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Perovskite complex oxide and catalyst

A composite oxide and perovskite-type technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the cost of exhaust flow path components Increase and restrict the design freedom of motor vehicles, etc., to achieve the effects of high practical value, reduced temperature reduction, and improved purification efficiency

Inactive Publication Date: 2006-01-25
DOWA ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such countermeasures limit the degree of freedom in the design of automobiles and increase the cost of exhaust flow path components. Therefore, it is strongly desired to establish a technology for improving the purification efficiency of the catalyst itself in the low-temperature region.

Method used

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  • Perovskite complex oxide and catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Mix lanthanum nitrate, strontium nitrate and iron nitrate so that the molar ratio of lanthanum element, strontium element and iron element is 08:0.2:1. This mixture was added to water to obtain a raw material solution such that the total molar concentration of the lanthanum element, strontium element, and iron element in the liquid was 0.2 mol / L. The temperature of the solution was adjusted to 25°C while stirring the solution, and when the temperature reached 25°C, the pH was adjusted to 8 while adding an ammonium carbonate solution as a precipitating agent. Then, by continuing to stir for 12 hours while maintaining the reaction temperature at 25° C., formation of a precipitate proceeded sufficiently. After filtering and recovering the obtained precipitate, it was washed with water and dried at 110° C., and the obtained powder was called a precursor powder.

[0044] Perform X-ray powder diffraction of this precursor powder, as figure 1 As shown in , a broad diffractio...

Embodiment 2

[0050] The operation of Example 1 was repeated except that lanthanum nitrate and iron nitrate were mixed so that the molar ratio of lanthanum element and iron element became 1:1.

[0051] X-ray powder diffraction of the obtained sintered body was confirmed to be LaFeO 3 A single-phase perovskite-type composite oxide.

[0052] In addition, thermogravimetric measurement of this perovskite-type composite oxide was performed, and as a result, the weight loss ratio was 32.5%.

Embodiment 3

[0054] The operation of Example 1 was repeated except mixing lanthanum nitrate, strontium nitrate and manganese nitrate so that the molar ratio of lanthanum, strontium and manganese was 0.8:0.2:1.

[0055] X-ray powder diffraction of the obtained sintered body was carried out, and it was confirmed that (La 0.8 Sr 0.2 )MnO 3 A single-phase perovskite-type composite oxide.

[0056] In addition, thermogravimetry of this perovskite-type composite oxide was performed, and as a result, the weight reduction ratio was 33.8%.

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Abstract

A perovskite complex oxide is provided whose ratio of thermogravimetric weight decrease between 50 DEG C. and 180 DEG C. to thermogravimetric weight decrease between 50 DEG C. and 1000 DEG C. is not less than 30% and which contains, for example, one or more rare earth element species and one or more transition metal elements. Among perovskite complex oxides represented by structural formula RTO3, ones in which R is constituted by one or more rare earth element species and T is constituted by one or more transition metal elements, and ones in which R is constituted by one or more rare earth element species and one or more members selected from the group comprising alkali metal elements and alkali earth metal elements and T is constituted by one or more transition metal elements are excellent for use. A ''rare earth element species'' is defined as a member of the group of elements obtained by adding Y to the rare earth elements.

Description

technical field [0001] The present invention relates to a perovskite-type composite oxide having ideal high activity as a carrier of a motor vehicle exhaust purification catalyst and an exhaust purification catalyst using the same. Background technique [0002] In the second half of 1960, motor vehicle exhaust, which is one of the sources of air pollutants, was raised as a problem, and its purification technology was developed. Among them, motor vehicle exhaust purification catalysts have been put into practical use since 1975, and are now used by almost all motor vehicles in the United States and Japan. The adoption in the European Union and other countries is also proceeding rapidly, and they are constantly used as environmental purification catalysts. [0003] As a motor vehicle exhaust purification catalyst, its mainstream is a three-way catalyst that simultaneously oxidizes or reduces hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx), which are air poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/00B01D53/94
CPCC01G45/1264B01D53/944B01D2255/402B01J23/002B01J23/63B01J23/6562B01J23/8946B01J2523/00C01G1/00C01G49/0054C01P2002/34C01P2002/54C01P2002/72C01P2002/88B01J2523/24B01J2523/3706B01J2523/842B01J2523/72
Inventor 须田久
Owner DOWA ELECTRONICS MATERIALS CO LTD
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