Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 278, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119279
Keywords
Toluene oxidation; Mn2O3; Heterostructure interface; EELS; In-situ DRIFTS
Funding
- National Key Research and Development Program [2018YFC0214101, 2018YFC0214106]
- National Natural Science Foundation of China [21777081, 21936005]
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Mn-based heterostructure catalysts show great potential for catalytic oxidation of toluene owing to the unique properties of their hetero-interfaces. Herein, we tailored the MnO2 heteroepitaxy over Mn2O3 to achieve welldefined morphology and constructed clean MnO2-Mn2O3 heterostructure interfaces by H+/KMnO4 treatment. The T-0.5 catalyst (treating duration of 0.5 h) gave the highest activity and good stability. The interface enhanced the reducibility and oxygen storage capacity compared with pure Mn2O3. Surface reconstruction and metastable facets exposure were observed after the H+/KMnO4 treatment, leading to the easy-release of lattice oxygen. Additionally, abundant oxygen vacancies and redundant coordination lattice oxygen were observed at the MnO2 and Mn2O3 sides of the hetero-interface, respectively. These features provided ample oxygen adspecies and increased lattice oxygen mobility. The interface-related oxygen vacancies facilitated methyl dehydrogenation and demethylation of adsorbed toluene. The redundant coordination lattice oxygen contributed to the enhanced aromatic ring breakage capability.
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