The oxidation behavior of A3-3 matrix graphite

Publication date: April 2016 Source:New Carbon Materials, Volume 31, Issue 2 Author(s): Xiang-wen Zhou, Zhen-ming Lu, Xin-nan Li, Jie Zhang, Bing Liu, Ya-ping Tang The effects of temperature on the oxidation behavior of the A3-3 matrix graphite (MG) in the temperature range 798-973 K in air with a flow rate of 100 ml/min to burn-offs of 10-15 wt%, were investigated by a home-made thermo-gravimetric experimental setup. The oxidation rate (OR) increases significantly with the temperature. The OR at 973 K is over 70 times faster than at 798 K. The oxidation kinetics of A3-3 MG in air at temperatures up to 973 K is in the reaction control regime, where the activation energy is 176 kJ/mol and the Arrhenius equation could be described as: OR=2.9673×108·exp(-21124.8/T) wt%/min. The relatively lower activation energy of MG than that of structural nuclear graphite indicates that MG is more easily oxidized.

Source: New Carbon Materials - May 16, 2016 Category: Chemistry Source Type: research