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, and were selected as the catalyst to decompose 90 wt% hydrogen peroxide containing 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 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 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.
Effect of Phosphate Stabilizers in Hydrogen Peroxide Decomposition on Manganese-Based Catalysts
Journal of Propulsion and Power ; 31 , 3 ; 904-911
2015-01-20
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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