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Synthesize and Investigation of the Catalytic Behavior of Ir/γ-Al2O3 Nanocatalyst

Hydrazine is an interesting reducing agent which is used in considerable number of different industrial catalytic applications including gas generators, pure hydrogen production for electric fuel cells and monopropellant thrusters. Hydrazine is a highly reactive molecule that decomposes at low temperature on many metal surfaces e. g. iridium, rhodium and tungsten. But the standard commercial catalyst used for decomposition of hydrazine is shell 405 which contents from high metallic content of iridium supported on gamma alumina. In the present study, iridium nanocatalysts based on gamma alumina with metallic content of 20 wt% have been synthesized by the incipient wetness impregnation using H2IrCl6.xH2O as precursor. The pretreatment effects on the metallic accessibility on the Ir/γ-Al2O3 have been evaluated. After ionic exchange, impregnated supports were calcined in air flow and the n followed by reduction in hydrogen flow. The prepared nanocatalyst has been identified using specific surface measurement (BET), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The catalytic mechanism was also briefly discussed. The main goal of this work is prepare, characterize, and determine the nanocatalytic behavior of iridium supported on gamma alumina in decomposition of hydrazine process. The results of this study show that the performance of synthesizes nanocatalyst is suitable for decomposition of hydrazine; however it is need of further investigation. The results indicate that however our synthesized nanocatalyst demonstrates a good job in hydrazine decomposition; some promoters had yet to be tested due to enhancement of economic efficiency.