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The direct synthesis of H2O2 from H2/O2 is increasing of interest with starting of operations for new large scale processes using H2O2 as reactant (synthesis of caprolactame and propene oxide) [1].One major problem in the direct synthesis of H2O2 derives from the need to operate with diluted H2 and O2 gaseous feeds to be outside the explosion range of the O2/H2/inert mixture, with the consequence of low productivities.The problem can be overcome using a new reactor design, eventually coupled to a microreactor technology, where the high ratio between the internal wall to volume, allows an efficient quenching of radical reactions and thus safe operations inside the explosion region.