Carbonaceous material with high micropore and low macropore volume and process for producing same
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United States of America Patent
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Dec 10, 1991
Grant Date -
N/A
app pub date -
May 25, 1990
filing date -
May 25, 1990
priority date (Note) -
Expired
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Abstract
A method which minimizes macropore formation while producing microporous carbon comprises a two stage process. Firstly, the carbon is heated to a temperature in the range of about 150.degree. to about 200.degree. C. in the presence of oxygen for a time in the range of about forty-five to about seventy-five minutes, then purging the reaction environment of oxygen at this temperature with nitrogen. In the second stage, the carbon is heated to a temperature in the range of about 750.degree. to about 900.degree. C. under a stream of nitrogen for a time in the range of about fifteen to forty-five minutes. The process is repeated a number of times, the number being dependent on the extent of microporosity desired.
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