Decomposition of hydrogen peroxide in aqueous solutions at elevated temperatures

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<jats:title>Abstract</jats:title><jats:p>Decomposition of hydrogen peroxide in high‐purity water has been measured at temperatures ranging 100 to 280°C in a laboratory test loop. A first‐order decomposition kinetics has been observed in all cases, but the decomposition rates were found to vary widely, depending on the material used in the reaction chamber. In a 4 mm ID stainless steel tubing, the decomposition rate constant is determined to be <jats:italic>k</jats:italic> = 2 × 10<jats:sup>5</jats:sup> exp(−14800/<jats:italic>RT</jats:italic>). This decomposition rate is approximately 100 times faster than that observed in a Teflon tubing.</jats:p><jats:p>The variation of decomposition rate in different reaction chambers is attributed to the heterogeneous catalytic effects. There is no evidence of reaction between H<jats:sub>2</jats:sub> and H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> in the highpurity water at temperatures up to 280°C.</jats:p>

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