The reactions of a potassium-containing bituminous coal briquette
and the correspondingcatalyst-free char with different NO/O
2 mixtures have been investigated at temperatures between300
and 325
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C. The isothermal reactions have been followed by two techniques: thermogravimetry
and gas chromatography + chemiluminescence analysis. A NO/NO
2 mixture rich in NO
2results in a high carbon loss compared to that corresponding to the mixture poor in NO
2. Despitethat, NO
x conversion is similar for both mixtures. The extra weight loss in the presence of a highconcentration of NO
2 is a consequence of NO
2 reduction by carbon, producing NO
and CO
2evolution.