10.1002/cssc.201601443
ChemSusChem
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assignable to the sequential reduction steps of MnO2 (i.e., MnO2
→
Mn2O3 Mn3O4 MnO). The reduction peak top temperature
→
→
(determined by DTA curve) of each sample decreased in the order of
MnO2 (317 ºC) > Mn2O3 (465 ºC) > Mn3O4 (490 ºC). In addition, the
reactivity of manganese oxides for oxidation of HMF decreased in the
order of MnO2
> Mn2O3 > Mn3O4. It has been reported that the
reducibilities of manganese oxides are in good agreement with the
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measurements. There was no significant difference in the XRD patterns
of fresh MnO2 and recovered one after the calcination (Figure S2). The
surface Mn valent state was also investigated by X-ray photoelectron
spectroscopy (XPS). The XPS spectrum of fresh MnO2 was in well
agreement with that of the recovered one after the calcination (Figure
S5). It has been reported that the reduction of MnO2 to Mn3O4 occurs
around 900ºC in air.[19] These results indicate no significant
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