Inhibition mechanism between sodium(Na_3AlF_6) and sulfur on coke reactivity was investigated by simulating petroleum coke with low-impurity pitch coke and by impurity doping. The mechanism was discussed by scanning electron microscopy, energy-dispersive spectrometry, and X-ray powder diffraction. Results show that Na effectively inhibited S catalysis during carbon–air/CO_2 reactions, and S inhibited the catalysis of Na during carbon– air reaction to a certain extent. A stable structure with a Na-to-S atomic ratio of 1.4 and a cyclic reaction system of "Na_2SO_3→ Na_2S→ Na_2CO_3→ Na_2SO_3" were likely the keys to producing this mutual inhibition.
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[1]School of Metallurgy and Environment, Central South University, Changsha 410083, China;
[2]National Engineering Laboratory of Efficient Utilization of Refractory Nonferrous Metal Resources （Central South University）, Changsha 410083, China;
