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      Influence of La and Si promoters on the anaerobic heterogeneous catalytic decomposition of ammonium dinitramide (ADN) via alumina supported iridium active sites

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      Author(s)
      Kurt, Merve
      Kap, Zeynep
      Senol, Sinem
      Ercan, Kerem Emre
      Sika-Nartey, Abel Tetteh
      Kocak, Yusuf
      Koc, A.
      Esiyok, H.
      Caglayan, B. S.
      Aksoylu, A. E.
      Ozensoy, Emrah
      Date
      2022-02-25
      Source Title
      Applied Catalysis A: General
      Print ISSN
      0926-860X
      Electronic ISSN
      1873-3875
      Publisher
      Elsevier
      Volume
      632
      Pages
      1 - 11
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Structural origins of the promotional effects of the La or Si doping of alumina supported Ir catalysts in anaerobic ammonium dinitramide decomposition were investigated. Our findings reveal that Ir/Al2O3 and Ir/La-Al2O3 favorably lower the onset temperature of the ADN decomposition reaction, whereas Si doping boosts the pressure generation during the reaction. Formation of mostly metallic Ir nanoparticles for Ir/Al2O3 and Ir/La-Al2O3 enables the lowering of the activation energy of the reaction. On the other hand, enhancement due to Si promotion is associated to the generation of small oxidic Irnx+ clusters which are strongly interacting with the SiOx-AlOx surface domains of the support material. Fundamental structure-functionality relationships unraveled in the current work may allow design of novel catalytic systems for aerospace monopropellant propulsion systems with higher performance by simultaneous exploitation of Ir active sites with different electronic properties.
      Keywords
      ADN
      Ammonium dinitramide
      Catalytic decomposition
      Hydrazine
      Iridium
      Monopropellant
      Permalink
      http://hdl.handle.net/11693/111256
      Published Version (Please cite this version)
      https://dx.doi.org/10.1016/j.apcata.2022.118500
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      • Department of Chemistry 707
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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