Thermochemical reactions of aluminum and fluorine in hydrogenoxygen flames

✍ Scribed by Milton Farber; R.D. Srivastava

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 450 KB
• Volume: 27
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(76)90009-2

✦ Synopsis

The thermodynamic properties of reactions of aluminum and fluorine compounds in high temperature hydrogen-oxygen flames were determined employing a specially designed four-stage differentially pumped vacuum-mass spectrometer system. Investigation of the chemical equilibria involved established the reaction enthalpies for these high temperature stable species. The thermochemical reactions of the aluminum and fluorine species with the H~/O~ flame molecules produced the major species AIO, AIO=,, HALO, FAIO, HOAIO and AIF. The heats of formation at 298°K were 18.5 _+ 5,-41.6 -+ 5,-40.0 -+ 5,-90.0 -+ 5 and-135.0 -+ 5 kcal/mole for AIO(g), AIO.,(g), HAlO(g), HALO(g), HOAIO(g). and FAIO(g), respectively. The bond energy for AIO was found to be in agreement with those previously determined from thermochemical and spectroscopic studies. The investigation also disclosed that the energy of the OF bond is insufficient to form stable OF species in the flame, and that the major species involving fluorine and oxygen with aluminum is structured as F-AI = O.