Steam and CO2 gasification of Yallourn coal using iron alkali metal binary catalyst.

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Catalytic steam and CO2 gasification of Yallourn coal using ferric nitrate-alkali metal carbonate binary catalyst was carried out in a thermobalance at 700-800°C to investigate the binary effect of iron and alkali metal. The equimolar ferric nitrate-sodium carbonate binary catalyst showed synergistic catalytic effect for the steam gasification of the coal, while the binary catalyst showed additivity for the CO2 gasification. However, the binary catalyst exhibited poorer catalytic activity than the iron-sodium binary catalyst used in the form of sodium hydridotetracarbonylferrate for the steam gasification. Alkali metal (Na, K, Li) carbonates combined with ferric nitrate more highly promoted the steam gasification than the same amount of alkali metal carbonates. However, binary effects of ferric nitrate-alkali metal carbonates were not remarkable for the CO2 gasification. Activation of iron by alkali metal can tentatively be interpreted as follows: Iron which tends to be oxidized to higher oxidation state may be reduced by carbon in the char with the assist of alkali metal.
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