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Exhaust gas purifying catalyst and process for producing it

A technology for exhaust gas purification and catalyst, which can be used in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as inability to meet heat resistance

Inactive Publication Date: 2008-07-30
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, ceria has preferable properties for use in exhaust gas purification catalysts, but sometimes cannot satisfy the heat resistance required in such use

Method used

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  • Exhaust gas purifying catalyst and process for producing it
  • Exhaust gas purifying catalyst and process for producing it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The ceria-zirconia solid solution powder (Ce: Zr (molar ratio) = 1: 1, specific surface area: 70m 2 / g) was dispersed in 6 times the amount (by mass) of distilled water, and the dinitrodiammine platinum solution was added in an amount to obtain a platinum concentration of 1.0% by mass based on the carrier. The resulting solution was mixed for 1 hour, dried at 120° C. to remove water contained in the solution, and the residue was calcined at 500° C. for 2 hours and pulverized in a mortar to obtain a platinum-supporting carrier powder.

[0067] The platinum-supporting carrier powder thus obtained was dispersed in 6 times the amount (by mass) of an aqueous solution of iron(III) nitrate nonahydrate, and the resulting solution was mixed for 1 hour. The iron salt solution contains the amount of iron ions so that the catalyst finally obtained can contain 10% by mass of iron oxide (Fe 2 o 3 ). Then, the water contained in the solution was removed at 120°C, and the residue wa...

Embodiment 2～7

[0069]In addition to replacing iron (III) nitrate nonahydrate with gallium (III) nitrate, silver nitrate, diammonium molybdate, ammonium tungstate pentahydrate, thallium nitrate and bismuth (III) nitrate pentahydrate, respectively, to implement Example 1 obtains the exhaust gas purification catalyst of embodiment 2~7 in the same manner, so that the catalyst finally obtained can comprise gallium oxide (Ga 2 o 3 ), silver oxide (AgO), molybdenum oxide (MoO 2 ), tungsten oxide (WO 2 ), thallium oxide (Tl 2 o 3 ) or bismuth oxide (Bi 2 o 3 ).

Embodiment 8

[0104] Zirconia powder (amount of added ceria: 2% by mass, specific surface area: 98m2) added with ceria as catalyst carrier 2 / g) was dispersed in 6 times the amount (by mass) of distilled water, and a rhodium nitrate solution (2.7 mass%) was added in an amount to obtain a rhodium concentration of 0.5 mass% based on the support. The resulting solution was mixed for 1 hour, and after removing water contained in the solution at 120° C., the residue was calcined at 500° C. for 2 hours, and then pulverized in a mortar to obtain a rhodium-supporting carrier powder.

[0105] The thus-obtained rhodium-loaded carrier powder was dispersed in 6 times the amount (by mass) of an aqueous solution of iron(III) nitrate nonahydrate, and the resulting solution was mixed for 1 hour. The iron salt solution contains iron ions in such an amount that the final catalyst can have an iron (Fe) rhodium (Rh) ratio (Fe / Rh) of 2.0. Then, the water contained in the solution was removed at 120°C, and the ...

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Abstract

The present invention is an exhaust gas purifying catalyst comprising a metal oxide support (CeO2) mainly constituted of an oxide of one or more first metals or semimetals, and a noble metal (Pt) and an oxide of a second metal or semimetal (MOx) directly supported thereon; as well as a process for producing it. The second metal or semimetal has an electronegativity larger than that of the first metals or semimetals, and is selected from the group consisting of metals and semimetals excluding platinum-group metals and gold.

Description

technical field [0001] The invention relates to an exhaust gas purification catalyst and a preparation method thereof. Background technique [0002] Exhaust gases from internal combustion engines such as automobile engines contain nitrogen oxides (NO x ), carbon monoxide (CO), hydrocarbons (HC), etc. can usually be achieved by being able to oxidize CO and HC and simultaneously reduce NO x exhaust gas purification catalyst to purify these substances. As a typical exhaust gas purification catalyst, there is known a three-way catalyst in which noble metals such as platinum (Pt), rhodium (Rh) and palladium (Pd) are supported on a porous metal oxide support such as γ-alumina. [0003] Metal oxide supports can be formed from different materials, but in order to obtain a large surface area, aluminum oxide (Al 2 o 3 ). However, in recent years, various other materials such as ceria (CeO 2 ), zirconia (ZrO 2 ), titanium (TiO 2 ) and silicon dioxide (SiO 2 ) in combination w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01J23/63B01J23/62B01J23/652
CPCB01J23/63B01J23/6525B01J23/66B01D53/945B01D2255/407B01J23/6527B01J23/894Y02T10/22Y02T10/12B01D53/94B01J23/62B01J23/652
Inventor 三浦真秀
Owner TOYOTA JIDOSHA KK
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