Manganese oxide octahedral molecular sieves (OMS-2) catalysts for the catalytic oxidation of toluene
were prepared by a solid-state reaction and a refluxing method. The effect of the synthesis method on
the catalytic activity was investigated. XRD patterns revealed that both OMS-2 materials had the typical
cryptomelane-type structure. OMS-2 by the refluxing method exhibited the higher catalytic activity than
that by the solid-state reaction method, on which the complete oxidation of toluene was achieved at
240 ◦C. According to the results of temperature programmed desorption (TPD) and thermogravimetric
analysis (TGA), it was apparent that more available lattice oxygen and higher oxygen mobility were
attributed to the catalytic activity of OMS-2 from the refluxing method. Furthermore, OMS-2 pretreated
at 250 ◦C exhibited the best catalytic performance and good stability for toluene oxidation without the
coke formation during 30 h