Accession Number : AD0698559

Title :   THERMODYNAMIC STUDIES IN METAL CONTAINING FLAMES,

Corporate Author : AEROCHEM RESEARCH LABS INC PRINCETON N J

Personal Author(s) : Jensen,D. E. ; Miller,W. J.

Report Date : OCT 1969

Pagination or Media Count : 29

Abstract : Several different experimental techniques (flame-ion mass spectrometry microwave cavity resonance, electrostatic probes and absorption spectrophotometry) were applied to fuel-rich atmospheric-pressure H2/O2/N2 flames seeded with potassium in order to determine the thermochemistry of ions produced from additives containing tungsten, boron or tin. Addition of tungsten results in reductions in concentrations of free potassium atoms and in formation of stable W-containing negative ions. The derived enthalpy changes imply electron affinities for WO3 and HWO4 of approximately 305 and 400 kj/mole, respectively. The reaction K + H2WO4 = KHWO4 + H is found to be exothermic. Comparison of the apparently rapidly established dissociative electron attachments to HBO2 and HCl provides a value for the electron affinity of BO2. Reactions leading to formation of BO(-) are discussed, and a lower limit for the electron affinity of BO of approximately 240 kj/mole is obtained. An examination of the positive ions produced by addition of tin compounds to these flames leads to a zero-point standard heat of formation for SnOH(+)(g). (Author)

Descriptors :   (*FLAMES, THERMOCHEMISTRY), (*THERMOCHEMISTRY, *FUEL ADDITIVES), (*TUNGSTEN COMPOUNDS, THERMOCHEMISTRY), (*BORON COMPOUNDS, THERMOCHEMISTRY), (*TIN COMPOUNDS, THERMOCHEMISTRY), IONIZATION, POTASSIUM, MASS SPECTROSCOPY

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE