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

Date
2022-02-25
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Source Title
Applied Catalysis A: General
Print ISSN
0926-860X
Electronic ISSN
1873-3875
Publisher
Elsevier
Volume
632
Issue
Pages
1 - 11
Language
English
Type
Article
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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.

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Keywords
ADN, Ammonium dinitramide, Catalytic decomposition, Hydrazine, Iridium, Monopropellant
Citation
Published Version (Please cite this version)