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Exhaust gas purifying catalyst

A technology for exhaust gas purification and catalyst, which is applied in physical/chemical process catalysts, catalyst activation/preparation, chemical elements of heterogeneous catalysts, etc. It can solve the problem that catalysts cannot fully exert the performance of purification catalysts, and achieve sintering inhibition and stable purification performance. , the effect of improving durability

Inactive Publication Date: 2016-11-09
MITSUI MINING & SMELTING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if only the air-fuel ratio (A / F) is controlled in this way, the catalyst cannot fully exert the purification catalyst performance, so the function of controlling the air-fuel ratio (A / F) is also required for the catalyst layer itself

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Dissolve iron (II) nitrate (9 hydrate), cerium (III) nitrate (6 hydrate), and cobalt nitrate in hot water at 90°C or higher in an amount equivalent to the amount of water supplied to alumina, and add them while stirring Put into a container with alumina powder heated to 100°C.

[0113] At this time, the mass of iron (II) nitrate (9 hydrate), cerium (III) nitrate (6 hydrate), cobalt nitrate (6 hydrate) and alumina powder used was adjusted to iron (II) nitrate ( The mass of the iron atom contained in the 9 hydrate) is 2 at %, the mass of the cerium atom contained in the cerium (III) nitrate (6 hydrate) is 18 at %, the cobalt contained in the cobalt nitrate (6 hydrate) The mass of atoms is 2 at%, the mass of alumina is 78 at%, and the total is 100 at%.

[0114] Next, after drying at 120° C., it was fired at 500° C. for 3 hours, and then pulverized using a mortar to obtain a catalyst composition powder (sample).

Embodiment 2-7、 comparative example 2-4

[0116] In Example 1, except that the nitrates of various M elements shown in Table 1 were used instead of cobalt, catalyst powder was produced in the same manner as in Example 1 to obtain a catalyst composition powder (sample).

Embodiment 8-15、 comparative example 5

[0118] In Example 1, except that the blending amounts of cobalt, cerium, iron, and alumina were changed as shown in Table 2, catalyst powder was produced in the same manner as in Example 1, and a catalyst composition was obtained. powder (sample).

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Abstract

Provided is an exhaust gas purifying catalyst which contains catalyst particles having a configuration in which iron (Fe), cerium (Ce), and a precious metal, and one or two or more kinds of elements (referred to as the M element) among cobalt (Co), manganese (Mn), copper (Cu), nickel (Ni), magnesium (Mg), lanthanum (La), and strontium (Sr) are supported on inorganic porous support particles, and in which catalyst particles having a configuration in which Ce is present at 1 at % or more, Fe is present at 0.1 at % or more, and the M element is present at 0.1 at % or more account for 80 or more when 100 of catalyst particles having a particle diameter of 6 Miu or more are randomly selected and each of these catalyst particles is quantitatively mapped by EDX.

Description

technical field [0001] The present invention relates to an exhaust gas purification catalyst which can be used for purification of exhaust gas discharged from an internal combustion engine. Background technique [0002] Gasoline-fueled automobile exhaust contains harmful components such as hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx). It is necessary to use a catalyst to purify each harmful component, to oxidize the hydrocarbon (HC) into water and carbon dioxide, to oxidize the carbon monoxide (CO) to carbon dioxide, and to oxidize the nitrogen oxide (NOx) reduced to nitrogen. [0003] As such a catalyst for treating exhaust gas (hereinafter referred to as "exhaust gas purification catalyst"), a three-way catalyst (Three Way Catalysts: TWC) capable of oxidizing and reducing CO, HC, and NOx is used. [0004] As such a three-way catalyst, it is known that platinum (Pt), palladium (Pd), rhodium (Rh), etc. are supported on a refractory oxide porous body h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/94B01D53/62B01D53/56B01D53/72B01J35/00
CPCB01D53/945B01J23/894B01J23/8946B01J23/8953B01J23/8986B01J37/0248B01D2255/204B01D2255/2047B01D2255/2063B01D2255/2065B01D2255/2073B01D2255/20738B01D2255/20746B01D2255/20753B01D2255/20761B01D2255/9202B01J2523/00Y02T10/12B01J35/40B01J2235/00B01J2235/30B01J35/77B01J35/70B01J2235/15B01J2523/31B01J2523/3712B01J2523/824B01J2523/842B01J2523/845B01J2523/72B01J2523/847B01J2523/17B01J2523/22B01J2523/3706B01J2523/24B01J35/30
Inventor 中原祐之辅木下和也奥村博昭木俣文和津田丰史
Owner MITSUI MINING & SMELTING CO LTD