H2O2 synthesis directly from H2 and O2

as a "green process" and "atomic-economic reaction"

is one of the most promising processes for replacing anthraquinone autoxidation process. In this paper

Pd/HAp (hydroxylapatite) catalyst was prepared by the conventional incipient-wetness impregnation method and highly dispersed Pd particles with an average size of 2.5 nm were obtained. Kinetic studies of H2O2 hydrogenation and direct synthesis of H2O2 were performed over a Pd/HAp catalyst and apparent activation energies and reaction orders with respect to H2 and O2 were calculated by power law functional models. Kinetic parameters indicated that the formation of H2O2 was favored at a lower reaction temperatures and higher O2 partial pressure

while higher H2 partial pressure would facilitate H2O formation.