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    Activating dinitrogen for chemical looping ammonia synthesis: nitridation of manganese

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    Issue Date
    2021-04-23
    Author
    Aframehr, Wrya Mohammadi
    Pfromm, Peter H.
    Publisher
    Journal of Materials Science
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Published Version
    https://link.springer.com/article/10.1007/s10853-021-06079-7
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    Abstract
    The earth-abundant transition metal manganese (Mn) has been shown to be useful to activate dinitrogen at atmospheric pressure and elevated temperature by forming bulk Mn nitrides. Mn nitrides could then be used, for example, for ammonia (NH3) synthesis in a chemical looping process by contacting nitride with gaseous hydrogen (H2). Here, we present an investigation of the morphology and local time-dependent composition of micrometer-scale Mn plates during nitridation in dinitrogen (N2) near atmospheric pressure at 700 °C. The main motivation was to obtain design data for chemical looping synthesis of NH3 and to add to the somewhat sparse literature on nitridation of Mn. The morphology and elemental compositional variation of the nitrided specimens were studied with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), wide angle X-ray diffraction (WAXD), and mass balances. Three possible nitrogen (N) populations that may govern the Mn nitridation and later NH3 synthesis are identified. After four hours of nitridation, the N weight gain was found to be 9.4 ± 0.7 kgN to nMn−1 for the plates used here, resulting in a nitridation depth of 83 ± 8 μm.
    URI
    http://hdl.handle.net/1808/33690
    DOI
    https://doi.org/10.1007/s10853-021-06079-7
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    • FEWtures Project [18]
    Citation
    Wrya Mohammadi Aframehr and Peter H. Pfromm. 2021. Activating dinitrogen for chemical looping ammonia synthesis: nitridation of manganese. Journal of Materials Science 56: 12584-12595.

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    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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