The Heterogeneous Decomposition of Hydrazine. Part 6. Kinetics of the Decomposition on Supported Palladium and Platinum Catalysts.

摘要

The decomposition of hydrazine on either a palladium or a platinum catalyst may be represented by the reaction 2N2H4 to N2 +H2 + 2NH3. The observed one half order kinetics, changing to zero order with platinum, may be explained by deriving rate equations from the Langmuir adsorption isotherm and assuming that the initial, slow, step is the dissociative chemisorption of hydrazine in the form of NH2 radicals. In accordance with the dual plane theory of Cosser and Tompkins it is suggested that the adsorption process and subsequent reaction occur only on the active sites of these metals. Because these catalysts are much less active than a supported iridium catalyst neither is considered as an alternative for use in catalytic hydrazine thrusters.