“…Bimetallic AuPd catalysts, known to offer high activity towards H 2 O 2 production, 13 have been widely studied for a range of oxidative transformations via in situ production of the oxidant, including for methane valorisation. [14][15][16][17][18][19] Recently, in an attempt to overcome reagent diffusion limitations and improve oxidant utilisation Jin et al investigated the modification of the external surface of a AuPd@ZSM-5 catalyst, with a hydrophobic organosilane layer, which was found to both promote the localised concentration of reagents near active sites and confine the synthesised H 2 O 2 near the AuPd nanoparticles for subsequent methane activation. 20 In contrast to the reaction mechanism proposed for CuFe-ZSM-5 materials 21 (another class of materials widely studied for methane oxidation when used in conjunction with H 2 O 2 ), AuPd catalysed methane oxidation using H 2 O 2 has been shown to proceed via the activation of the methane C-H bond through a hydrogen abstraction pathway, which is mediated by reactive oxygen species (ROS, ˙OOH, ˙OH and ˙O2 − ), which are generated from H 2 O 2 over AuPd surfaces, and the resulting formation of a methyl radical (˙CH 3 ).…”