PRODUCTION OF ELECTRONS FROM ALKALINE EARTHS IN FLAMES - EQUILIBRIUM AND KINETIC CONSIDERATIONS

被引:38
作者
JENSEN, DE
机构
[1] AeroChem Research Laboratories, Inc., Princeton, New Jersey
关键词
D O I
10.1016/0010-2180(68)90023-0
中图分类号
O414.1 [热力学];
学科分类号
摘要
Electron concentrations produced by calcium, strontium and barium in atmospheric-pressure hydrogen-nitrogen oxygen flames have been measured by the microwave cavity resonance method, and enthalpy changes and equilibrium constants obtained as follows: Ca + OH → CaOH+ + e- δH0= + 35± 10kcal/mole K 0= 1· × 10-3 exp(- 35000/RT)Sr + OH → SrOH+ + e- δH0= + 25± 8kcal/mole K 0= 2.0· × 10-3 exp(- 25000/RT)Ba + OH → BaOH+ + e- δH0= + 6± 10kcal/mole K 0= 1.7· × 10-3 exp(- 6000/RT). Discrepancies between Second Law and Third Law values of ΔH00 are interpreted as indicating kinetic limitations in the ionization reactions. The results would be consistent with upper limits to the pre-exponential factors in the rate constants for the above reactions of about 2 × 10-10 cm3 molecule-1 sec-1. © 1968.
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页码:261 / &
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