Accession Number:

ADA149041

Title:

The Reaction of Oxygen-Nitrogen Mixtures with Granular Activated Carbons below the Spontaneous Ignition Temperature

Descriptive Note:

Corporate Author:

GEO-CENTERS INC NEWTON CENTRE MA

Personal Author(s):

Report Date:

1984-08-01

Pagination or Media Count:

28.0

Abstract:

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.

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE