229/42B01J2229/38B01J2229/20B01J37/0207B01J29/072B01J29/24B01J29/146B01J29/63B01J29/7607B01J29/7615B01J37/0009B01D2255/20761B01D2257/404B01D2255/504B01D53/9418B01D2258/012B01D2255/915C04B35/478C04B2235/3427C04B2235/3281C04B2235/3201C04B2235/6562C04B2235/6567C04B2235/616C04B2235/449C04B2235/3472B01D53/94B01J29/06B01J29/40B01J35/04B01J37/0018F01N3/022B01J37/08B01J37/30B01J37/00B01J37/04B01D53/9413B01J21/063B01J2229/183F01N2510/063
Inventor 上谷昌稔三岛隆宽
Owner OTSUKA CHEM CO LTD
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