Optimal exposed crystal facets of ?-Mn2O3 catalysts with enhancing catalytic performance for soot combustion
نویسندگان
چکیده
The exposed crystal facets of the catalysts are crucial to catalytic performances for soot combustion as a typical heterogeneous catalysis reaction. Herein, we have successfully synthesized well-defined ?-Mn2O3 nanocrystals with three morphologies octahedrons (?-Mn2O3-O), truncated octahedral bipyramids (?-Mn2O3-TOB) and hexagonal nanosheets (?-Mn2O3-HN) via adjusting amount glucose in hydrothermal method, their predominantly {111}, {211} {001}, respectively. activities were tuned by facet arranged order: ?-Mn2O3-HN > ?-Mn2O3-TOB ?-Mn2O3-O, catalyst shows highest activity during combustion, its T10, T50 T90 values 282, 373 424 °C, possess good stability four cycles soot-TPO. facet-dependent is systematically investigated means various characterizations. {001} can improve surface density active oxygen species enhance low-temperature reducibility Mn4+ species. research highlights new strategy fabrication efficient ?-Mn2O3-based removal diesel particles or other pollution.
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ژورنال
عنوان ژورنال: Catalysis Today
سال: 2021
ISSN: ['0920-5861', '1873-4308']
DOI: https://doi.org/10.1016/j.cattod.2020.05.039