Boosting Catalytic Combustion of Ethanol by Tuning Morphologies and Exposed Crystal Facets of α-Mn2O3

Three types of α-Mn2O3 catalysts with different well-defined morphologies (cubic, truncated octahedra and octahedra) exposed crystal facets have been successfully prepared via hydrothermal processes, evaluated for ethanol total oxidation low concentration at temperatures. The α-Mn2O3-cubic catalyst shows a superior catalytic reaction rate than that α-Mn2O3-truncated α-Mn2O3-octahedra under high space velocity 192,000 mL/(g·h). Based on the characterization results obtained from XRD, BET, FE-SEM, HR-TEM, FT-IR, H2-TPR, XPS, ethanol-TPD, CO-TPSR techniques, observed morphology-dependent reactivity can be correlated to good low-temperature reducibility, abundant surface Mn4+ adsorbed reactive oxygen species, which was originated (001) planes. Through tuning morphology facet α-Mn2O3, highly active selectivity excellent stability is obtained. developed approach may applied broadly development design principles high-performance low-cost environmentally friendly Mn-based catalysts.