The Reaction of Oxygen-Nitrogen Mixtures with Granular Activated Carbons below the Spontaneous Ignition Temperature
GEO-CENTERS INC NEWTON CENTRE MA
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The presence of oxygen in the carbon network of gas adsorbent charcoals presents a research problem of long standing. Four pertinent topics now concerned with the oxygen-charcoal reactions are a activation of the adsorbent charcoals manufacture, b regeneration processes applications, c the spontaneous ignition temperature safety considerations, and d the use of charcoals as catalyst carriers and impregnation supports. It is desirable to have a deeper knowledge of the initial surface composition of a charcoal that is to be used in a specific process. Thermal desorption behavior can supply such information. The results to be reported cover three characteristic temperature- dependent phenomena 1 an anomalous desorption in which a number of maxima occur in the concentrations of CO and CO2 2 the formation of a surface barrier causing a decay in the CO and CO2 concentrations with the first-order rate constants at constant temperature and 3 the attainment of a reproducible spontaneous ignition temperature SIT during programmed heating at a linear rate. These observations indicate a considerable complexity in the surface structure of an activated carbon.
- Organic Chemistry
- Physical Chemistry