Rod-like, hexagonal and fiber-like SBA-15 mesoporous silicas were synthesized to support MnO for toluene oxidation. This study showed that the morphology of the supports greatly influenced the catalytic activity in toluene oxidation. MnO supported on rod-like SBA-15 (R-SBA-15) displayed the best catalytic activity and the conversion at 230°C reached more than 90%, which was higher than the other two catalysts. MnO species consisted of coexisting MnO and MnO on the three kinds of SBA-15 samples. Large amounts of MnO species were formed on the surface and high oxygen mobility was obtained on MnO supported on R-SBA-15, according to the H temperature programmed reduction (H-TPR) and X-ray photoelectron spectroscopy (XPS) results. The Mn/R-SBA-15 catalyst with greater amounts of MnO species possessed a large amount of surface lattice oxygen, which accelerated the catalytic reaction rate. Therefore, the surface lattice oxygen and high oxygen mobility were critical factors on the catalytic activity of the Mn/R-SBA-15 catalyst.
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