Abstract
The rate of evolution of CO 2 or CO was used to control the low temperature activation of carbon fibres in O 2 mixtures via a feedback loop operated by a PC and in-house software. The CO 2 or CO concentration was monitored by a mass spectrometer and its level kept constant by varying the O 2 concentration using mass flow controllers. Experiments were carried out at the same evolution rates for identical times at temperatures of 500–800 °C. It was found that the rate of carbon burn off was not constant and varied with the temperature, especially where the rate of CO 2 evolution was controlled. The proposed reason for this was the high temperature gas phase oxidation of CO. However, surface areas of up to 1500 m 2 g −1 were produced by these methods and thermal runaway was avoided.
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