The Simultaneous Use of Mass Spectrometer and Microbalance Techniques for the Carbon-Oxygen System
The initial degassing of a high-surface-area graphite is characterized using mass spectrometric and thermogravimetric weight-loss measurements. It will be indicated how far the combination of these allied techniques can be used to define the graphitic nature of the material in terms of the extent of the basal and edge planes of the graphite crystallite. The active surface area of the graphite was measured by the formation of surface oxide during low-pressure oxygen chemisorption onto the clean surface of the material. By subsequent thermal desorption of surface oxide an additional value for the active surface area was obtained from the weight-loss data and the known ratios of the desorbed gaseous species CO and CO2. The utility of a mass spectrometer — microbalance system for the study of gas — surface reactions is discussed.
KeywordsSurface Oxide Active Surface Area Oxygen Chemisorption Edge Plane Mass Spectrometer System
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