COMPOSITION BASED ON OXIDE OF ZIRCONIUM, CERIUM AND LANTHANUM AND YTTRIUM, GADOLINIUM OR SAMARIUM HAVING HIGH SPECIFIC SURFACE AREA AND RATE OF REDUCTION, AND PREPARATION METHOD THEREFOR AND USE AS CATALYST

摘要

PROBLEM TO BE SOLVED: To provide a material having a specific surface area whose surface area stability is increased.SOLUTION: The material includes each rare-earth oxide selected from among zirconium, cerium and lanthanum and yttrium, gadolinium and samarium, each oxide having a specific surface area of at least 40 m/g and at least 15 m/g after calcination for 4 hours at 1,000°C and 10 hours at 1,150°C. Moreover, after the calcination of 10 hours at 1,200°C, the surface area of at least 7 m/g is possessed.