The decomposition processes of alkali or alkaline earth carbonates with a large excess of carbon, and the reverse Boudouard reaction given by over metal carbonates, were compared. The carbonates of CO 2 /C ] 2CO Li`, Na`, K`, Cs`, Sr2`and Ba2`generated CO exclusively by an intermolecular redox reaction given byThe reverse Boudouard reaction over these metal carbonates at 700 ¡C proceeded CO 3 2~] C ] 2CO ] O2~. at a steady rate until just before the carbon was completely consumed, and in the cases of Li`, Sr2`and Ba2`, the rates agreed with the initial rates of the intermolecular redox reaction. On the other hand, the rates over the carbonates of Na`, K`and Cs`, the oxides of which undergo a disproportionation reaction to produce gas-phase metal and liquid-phase metal peroxide, were much higher than the initial rates of the intermolecular redox reaction. This discrepancy can be explained by the presence of a catalytic process on the metal-covered surface of the silica wool that was used for preventing the highly basic gas-phase metals from escaping.
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