Abstract
A versatile partial-pressure mass spectrometer system is described for measuring gaseous species thermally desorbed from solid surfaces. The system evaluates not only the ratio of masses present in the gaseous phase but also the specific mass (mg/g of solid) desorbed or decomposed during thermal treatment. The extension of the method to oxidation studies is also described. A study has been made of the evolution of gases from graphitic and nongraphitic carbons. These range in properties from a non-graphitic carbon, a PVDC charcoal of molecular sieve type, through a ground graphite of specific surface 102 m 2/g to a nuclear type graphite of 0.6 m 2/g. The formation of surface oxide on a clean surface at pressures of the order 0.2 mm Hg is evaluated along with the subsequent thermal decomposition of the surface oxide. The data from this paper together with other published work on graphites is used to illustrate the application of the thermal-desorption results to oxidation studies on carbons and graphites.
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