Hydrazine decomposition over a supported iridium catalyst

摘要: Abstract Adsorption and desorption of hydrazine its decomposition products (H2, N2, NH3) on an indium alumina catalyst have been studied by temperature programmed ir spectroscopy in order to determine the mechanism nature active centers. Hydrogen is chemisorbed two types adsorption sites. Activation energies calculated for these sites they are 10.5 25 kcal mole−1. Sites lower energy attributed existence Ir-alumina complex higher bulk iridium. Nitrogen not adsorbed from gaseous phase between 700 °C. Ammonia metal at room temperature, begins 200 Desorption spectra, recorded after adsorbing decomposing hydrazine, show a new peak, which nitrogen remaining It corresponds activation 14 mole−1, it confirms that first step formation bond atoms molecule unfilled d orbitals metal. Apparently, 300 °K, carried out according reaction 3N2H4 → 4NH3 + N2. The spectra ammonia exhibit band 1220 cm−1, besides bands characteristic alumina; this could be attributable