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Cerium-zirconium-based composite oxide and method for producing same
Provided is a cerium-zirconium-based composite oxide having an excellent OSC, high catalytic activity, and excellent heat resistance, and also provided is a method for producing the same. The cerium-zirconium-based composite oxide comprises cerium, zirconium, and a third element other than these elements. The third element is (a) a transition metal element or (b) at least one or more elements selected from the group consisting of rare earth elements and alkaline earth metal elements. After a heat treatment at 1,000° C. to 1,100° C. for 3 hours, (1) the composite oxide has a crystal structure containing a pyrochlore phase, (2) a value of {I111/(I111+I222)}×100 is 1 or more, and (3) the composite oxide has an oxygen storage capacity at 600° C. of 0.05 mmol/g or more, and an oxygen storage capacity at 750° C. of 0.3 mmol/g or more.
Cerium-zirconium-based composite oxide and method for producing same
Provided is a cerium-zirconium-based composite oxide having an excellent OSC, high catalytic activity, and excellent heat resistance, and also provided is a method for producing the same. The cerium-zirconium-based composite oxide comprises cerium, zirconium, and a third element other than these elements. The third element is (a) a transition metal element or (b) at least one or more elements selected from the group consisting of rare earth elements and alkaline earth metal elements. After a heat treatment at 1,000° C. to 1,100° C. for 3 hours, (1) the composite oxide has a crystal structure containing a pyrochlore phase, (2) a value of {I111/(I111+I222)}×100 is 1 or more, and (3) the composite oxide has an oxygen storage capacity at 600° C. of 0.05 mmol/g or more, and an oxygen storage capacity at 750° C. of 0.3 mmol/g or more.
Cerium-zirconium-based composite oxide and method for producing same
HAYASHIDA HIROYUKI (Autor:in) / TATSUMI AKIKO (Autor:in)
08.05.2018
Patent
Elektronische Ressource
Englisch
IPC:
B01J
Chemische oder physikalische Verfahren, z.B. Katalyse oder Kolloidchemie
,
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
/
C01G
Verbindungen der von den Unterklassen C01D oder C01F nicht umfassten Metalle
,
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
/
C04B
Kalk
,
LIME
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