Hydrogen ignition mechanism

Ignition Mechanism (4,7). Hydrogen, as we have already noted, ignites with a remarkably low ignition energy. It is also easily ignited with many other sources of energy, some of which are listed ... 

During the test, hydrogen flow rate was raised to a maximum of approximately 55 kg/s (120 Ib/s). About 23 seconds into the experiment, a reduction in flow rate began. Three seconds later, the hydrogen exploded. Electrostatic discharges and mechanical sparks were proposed as probable ignition sources. The explosion was preceded by a fire observed at the nozzle shortly after flow rate reduction began. The fire developed into a fireball of modest luminosity, and an explosion followed immediately. 

T). 3 5)-Aminopyrazole Note 5). (Caution Because hydrogen gas is evolved, this reaction should be conducted in an efficient hood in the absence of an ignition source.) A solution of sodium iso-propoxide is prepared from 18.4 g. (0.80 g. atom) of sodium and 500 ml. of isopropyl alcohol in a 2-1. four-necked flask fitted with a mechanical stirrer, a thermometer, a reflux condenser, and a... 

However, the complete reaction mechanism of the hydrogen oxidation reaction is much more complex, both in its number of reaction steps, number of intermediates (OOH and H2O2), and observed behavior. A mixture of H2 and O2 can sit in a diy bulb for many years with absolutely no H2O detected. However, if water is initially present, the reaction will begin, and if a spark is ignited or a grain of platinum is added to the mixture at room temperature, the reaction wiU occur instandy and explosively. 

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