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- W1558478860 abstract "Orbit and control attitude of satellites is carried out through the use of small engines based on catalytic decomposition of liquid hydrazine. Its replacement by less toxic and more outstanding propellants such as energetic ionic liquids is of current interest. Previous studies performed by our group have revealed that platinum supported on thermally stable-silicon doped alumina calcined at 1200°C, displays a good activity at low temperatures. The development of these catalysts requires the replacement of powdered samples by shape formed catalysts to limit the pressure drop under high flow rates. Spherical granules supports with an average diameter of 1.5 mm have been prepared using two procedures starting from the same sol-gel Si-doped boehmite: lab-designed oil drop process and industrial shape forming. Both shaped supports show high thermal stability at 1200 °C and close structural and textural properties related to the δ- and θ-alumina phases. The catalysts contain 10 wt.-% Pt and display good efficiency and similar catalytic activity for the decomposition of aqueous 79 wt.-% HAN solutions (hydroxylammonium nitrate NH3OH+NO3). Decomposition rates are higher for the oil-drop-based catalyst." @default.
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- W1558478860 date "2006-01-01" @default.
- W1558478860 modified "2023-09-26" @default.
- W1558478860 title "Shape forming of Pt/Al2O3Si sol-gel catalysts for space applications" @default.
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- W1558478860 doi "https://doi.org/10.1016/s0167-2991(06)81004-9" @default.
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