Abstract
Au/Co 3 O 4 catalysts with different morphologies (nanorods, nanopolyhedra and nanocubes) were successfully synthesized and evaluated for ethylene complete oxidation. We found that support morphology has a significant effect on catalytic activity, which is related to the exposed planes of different morphological Co 3 O 4 . HRTEM revealed the Co 3 O 4 -nanorods predominantly exposes {110} planes, while the dominant exposed planes of Co 3 O 4 -nanopolyhedra and -nanocubes are {011} and {001} planes, respectively. Compared with {011} and {001} planes, {110} planes exhibit the maximum amount of oxygen vacancies, which play a major role in ethylene oxidation. Therefore, Au/Co 3 O 4 -nanorods exhibits extraordinary catalytic activity, yielding 93.7% ethylene conversion at 0 °C. ► Nanoscale Co 3 O 4 with various morphologies and gold supported catalysts were prepared. ► The morphology/crystal plane had a significant influence on catalytic performance. ► Gold dispersed on Co 3 O 4 nanorods yielded the highest ethylene conversion (93.7%). ► The {110} planes with the maximum amount of oxygen vacancies could be more active.
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