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Catalyst support and catalyst for exhaust-gas purification

A technology for catalyst carrier and exhaust gas purification, which is applied in the direction of catalyst carrier, physical/chemical process catalyst, exhaust device, etc., and can solve the problems of particle size increase, easy mutual sintering, surface increase, etc.

Inactive Publication Date: 2012-07-04
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the particle diameter of the catalyst component is reduced, its surface energy increases, so it becomes easy to sinter with each other (sintering)
Especially in exhaust gas purification catalysts, the catalyst is exposed to high temperatures of hundreds of degrees due to the heat of the exhaust gas or the heat generated by the reaction, which tends to lead to sintering of noble metal particles, increase in particle size, and decrease in activity

Method used

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  • Catalyst support and catalyst for exhaust-gas purification
  • Catalyst support and catalyst for exhaust-gas purification
  • Catalyst support and catalyst for exhaust-gas purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] [Synthesis of Lanthanum Oxide-Silica Composite Oxide Catalyst Support of the Present Invention]

[0096] As described below, the composition of La was synthesized by microemulsion method 10 Si 6 o 27 Lanthanum oxide-silica composite oxide catalyst support.

[0097] First, as a source of lanthanum (La), 180 ml of a mixed aqueous solution of lanthanum nitrate (0.3016 mol, concentration 1.675 M) and ammonia (0.3748 mol, concentration 2.082 M) was mixed with 22.6 ml of 2-butanol until the alkyl A microemulsion was prepared by dissolving 456.9 g of surfactant BC-5.5 (trade name) in 6485 ml of cyclohexane. On the other hand, as a silicon (Si) source, an alkoxide solution in which 0.1809 mol of tetraethoxysilane (TEOS) was dissolved in 1000 ml of cyclohexane was prepared.

[0098] An alkoxide solution as a source of silicon (Si) was mixed with the microemulsion as a source of lanthanum (La), and 79.85 ml of ammonia water with a concentration of 14.8 M and 7.69 ml of distil...

Embodiment 2

[0135] In this example, the effect of the composition of the composite oxide on the effect of suppressing sintering will be described.

[0136] A plurality of lanthanum oxide-silica composite oxides with different lanthanum contents (La / (La+Si)) were prepared, each loaded with 1 wt% of platinum particles, and after calcination at 800°C in air for 2 hours, the platinum was measured. particle size. The evaluation results for the platinum (Pt) particle size are shown in Figure 4 middle. Depend on Figure 4 It was clearly confirmed that when the lanthanum content is around 50 to 70%, the particle size of the platinum particles can be kept small, and the effect of suppressing sintering is large.

[0137] Similarly, regarding the neodymium oxide-zirconia composite oxide, the influence of the neodymium content rate (Nd / (Nd+Zr)) was investigated. The supported amount of platinum particles and firing conditions are the same as those in the case of the above-mentioned lanthanum oxi...

Embodiment 3

[0140] Using zirconia sol, the lanthanum oxide-silicon dioxide composite oxide (La 10 Si 6 o 27 ) The catalyst carrier is coated on a monolith honeycomb (MonolithHoneycomb) substrate, and then 1.2g / substrate-L platinum is supported on the substrate coated with the catalyst carrier to obtain the exhaust gas purification catalyst of the present invention.

[0141] The thus obtained exhaust gas purification catalyst of the present invention was supplied with a stoichiometry gas having the following composition at 1000° C. for 2 hours, 10 hours and 20 hours, respectively, for durability. Then, for the exhaust gas purification catalyst of the present invention that has not been durable and the exhaust gas purification catalyst of the present invention that has been durable, the same stoichiometric gas is supplied while the temperature is raised, and the HC 50% purification temperature is investigated (the purification rate of HC reaches 50% % catalyst temperature).

[0142] Tabl...

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Abstract

The invention provides a catalyst support which produces the excellent effect of inhibiting noble-metal catalyst particles from sintering and a catalyst for exhaust-gas purification. The catalyst support, which is for noble-metal supporting, comprises a composite oxide of: an electron-accepting element (La) which has the property of accepting an electron from a noble metal element (Pt) upon approach of or contact with the noble metal element and which does not change in valence through oxidation / reduction reactions; and other element(s) (Si). The invention also provides an exhaust-gas purification catalyst on this catalyst support for carrying noble-metal catalyst particles.

Description

technical field [0001] The present invention relates to a catalyst carrier for supporting noble metal catalyst particles, and an exhaust gas purification catalyst in which noble metal catalyst particles are supported on the catalyst carrier. Background technique [0002] In the case of a catalyst in which noble metal particles are supported on a carrier as a catalyst component, the noble metal particles are supported on the carrier in the form of fine particles in order to improve the activity. This is to maximize the specific surface area of ​​the catalyst component. However, if the particle size of the catalyst component is reduced, the surface energy thereof increases, so that mutual sintering (sintering) becomes easy. Especially in exhaust gas purification catalysts, the catalyst is exposed to high temperatures of hundreds of degrees due to the heat of the exhaust gas or heat generated by the reaction, which tends to cause noble metal particles to sinter, increase their...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01D53/86B01D53/94B01J23/42B01J32/00F01N3/10F01N3/28
Inventor 竹岛伸一小山晃生
Owner TOYOTA JIDOSHA KK
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