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A Novel Hexaaluminate Material: Preparation, Characterization and Catalytic Activity in Methane Combustion

A novel hexaaluminate material Ca0.6La0.4FexMn1-xAl11O19 was prepared by a micro-emulsion method, and then washcoated on the cordierite substrates to produce monolithic catalysts. The obtained hexaaluminates were characterized by X-ray diffraction and scanning electron microscope. Results show that the particles of the prepared hexaaluminates samples are well-proportioned and small, and that the lower-quantity replacement of Mn2+ with Fe3+ is of benefit to forming single hexaaluminates crystal phases. After the partial replacement of Mn2+ with Fe3+ in hexaaluminate, the catalytic activity in methane combustion improved.