Biphasic intergrowth effects of La2MnNiO6–MgO composite oxide for methane catalytic combustion

Authors: Ranran Ding, Chun Li, Lingjie Wang, Ruisheng Hu

Abstract:
Biphasic intergrowth La₂MnNiO₆–MgO composite oxide containing 30 wt% La₂MnNiO₆ was synthesized by ammonia aqueous (25 vol.%) co-precipitation method calcined at 1100^◦C and investigated in the catalytic combustion of methane. Compared with the corresponding pure double perovskite-type oxide La₂MnNiO₆, the composite oxide La2MnNiO6–MgO exhibited much higher catalytic performance (T50 = 548 ^◦C,T90 = 628 ◦C) and exceptional thermal stability. The excellent performance of La₂MnNiO₆–MgO was explained by various characterizations, such as XRD, ICP, H2-TPR, XPS, and TEM techniques. The catalytic activity of La₂MnNiO₆–MgO prepared by biphasic intergrowth method is superior to La₂MnNiO₆/MgO obtained by impregnation technique, mechanical mixing of La₂MnNiO₆ and MgO, and pure La₂MnNiO₆. The better performance of La₂MnNiO₆–MgO formethane catalytic combustionreaction is ascribed to a strong intergrowth interaction between La₂MnNiO₆ and MgO during the synthesis process. Therefore, the La₂MnNiO₆–MgO composite oxide can be deemed as an attractive candidate as a catalyst for the combustion of methane.

Keywords:
Biphasic intergrowth
Double perovskite-type oxide
Methane catalytic combustion

Published in: Applied catalysis A: General  (Volumes 464–465, Pages 1-384, 15 August 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Biphasic intergrowth effects of La2MnNiO6–MgO composite oxide for methane catalytic combustion

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