Explosion Limits of Hydrogen/Oxygen Mixtures at Initial Pressures up to 200 bar

The exact experimental determination of the pressure dependence of the explosion limits of hydrogen/oxygen mixtures at 20 °C and 80 °C was investigated. The anomaly in the pressure dependence of hydrogen explosion limits (decrease of the upper explosion limit with increase in pressure), known for hydrogen/air mixtures, could be confirmed for hydrogen/oxygen mixtures. Furthermore it was shown that the impurities in the product gases of the electrolyzer did not exceed 50 % of the lower explosion level in any case.