Thermal stabilities of hexagonal and orthorhombic YbFeO_3 synthesized by solvothermal method and their catalytic activities for methane combustion

摘要

Thermal stabilities of hexagonal and orthorhombic YbFeO_3 samples synthesized by the solvothermal method were investigated. The morphology and BET surface area of hexagonal YbFeO_3 did not change by calcination, while orthorhombic YbFeO_3 easily sintered, resulting in a decrease of the BET surface area. The hexagonal YbFeO_3 sample, which had a high surface area (29 m~2/g) after calcination at 800 ℃, had higher catalytic activity for methane combustion than the orthorhombic YbFeO_3 samples calcined at 800 ℃.