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Molybdenum based oxide catalysts Mo-H,Mo-Fe,Mo-Ce,and Mo-Sn were prepared by calcining H3PMo12O40,Fe1.5 PMo 12O40,Ce1.5PMo12O40,and Sn1.5 PMo12O40 heteropolyanion precursors at700℃,respectively.The prepared oxides have been characterized and tested for th