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Oxygen storage material and its manufacturing method

An oxygen storage material and technology for manufacturing methods, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., to achieve excellent oxygen evolution rate, inhibition of thermal decomposition, heat resistance excellent effect

Active Publication Date: 2022-03-25
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in recent years, the characteristics required for exhaust gas purification catalysts have been increasing, and according to the knowledge of the present inventors, it is increasingly required to have an oxygen storage capacity (OSC) at a relatively low temperature of about 400° C. Oxygen storage materials that are stable at high temperature conditions such as about 600°C to about 1,000°C and are also excellent in heat resistance. The existing oxygen storage materials described in the above-mentioned Patent Document 1 are not necessarily sufficient.

Method used

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  • Oxygen storage material and its manufacturing method
  • Oxygen storage material and its manufacturing method
  • Oxygen storage material and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Set the target composition to LaCo 0.8 Al 0.2 O 3 (Composition: LaCo 1-x Al x O 3 where x=0.2), the La-Co-Al composite oxide having the above-mentioned composition was obtained by the complex polymerization method as described below.

[0081] That is, first, lanthanum nitrate, cobalt nitrate, and aluminum nitrate in stoichiometric ratios were dissolved in the minimum amount of pure water shown in Table 1 at the input amounts shown in Table 1 at room temperature, In order to make it the above target composition, after confirming that the solution became transparent, citric acid in the amount shown in Table 1 and ethylene glycol in the amount shown in Table 1 were added to the total amount of cations. Dissolve and mix to obtain a solution containing the metal citric acid complex. Next, the solution containing the above-mentioned metal citric acid complex was heated to 150° C. and maintained for 30 minutes to obtain a polymer gel in which the above-mentioned metal ci...

Embodiment 2～4

[0083] In addition to setting the target composition as

Embodiment 2

[0084] Example 2: LaCo 0.6 Al 0.4 O 3 (Composition: LaCo 1-x Al x O 3 in x=0.4)

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Abstract

The present invention relates to oxygen storage materials and methods for their manufacture. The oxygen storage material is an oxygen storage material comprising a La-Co-Al-based composite oxide containing lanthanum, cobalt, and aluminum, wherein the La-Co-Al-based composite oxide is at least a part of the aluminum solid-dissolved in A form in a La-Co composite oxide having a perovskite structure, and has a composition represented by the following chemical formula (1): LaCo y Al x o δ (1) In the chemical formula (1), each of x and y is a number satisfying the conditions of 0<x<1, 0<y<1, and x+y=0.5 to 1.5, and δ is a number of 1.5 to 4.5.

Description

technical field [0001] The present invention relates to an oxygen storage material and a manufacturing method thereof. Background technique [0002] As an exhaust gas purification catalyst capable of reducing nitrogen oxides (NOx) while oxidizing carbon monoxide (CO) and hydrocarbons (HC) in exhaust gas discharged from an internal combustion engine such as an automobile engine, a so-called three-way catalyst is known. [0003] Furthermore, in order to absorb fluctuations in the oxygen concentration in the exhaust gas and improve the exhaust gas purification ability when purifying exhaust gas using an exhaust gas purification catalyst, it is known to use a catalyst having a high oxygen concentration in the exhaust gas that can store oxygen and a low oxygen concentration in the exhaust gas. The material with the oxygen storage capacity (Oxygen Storage Capacity (OSC)) that can release oxygen at the same time is used as the carrier and co-catalyst of the exhaust gas purification...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J32/00B01J37/08
CPCB01J23/83B01J23/002B01J37/086B01J2523/00B01J35/70B01J2235/15B01J35/77B01J35/40B01J2523/31B01J2523/3706B01J2523/845B01J37/036B01D2255/908B01D2258/01F01N3/0864F01N2900/1624Y02T10/12B01J37/04F01N3/101F01N2570/16F01N2370/02
Inventor 后藤能宏森川彰三浦真秀高木信之
Owner TOYOTA JIDOSHA KK
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