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  Tracking the Active Catalyst for Iron-Based Ammonia Decomposition by In Situ Synchrotron Diffraction Studies

Tseng, J.-C., Gu, D., Pistidda, C., Horstmann, C., Dornheim, M., Ternieden, J., et al. (2018). Tracking the Active Catalyst for Iron-Based Ammonia Decomposition by In Situ Synchrotron Diffraction Studies. ChemCatChem, 10(19), 4465-4472. doi:10.1002/cctc.201800398.

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 Creators:
Tseng, Jo-Chi1, Author              
Gu, Dong2, Author              
Pistidda, Claudio3, Author
Horstmann, Christian3, Author
Dornheim, Martin3, Author
Ternieden, Jan1, Author              
Weidenthaler, Claudia1, Author              
Affiliations:
1Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3Zentrum für Material- und Küstenforschung GmbH, Helmholtz-Zentrum Geesthacht, Geesthacht, ou_persistent22              

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Free keywords: ammonia decomposition; iron nitrides; hydrogen carrier; in situ diffraction
 Abstract: Iron-based catalysts for NH3 decomposition have been studied by a combination of catalytic tests and in situ synchrotron diffraction experiments performed in an inert sapphire plug-flow cell. In contrast to steel-based reaction cells, sapphire or quartz glass cells show no blind activity. Starting from iron oxide precursors, iron nitrides form during the activation cycle. Nitrides remain as main crystalline phases and govern the conversion of NH3 decomposition in the subsequent cycles. In this work structural and compositional changes of the nitrides were monitored in situ during heating and cooling cycles. The state of the catalyst under reaction conditions was analyzed by high resolution in situ synchrotron diffraction experiments. The analyses enable establishing reaction pathways and correlation of structural features with catalytic conversions. The most active phases are iron nitrides with high mobility and solubility for nitrogen atoms, such as Fe3Nx. Phase changes from Fe3Nx to γ-FeNx were observed above 700°C. The formation of γ-FeNx seems to suppress the catalytic conversion. Moreover, the positive influence of a mesostructured support/catalyst composite on the catalytic conversion and catalyst stability were studied in detail.

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Language(s): eng - English
 Dates: 2018-03-092018-06-212018-10-09
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/cctc.201800398
 Degree: -

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Title: ChemCatChem
  Other : ChemCatChem
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 10 (19) Sequence Number: - Start / End Page: 4465 - 4472 Identifier: ISSN: 1867-3880
CoNE: https://pure.mpg.de/cone/journals/resource/1867-3880