Inhibition mechanism between sodium (Na₃AlF₆) and sulfur on coke reactivity

Abstract

Inhibition mechanism between sodium (Na₃AlF₆) 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/CO₂ 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 “Na₂SO₃→ Na₂S→ Na₂CO₃→ Na₂SO₃” were likely the keys to producing this mutual inhibition.

Keywords

mutual inhibition / sulfur / sodium / coke reactivity

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