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Catalyst composition for exhaust gas purification and exhaust gas purifying catalyst for automobiles

A technology of exhaust gas purification and catalyst, which is applied in the direction of catalyst activation/preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc. It can solve the problems of NOx performance reduction and damage to Pd performance, and achieve high purification performance and stable supply , the effect of effective use

Inactive Publication Date: 2015-02-18
N E CHEMCAT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the exhaust gas, the control value for NOx becomes severe especially, but in the conventional TWC, as mentioned above, Rh moves from the surface layer with high gas contact to the lower layer, so not only the reduction of NOx performance is caused, but also the There is damage to the performance of Pd due to alloying with the underlying Pd

Method used

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  • Catalyst composition for exhaust gas purification and exhaust gas purifying catalyst for automobiles
  • Catalyst composition for exhaust gas purification and exhaust gas purifying catalyst for automobiles
  • Catalyst composition for exhaust gas purification and exhaust gas purifying catalyst for automobiles

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Experimental program
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preparation example Construction

[0125] (1) Preparation method of catalyst composition

[0126] In order to prepare the exhaust gas-purifying catalyst composition of the present invention, when α-alumina is supported on a zirconia-based base material, the following method can be used, for example.

[0127] (Process 1)

[0128] Mix the slurry containing α-alumina particles and the slurry containing zirconia-based base material, and cover and load α-alumina on the oxidized on the zirconium base material. As the slurry, in addition to the above, slurry obtained by wet pulverizing α-alumina until it becomes fine particles using a pulverizing device such as a bead mill, or using a pulverizing device such as a bead mill A slurry obtained by wet pulverizing materials until they reach a specified particle size.

[0129] (Craft 2)

[0130] In process 1, boehmite, γ-alumina, etc. are used instead of α-alumina, which are covered on the zirconia-based base material, and then the alumina-supported zirconia-based base ...

Embodiment 1

[0168] Set the BET specific surface area to 7m 2 300 g of α-alumina powder A per g and water were put into a ball mill, and α-alumina was ground until the average particle diameter (D50) became 200 nm, thereby obtaining slurry α.

[0169] Operate in the same way, by making the BET specific surface area 60m 2 / g, neodymium oxide zirconium oxide powder B (Nd 2 o 3 :La 2 o 3 :ZrO 2 =17.5:7.5:75) 690 g and water were put into a ball mill and milled until the average particle diameter (D50) of neodymium oxide and zirconium oxide became 3 μm, thereby obtaining slurry β.

[0170] Slurry α and slurry β were added in a ratio of 30:69 according to the solid content ratio and stirred and mixed, then the mixed slurry was sprayed and dried by a spray dryer, and the obtained powder was calcined at 600°C for 2 hours, Thus, 30.3% by weight α-alumina-supported neodymium-zirconia powder a {average particle diameter (D50): 10 μm} was obtained.

[0171] An aqueous solution of Rh nitrate wa...

Embodiment 2

[0185] =Lower=

[0186] The aqueous solution of Pd nitrate is impregnated and supported on BET with a specific surface area of ​​150m 2 / g and 993.8 g of γ-alumina powder C with a pore diameter of 23 nm, thereby obtaining 0.62% by weight Pd-supported alumina powder c.

[0187] In the same manner, the Pd nitrate solution was impregnated and supported on the BET specific surface area of ​​73m so that the precious metal conversion would be 3.5g. 2 / g, cerium oxide zirconium oxide powder D(CeO 2 :La 2 o 3 :ZrO 2 =45:10:45) 996.5 g, thereby obtaining 0.35% by weight Pd-supported ceria / zirconia powder d.

[0188] Furthermore, 0.62 wt% Pd supported alumina powder c 500g, 0.35 wt% Pd supported ceria·zirconia powder 400g, BET specific surface area 5m 2 150 g of barium sulfate / g and 210 g of γ-alumina powder C were dispersed in water, mixed with a stirrer or the like to obtain slurry γ.

[0189] Next, the flow-through cordierite carrier {600Cell / inch 2 (930k / m 2 ) / 4mil (0.1mm),...

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Abstract

Provided are: a catalyst composition for exhaust gas purification, which exhibits excellent performance in removing nitrogen oxides (NOx), carbon monoxide (CO) and carbon hydride (HC) in an exhaust gas that is discharged from an internal combustion engine such as a gasoline-powered vehicle; and an exhaust gas purifying catalyst for automobiles. A catalyst composition for exhaust gas purification for removing nitrogen oxides, carbon monoxide and carbon hydride in an exhaust gas, which contains a catalyst composition wherein rhodium is supported, together with alpha-alumina particles, by a zirconia base. This catalyst composition for exhaust gas purification is characterized in that the alpha-alumina particles have an average particle diameter of from 10 nm to 1 mum, said average particle diameter being smaller than the average particle diameter of the zirconia (ZrO2) base.

Description

technical field [0001] The present invention relates to a catalyst composition for purifying exhaust gas and a catalyst for purifying exhaust gas for automobiles, and more particularly to the purifying performance of nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons (HC) in exhaust gases emitted from gasoline vehicles It is excellent and suitably used as a catalyst composition for exhaust gas purification of a three-way catalyst (TWC: Three Way Catalyst) and a catalyst for exhaust gas purification for automobiles. Background technique [0002] Various catalysts are used in catalytic devices for purifying exhaust gas emitted from internal combustion engines such as automobiles, depending on the purpose. Platinum group metals are present in the main catalyst components, and are usually highly dispersed and supported on high-surface-area refractory inorganic oxides such as activated alumina (see Patent Document 1). [0003] Platinum (Pt), palladium (Pd), and rhodiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01J23/58B01J35/10B01J37/02F01N3/10
CPCB01J23/63B01D2258/014B01D2255/2092B01D2255/1021B01J35/023B01D53/945B01D2255/1025Y02T10/22B01D2255/9022B01J37/0244B01D2255/1023B01J23/464B01D2255/407B01D2255/9202B01D2255/9207B01J2523/00Y02A50/20Y02T10/12B01J35/40B01J2523/3706B01J2523/3725B01J2523/48
Inventor 长岛健
Owner N E CHEMCAT
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