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DOE OSTI2020

Materials Data on AlClO by Materials Project

AlOCl crystallizes in the orthorhombic Pmmn space group. The structure is two-dimensional and consists of one AlOCl sheet oriented in the (0, 0, 1) direction. Al3+ is bonded to four equivalent O2- and two equivalent Cl1- atoms to form a mixture of distorted edge and corner-sharing AlCl2O4 octahedra. The corner-sharing octahedral tilt angles are 27°. There is two shorter (1.88 Å) and two longer (2.00 Å) Al–O bond length. Both Al–Cl bond lengths are 2.31 Å. O2- is bonded to four equivalent Al3+ atoms to form a mixture of distorted edge and corner-sharing OAl4 tetrahedra. Cl1- is bonded in an L-shaped geometry to two equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗

NASA NTRS1976

High temperature reformation of aluminum and chlorine compounds behind the Mach disk of a solid-fuel rocket exhaust

Chemical reactions expected to occur among the constituents of solid-fuel rocket engine effluents in the hot region behind a Mach disk are analyzed theoretically. With the use of a rocket plume model that assumes the flow to be separated in the base region, and a chemical reaction scheme that includes evaporation of alumina and the associated reactions of 17 gas species, the reformation of the effluent is calculated. It is shown that AlClO and AlOH are produced in exchange for a corresponding reduction in the amounts of HCl and Al2O3. For the case of the space shuttle booster engines, up to 2% of the original mass of the rocket fuel can possibly be converted to these two new species and deposited in the atmosphere between the altitudes of 10 and 40 km. No adverse effects on the atmospheric environment are anticipated with the addition of these two new species.

Park, C.↗