Kinetics of Hydrazine Decomposition on Iridium and Alumina Supported Iridium Catalysts
Final rept. Jul 1971-Jun 1973
AIR FORCE ROCKET PROPULSION LAB EDWARDS AFB CA
Pagination or Media Count:
The kinetics of heterogeneous hydrazine decomposition were determined over the temperature range of 460 to 700K for a polycrystalline iridium surface, and the temperature range of 350 to 450K for an alumina supported iridium catalyst. A change in reaction mechanism andor number of active catalytic sites was observed at approximately 450K for each catalyst. This is attributed to the irreversible, dissociate adsorption of hydrazine on a significant number of catalytic sites below 450K. Catalyst attrition mechanisms in monopropellant hydrazine engines are discussed in the light of this kinetic behavior. Recommendations are made concerning further elucidation of basic processes taking place in monopropellant engine cold starts.
- Physical Chemistry
- Rocket Propellants