Abstract
Ln 2B 2O 7 (Ln=Sm, Eu, Gd and Tb; B=Zr or Ti) with pyrochlore structure was prepared by sol–gel method for the high-temperature catalytic combustion. The crystal structure of Ln 2B 2O 7 was identified by XRD and their surface area was about 4 m 2/g after calcinations at 1200 °C. Catalytic activity of methane combustion was observed for Ln 2Zr 2O 7 series and the best catalyst was Sm 2Zr 2O 7. Its relative reaction rate per unit surface area at 600 °C was 2 cm 3/m 2 min, which was twice higher than that of Mn-substituted Sr hexaaluminate. From surface analysis by XPS, the low binding energy of each Ln element of Ln 2Zr 2O 7 compared to that of Ln 2Ti 2O 7, gave the catalytic activity of methane combustion.
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