Tailoring porous structure, reducibility and Mn4+ fraction of ε-MnO2 microcubes for the complete oxidation of toluene

Minh Tuan Nguyen Dinh, Chinh Chien Nguyen, Tan Linh Truong Vu, Van Thinh Ho, Quang Duc Truong

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    3D architectures porous epsilon-type manganese dioxide (ε-MnO2) microcubes (PEMD) are successfully prepared by a glucose-urea-assisted hydrothermal synthesis of MnCO3-carbon composites followed by annealing. It turns out that urea essentially assists in building the cubic shape while glucose plays a crucial role to form carbon inside the microcrystals, which are latterly removed by annealing to generate the porous structure. As a result, ε-MnO2 materials possessing extraordinary features including the high porosity, reducibility, lattice oxygen reactivity and Mn4+ fraction, are feasible tailored. These unique properties, all together, significantly improve the catalytic performances of complete oxidation of toluene. Thus, it is found that the optimal catalyst (manganese-glucose-urea ratio of 6-2-6) synthesized at 180 °C exhibits an excellent activity for the complete oxidation of toluene (T90 = 243 °C, lower 10 °C than that of pristine ε-MnO2) and stability up to 10 h.

    Original languageEnglish
    Article number117473
    JournalApplied Catalysis A: General
    Volume595
    DOIs
    Publication statusPublished - 2020 Apr 5

    Keywords

    • Catalytic complete oxidation
    • Microcubes
    • MnCO
    • Porous structure
    • Toluene
    • ε-MnO

    ASJC Scopus subject areas

    • Catalysis
    • Process Chemistry and Technology

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