Appendix A. Supplementary data
The following is Supplementary data to this article:
Catalyst preparation; Catalyst characterization; XRD patterns of the as-prepared γ-MnOOH; N2 adsorption and desorption isotherms of the different MnOx catalysts; Top plane view and the oxygen vacancy sites of the preferentially exposed crystal plane for various MnOx during DFT calculation; FT-IR spectra of MnO2-H-200 and partially deactivate MnO2-H-200 catalysts.