Regulation of the existing state of Cu species in high water-toletant CuOx-Mn3O4 for VOCs mixtrue catalytic oxidation

The existing state of Cu species play a crucial role in the activity of CuOx-Mn3O4 catalysts. In this work, CuOx- Mn3O4 with CuO loading on and Cu partially substituted Mn in spinel were successfully synthesized by adjusting the doping strategy of Cu. The CuOx-Mn3O4-IPM with substituted Cu, which derived from Cu-doped Mn-MOF-74, exhibited the largest specific surface area, the highest Mn3+ and oxygen vacancies, together with enhanced low temperature reduction performance. And thus it showed excellent catalytic activity for the mixture of toluene and acetone. The addition of a minute quantity of substituted Cu (2.60 %) significantly improved the catalytic activity of MnOx (T90%[Tol] and T90%[Ace] was increased by 23 degrees C and 37 degrees C, respectively). The results of the in situ DRIFTS showed that the reaction pathway of the mixture still follows that of single toluene and single acetone over CuOx-Mn3O4-IPM.