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- W2278403951 abstract "Approximately 30 wt % of the exhaust emitted by the Space Shuttle`s solid-propellant rocket motors is composed of micron and submicron sized aluminum oxide particles. In order to assess the impact of these particles on stratospheric chemistry, we have investigated the reactions of several chlorofluorcarbons (CFCs) on {alpha}- and {gamma}-aluminum oxide powders at temperatures from 80-400 K. Using a combination of molecular beam dosing under UHV conditions, FTIR and X-ray photoelectron spectroscopy, and temperature programmed desorption (TPD), we conclude that CFCs dissociatively chemisorb on dehydroxylated alumina surfaces at temperatures as low as 130 K. A number of temperature-dependent absorption features are observed in the infrared spectra which can be attributed to carbonate species. TPD spectra indicate that CO{sub 2} desorbs from CFC-dosed alumina at temperatures below 370 K. X-ray photoelectron spectra reveal the presence of inorganic halides at temperatures as low As 150 K. The relative reactivities of the CFCs with alumina surfaces at stratospheric temperatures ({approximately}200 K) reflect differences in the initial sticking probabilities of the molecules and in the energetics of the dissociative chemisorption process." @default.
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- W2278403951 date "1996-10-01" @default.
- W2278403951 modified "2023-09-22" @default.
- W2278403951 title "Reactions of CFCs with aluminum oxide surfaces at stratospheric temperatures" @default.
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