Adverse effects of phosphate ions used as a stabilizing agent in rocket-grade hydrogen peroxide on the decomposition catalyst were investigated. For a comparative study, MnO 2 / Al 2 O 3 and MnO 2 + PbO / Al 2 O 3 were selected as the catalyst to decompose 90 wt% hydrogen peroxide containing 1.24 mg / liter of phosphate ions. The reactivity of the catalysts measured by reactivity tests decreased by half in the hydrogen peroxide, including phosphate ions. Endurance of the catalyst was evaluated on a 50 N monopropellant thruster by measuring the chamber pressure. The degradation of the decomposition efficiency of the catalyst was evident after the initial 5 s, during which the lead-doped catalyst revealed better performance than the pure MnO 2 catalyst. After 30 s of thruster operation, performance degradation was particularly severe with the lead-doped catalyst. The catalysts sampled after thruster operation were characterized by mass analysis, the Brunauer Emmet Teller model, and energy dispersive spectroscopy. A large quantity of phosphorus was detected on both catalysts tested with a high concentration of phosphate ions. The amount of phosphorus detected on the lead-doped catalyst was four times as large as the amount of phosphorus on the pure MnO 2 catalyst, indicating the affinity of lead and phosphate. The accumulation of phosphate on the catalyst surface inhibited the contact of hydrogen peroxide and the active material, preventing efficient decomposition.


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    Titel :

    Effect of Phosphate Stabilizers in Hydrogen Peroxide Decomposition on Manganese-Based Catalysts


    Beteiligte:
    Jang, Dongwook (Autor:in) / Kwon, Sejin (Autor:in) / Jo, Sungkwon (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2015-01-20


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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